{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T04:57:01Z","timestamp":1790830621102,"version":"4.1.0"},"reference-count":113,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T00:00:00Z","timestamp":1790380800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Ultrasound-assisted metal additive manufacturing (U-FAAM) has emerged as a promising in situ melt-pool regulation strategy for addressing the challenges of conventional metal additive manufacturing, including process instability, defect formation, and microstructural anisotropy. This review systematically summarizes recent progress in contact and non-contact ultrasound-assisted metal additive manufacturing from the perspective of acoustic energy delivery pathways. The interactions between ultrasonic excitation and melt-pool behavior, thermal transport, solidification-front evolution, defect formation, microstructural transformation, and mechanical performance are comprehensively discussed. Contact ultrasound approaches transmit acoustic energy through solid media. Cavitation can occur only when the melt-side acoustic pressure reaches the required threshold; under such conditions, cavitation-associated effects may act with acoustic streaming and inertial melt flow to enhance mixing, grain refinement, and defect mitigation. Non-contact ultrasound approaches provide improved geometric adaptability and mainly influence melt-pool evolution through acoustic streaming and cyclic pressure fluctuations. The relationships among ultrasonic input conditions, melt-side responses, solidification behavior, and final properties are critically analyzed. Furthermore, current limitations associated with acoustic energy attenuation, coupling efficiency, process scalability, and quantitative characterization of ultrasonic effects within the melt pool are highlighted. This review synthesizes current evidence for ultrasound-driven melt-pool control in the investigated fusion-based AM systems, particularly DED\/LDED and WAAM, while recognizing the limited evidence for LPBF.<\/jats:p>","DOI":"10.3390\/ma19194120","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T12:46:29Z","timestamp":1790599589000},"page":"4120","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Contact and Non-Contact Ultrasound-Assisted Metal Additive Manufacturing: Recent Progress in Melt-Pool Control"],"prefix":"10.3390","volume":"19","author":[{"given":"Nuo","family":"Xu","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Yuan","sequence":"additional","affiliation":[{"name":"Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5597-9111","authenticated-orcid":false,"given":"Zhong","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Materials and Energy, Foshan University, Foshan 528000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenting","family":"Ouyang","sequence":"additional","affiliation":[{"name":"Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bowen","family":"Gong","sequence":"additional","affiliation":[{"name":"Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5257-2500","authenticated-orcid":false,"given":"Likun","family":"Wang","sequence":"additional","affiliation":[{"name":"Ningbo Global Innovation Center, Zhejiang University, Ningbo 315100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sainan","family":"Ma","sequence":"additional","affiliation":[{"name":"Ningbo Global Innovation Center, Zhejiang University, Ningbo 315100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhanxing","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinfang","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiuwei","family":"Xing","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4147-7070","authenticated-orcid":false,"given":"Xiang","family":"Gao","sequence":"additional","affiliation":[{"name":"Ningbo Global Innovation Center, Zhejiang University, Ningbo 315100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.pmatsci.2017.10.001","article-title":"Additive manufacturing of metallic components\u2014Process, structure and properties","volume":"92","author":"DebRoy","year":"2018","journal-title":"Prog. Mater. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1917","DOI":"10.1007\/s11665-014-0958-z","article-title":"Metal additive manufacturing: A review","volume":"23","author":"Frazier","year":"2014","journal-title":"J. Mater. Eng. Perform."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1179\/1743280411Y.0000000014","article-title":"Laser additive manufacturing of metallic components: Materials, processes and mechanisms","volume":"57","author":"Gu","year":"2012","journal-title":"Int. Mater. Rev."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1016\/j.actamat.2016.07.019","article-title":"Additive manufacturing of metals","volume":"117","author":"Herzog","year":"2016","journal-title":"Acta Mater."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1016\/j.mattod.2021.03.020","article-title":"Directed energy deposition (DED) additive manufacturing: Physical characteristics, defects, challenges and applications","volume":"49","author":"Svetlizky","year":"2021","journal-title":"Mater. Today"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.actamat.2016.02.014","article-title":"Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones","volume":"108","author":"Khairallah","year":"2016","journal-title":"Acta Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1146\/annurev-matsci-070115-032024","article-title":"Metal additive manufacturing: A review of mechanical properties","volume":"46","author":"Lewandowski","year":"2016","journal-title":"Annu. Rev. Mater. Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1080\/09506608.2015.1116649","article-title":"The metallurgy and processing science of metal additive manufacturing","volume":"61","author":"Sames","year":"2016","journal-title":"Int. Mater. Rev."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"044005","DOI":"10.1088\/1361-6501\/aa5c4f","article-title":"Process defects and in situ monitoring methods in metal powder bed fusion: A review","volume":"28","author":"Grasso","year":"2017","journal-title":"Meas. Sci. Technol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1355","DOI":"10.1038\/s41467-018-03734-7","article-title":"In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing","volume":"9","author":"Leung","year":"2018","journal-title":"Nat. Commun."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"3602","DOI":"10.1038\/s41598-017-03761-2","article-title":"Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging and diffraction","volume":"7","author":"Zhao","year":"2017","journal-title":"Sci. Rep."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"849","DOI":"10.1126\/science.aav4687","article-title":"Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed X-ray imaging","volume":"363","author":"Cunningham","year":"2019","journal-title":"Science"},{"key":"ref_13","first-page":"548","article-title":"Melt-pool temperature and cooling rates in laser powder bed fusion","volume":"22","author":"Hooper","year":"2018","journal-title":"Addit. Manuf."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1987","DOI":"10.1038\/s41467-019-10009-2","article-title":"Dynamics of pore formation during laser powder bed fusion additive manufacturing","volume":"10","author":"Martin","year":"2019","journal-title":"Nat. Commun."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3088","DOI":"10.1038\/s41467-019-10973-9","article-title":"Pore elimination mechanisms during 3D printing of metals","volume":"10","author":"Hojjatzadeh","year":"2019","journal-title":"Nat. Commun."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1170","DOI":"10.1038\/s41467-022-28694-x","article-title":"Keyhole fluctuation and pore formation mechanisms during laser powder bed fusion additive manufacturing","volume":"13","author":"Huang","year":"2022","journal-title":"Nat. Commun."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"3303","DOI":"10.1016\/j.actamat.2010.02.004","article-title":"A study of the microstructural evolution during selective laser melting of Ti\u20136Al\u20134V","volume":"58","author":"Thijs","year":"2010","journal-title":"Acta Mater."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"3190","DOI":"10.1007\/s11661-011-0731-y","article-title":"As-fabricated and heat-treated microstructures of the Ti-6Al-4V alloy processed by selective laser melting","volume":"42","author":"Vilaro","year":"2011","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2028","DOI":"10.1557\/jmr.2014.166","article-title":"The formation of \u03b1 + \u03b2 microstructure in as-fabricated selective laser melting of Ti\u20136Al\u20134V","volume":"29","author":"Simonelli","year":"2014","journal-title":"J. Mater. Res."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1861","DOI":"10.1007\/s11661-004-0094-8","article-title":"Microstructural evolution in laser-deposited multilayer Ti-6Al-4V builds: Part I. Microstructural characterization","volume":"35","author":"Kelly","year":"2004","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1016\/j.msea.2014.12.018","article-title":"Hardened austenite steel with columnar sub-grain structure formed by laser melting","volume":"625","author":"Saeidi","year":"2015","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"771","DOI":"10.1016\/j.promfg.2017.07.074","article-title":"Ultrasonic vibration-assisted laser engineered net shaping of Inconel 718 parts: A feasibility study","volume":"10","author":"Ning","year":"2017","journal-title":"Procedia Manuf."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"116395","DOI":"10.1016\/j.jmatprotec.2019.116395","article-title":"Ultrasonic vibration-assisted laser engineered net shaping of Inconel 718 parts: Effects of ultrasonic frequency on microstructural and mechanical properties","volume":"276","author":"Wang","year":"2020","journal-title":"J. Mater. Process. Technol."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"147676","DOI":"10.1016\/j.msea.2024.147676","article-title":"Ultrasonic vibration-assisted laser-directed energy deposition of high-strength AlMgScZr alloy: Microstructural transformation and strength enhancement","volume":"923","author":"Ma","year":"2025","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1038\/nature23894","article-title":"3D printing of high-strength aluminum alloys","volume":"549","author":"Martin","year":"2017","journal-title":"Nature"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"4341","DOI":"10.1007\/s11661-020-05880-4","article-title":"Grain refinement of alloys in fusion-based additive manufacturing processes","volume":"51","author":"Zhang","year":"2020","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1765","DOI":"10.2355\/isijinternational.45.1765","article-title":"High power ultrasonics in pyrometallurgy: Current status and recent development","volume":"45","author":"Komarov","year":"2005","journal-title":"ISIJ Int."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1016\/j.ultsonch.2018.12.028","article-title":"Fundamental studies of ultrasonic melt processing","volume":"52","author":"Eskin","year":"2019","journal-title":"Ultrason. Sonochem."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"106151","DOI":"10.1016\/j.ultsonch.2022.106151","article-title":"An overview and critical assessment of the mechanisms of microstructural refinement during ultrasonic solidification of metals","volume":"89","author":"Balasubramani","year":"2022","journal-title":"Ultrason. Sonochem."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1038\/s41467-019-13874-z","article-title":"Grain structure control during metal 3D printing by high-intensity ultrasound","volume":"11","author":"Todaro","year":"2020","journal-title":"Nat. Commun."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"105789","DOI":"10.1016\/j.icheatmasstransfer.2021.105789","article-title":"Influence of ultrasonic vibration on molten pool behavior and deposition layer forming morphology for wire and arc additive manufacturing","volume":"130","author":"Ji","year":"2022","journal-title":"Int. Commun. Heat Mass Transf."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"115147","DOI":"10.1016\/j.matdes.2025.115147","article-title":"Part-agnostic ultrasonic melt-pool vibration in wire-laser directed energy deposition","volume":"260","author":"Hamilton","year":"2025","journal-title":"Mater. Des."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"7613","DOI":"10.1038\/s41467-025-62803-w","article-title":"Non-contact ultrasound to assist laser additive manufacturing","volume":"16","author":"Han","year":"2025","journal-title":"Nat. Commun."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"10395","DOI":"10.1016\/j.jmrt.2025.05.250","article-title":"Investigation on non-contact ultrasonic-assisted laser directed energy deposition of 316 austenitic stainless steel","volume":"36","author":"Zhang","year":"2025","journal-title":"J. Mater. Res. Technol."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Zhang, W., Xu, C., Li, C., and Wu, S. (2024). Advances in ultrasonic-assisted directed energy deposition (DED) for metal additive manufacturing. Crystals, 14.","DOI":"10.3390\/cryst14020114"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"107070","DOI":"10.1016\/j.ultsonch.2024.107070","article-title":"Ultrasonic field-assisted metal additive manufacturing (U-FAAM): Mechanisms, research and future directions","volume":"111","author":"Li","year":"2024","journal-title":"Ultrason. Sonochem."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Dass, A., and Moridi, A. (2019). State of the art in directed energy deposition: From additive manufacturing to materials design. Coatings, 9.","DOI":"10.3390\/coatings9070418"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"188201","DOI":"10.1016\/j.jallcom.2026.188201","article-title":"Research progress on the regulation of molten pool dynamics, microstructure and properties of ultrasonic field assisted laser additive manufacturing","volume":"1065","author":"Wang","year":"2026","journal-title":"J. Alloys Compd."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Cao, Y., Zhang, Y., Ming, W., He, W., and Ma, J. (2023). Review: The metal additive-manufacturing technology of the ultrasonic-assisted wire-and-arc additive manufacturing process. Metals, 13.","DOI":"10.3390\/met13020398"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"e202501744","DOI":"10.1002\/adem.202501744","article-title":"Ultrasonic-driven and ultrasonic-assisted additive manufacturing: Processes, mechanisms, and perspective","volume":"28","author":"Li","year":"2025","journal-title":"Adv. Eng. Mater."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"641","DOI":"10.1179\/1743284715Y.0000000073","article-title":"Wire + arc additive manufacturing","volume":"32","author":"Williams","year":"2016","journal-title":"Mater. Sci. Technol."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"\u00d6zel, T., Shokri, H., and Loizeau, R. (2023). A review on wire-fed directed energy deposition based metal additive manufacturing. J. Manuf. Mater. Process., 7.","DOI":"10.3390\/jmmp7010045"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"041304","DOI":"10.1063\/1.4937809","article-title":"Laser powder bed fusion additive manufacturing of metals: Physics, computational, and materials challenges","volume":"2","author":"King","year":"2015","journal-title":"Appl. Phys. Rev."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"168771","DOI":"10.1016\/j.jallcom.2023.168771","article-title":"Microstructure and mechanical properties of GH5188 superalloy additively manufactured via ultrasonic-assisted laser powder bed fusion","volume":"939","author":"Yan","year":"2023","journal-title":"J. Alloys Compd."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"737","DOI":"10.1016\/j.cirp.2016.05.004","article-title":"Design for additive manufacturing: Trends, opportunities, considerations, and constraints","volume":"65","author":"Thompson","year":"2016","journal-title":"CIRP Ann."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"108762","DOI":"10.1016\/j.matdes.2020.108762","article-title":"Processing parameters in laser powder bed fusion metal additive manufacturing","volume":"193","author":"Oliveira","year":"2020","journal-title":"Mater. Des."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1007\/s00170-015-7576-2","article-title":"Additive manufacturing methods and modeling approaches: A critical review","volume":"83","author":"Bikas","year":"2016","journal-title":"Int. J. Adv. Manuf. Technol."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1007\/s00170-015-7077-3","article-title":"Wire-feed additive manufacturing of metal components: Technologies, developments and future interests","volume":"81","author":"Ding","year":"2015","journal-title":"Int. J. Adv. Manuf. Technol."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"17705","DOI":"10.1038\/s41598-023-44108-4","article-title":"In situ observation of melt-pool evolution in ultrasonic vibration-assisted directed energy deposition","volume":"13","author":"Zhang","year":"2023","journal-title":"Sci. Rep."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"e2289465","DOI":"10.1080\/17452759.2023.2289465","article-title":"Grain refinement of NiTi alloys during ultrasound-assisted wire-arc directed energy deposition","volume":"19","author":"Zhang","year":"2024","journal-title":"Virtual Phys. Prototyp."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"e2301482","DOI":"10.1080\/17452759.2023.2301482","article-title":"Microstructure and property enhancement of 7075 aluminium alloy via laser metal deposition augmented by in-situ ultrasonic vibration","volume":"19","author":"Su","year":"2024","journal-title":"Virtual Phys. Prototyp."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"138600","DOI":"10.1016\/j.matlet.2025.138600","article-title":"Effects of ultrasonic vibration on mechanical properties and microstructure evolution of Ti-6Al-4V alloy manufactured by laser direct energy deposition","volume":"393","author":"Guo","year":"2025","journal-title":"Mater. Lett."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/j.ijmachtools.2017.04.008","article-title":"A fundamental investigation on ultrasonic vibration-assisted laser engineered net shaping of stainless steel","volume":"121","author":"Cong","year":"2017","journal-title":"Int. J. Mach. Tools Manuf."},{"key":"ref_54","first-page":"101632","article-title":"Grain refinement of stainless steel in ultrasound-assisted additive manufacturing","volume":"37","author":"Todaro","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"021416","DOI":"10.1063\/5.0082461","article-title":"Manipulating molten pool dynamics during metal 3D printing by ultrasound","volume":"9","author":"Yang","year":"2022","journal-title":"Appl. Phys. Rev."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"106724","DOI":"10.1016\/j.icheatmasstransfer.2023.106724","article-title":"Grain refinement and mechanism of steel in ultrasound assisted wire and arc additive manufacturing","volume":"143","author":"Ji","year":"2023","journal-title":"Int. Commun. Heat Mass Transf."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1016\/j.ultsonch.2016.01.017","article-title":"Synchrotron quantification of ultrasound cavitation and bubble dynamics in Al-10Cu melts","volume":"31","author":"Xu","year":"2016","journal-title":"Ultrason. Sonochem."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"505","DOI":"10.1016\/j.actamat.2017.10.067","article-title":"Ultrafast synchrotron X-ray imaging studies of microstructure fragmentation in solidification under ultrasound","volume":"144","author":"Wang","year":"2018","journal-title":"Acta Mater."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1016\/j.jmapro.2020.10.058","article-title":"Ultrasonic vibration-assisted laser directed energy deposition in situ synthesis of NiTi alloys: Effects on microstructure and mechanical properties","volume":"60","author":"Zhang","year":"2020","journal-title":"J. Manuf. Process."},{"key":"ref_60","doi-asserted-by":"crossref","unstructured":"Peng, B., Zhang, M., Zhang, X., Chai, Z., Ba, F., and Chen, X. (2026). Tailoring the microstructure and mechanical properties of laser directed energy-deposited Inconel 718 alloys via ultrasonic frequency modulation. Crystals, 16.","DOI":"10.3390\/cryst16010072"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"105472","DOI":"10.1016\/j.ultsonch.2021.105472","article-title":"Grain refining of Ti-6Al-4V alloy fabricated by laser and wire additive manufacturing assisted with ultrasonic vibration","volume":"73","author":"Yuan","year":"2021","journal-title":"Ultrason. Sonochem."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"147168","DOI":"10.1016\/j.msea.2024.147168","article-title":"Ultrasonic vibration assisted directed energy deposition of titanium alloy: Microstructure control, strengthening mechanisms and fatigue crack behavior","volume":"914","author":"Wang","year":"2024","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_63","first-page":"102462","article-title":"Effects of ultrasound on multilayer forming mechanism of Inconel 718 in directed energy deposition","volume":"48","author":"Yang","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"107124","DOI":"10.1016\/j.ultsonch.2024.107124","article-title":"Effect of ultrasonic vibrations on mass efficiency and microstructure of laser direct deposition Inconel 718 superalloy","volume":"111","author":"Zohourmesgar","year":"2024","journal-title":"Ultrason. Sonochem."},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"2381","DOI":"10.1007\/s10853-023-08155-6","article-title":"Improving microstructure and mechanical properties of thin-wall part fabricated by wire arc additive manufacturing assisted with high-intensity ultrasound","volume":"58","author":"Ji","year":"2023","journal-title":"J. Mater. Sci."},{"key":"ref_66","doi-asserted-by":"crossref","unstructured":"Niu, F., Li, Y., Song, C., Yan, X., Zhang, Z., Ma, G., and Wu, D. (2022). Microstructure and wear resistance of TiCp\/Ti6Al4V composite coatings by follow-up ultrasonic-assisted laser additive manufacturing. Coatings, 12.","DOI":"10.3390\/coatings12070986"},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"109736","DOI":"10.1016\/j.compositesb.2022.109736","article-title":"Intermetallic regulation mechanism of Inconel 718\/Ti6Al4V composite by novel follow-up ultrasonic assisted laser additive manufacturing","volume":"235","author":"Wu","year":"2022","journal-title":"Compos. Part B Eng."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"548","DOI":"10.1016\/j.jmrt.2025.09.142","article-title":"Printability and grain refinement in stainless steel processed by non-contact ultrasound-assisted additive manufacturing","volume":"39","author":"Han","year":"2025","journal-title":"J. Mater. Res. Technol."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"109865","DOI":"10.1016\/j.mtcomm.2024.109865","article-title":"Non-contact ultrasonic vibration-assisted laser metal deposition manufacturing Fe-based powder: Numerical simulation and experimental investigation","volume":"40","author":"Li","year":"2024","journal-title":"Mater. Today Commun."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"111053","DOI":"10.1016\/j.optlastec.2024.111053","article-title":"Effect of ultrasonic parameters on microstructure and mechanical properties of non-contact ultrasonic-assisted laser metal deposition of Fe-based powder","volume":"176","author":"Li","year":"2024","journal-title":"Opt. Laser Technol."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"111747","DOI":"10.1016\/j.optlastec.2024.111747","article-title":"Effect of ultrasonic-assisted laser metal deposition on microcracks in deposition layer","volume":"181","author":"Li","year":"2025","journal-title":"Opt. Laser Technol."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1016\/j.actamat.2017.09.051","article-title":"Fluid and particle dynamics in laser powder bed fusion","volume":"142","author":"Bidare","year":"2018","journal-title":"Acta Mater."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"110259","DOI":"10.1016\/j.ijmecsci.2025.110259","article-title":"Particle motion control in ultrasonic assisted directed energy deposition","volume":"294","author":"Zhang","year":"2025","journal-title":"Int. J. Mech. Sci."},{"key":"ref_74","first-page":"178","article-title":"Modeling of heat transfer, fluid flow and solidification microstructure of nickel-base superalloy fabricated by laser powder bed fusion","volume":"12","author":"Lee","year":"2016","journal-title":"Addit. Manuf."},{"key":"ref_75","doi-asserted-by":"crossref","unstructured":"Kabir, S., Kaushik, H.C., Ansary, S.R., Grandhi, M., Kono, D., and Cong, W. (2026). Layer to layer molten pool thermal behavior in laser directed energy deposition influenced by ultrasonic vibration. Prog. Addit. Manuf.","DOI":"10.1007\/s40964-026-01810-9"},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"104907","DOI":"10.1016\/j.rineng.2025.104907","article-title":"Molten material movement trajectories and geometries in the ultrasonic vibration-assisted laser directed energy deposition","volume":"26","author":"Kabir","year":"2025","journal-title":"Results Eng."},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"2643","DOI":"10.1007\/s40964-025-01487-6","article-title":"Ultrasonic vibration-assisted laser directed energy deposition: Effects on material movement in vertical and horizontal direction","volume":"11","author":"Kabir","year":"2026","journal-title":"Prog. Addit. Manuf."},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"108166","DOI":"10.1016\/j.ultras.2026.108166","article-title":"Ultrasonic vibration-assisted laser directed energy deposition: Influence of vibration frequencies on thermal and mechanical characteristics","volume":"167","author":"Kabir","year":"2026","journal-title":"Ultrasonics"},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"012025","DOI":"10.2351\/7.0001915","article-title":"Processing of a Steel-to-Copper Multi-material through Build-plate Preheating and Ultrasonic Assisted Laser-based Directed Energy Deposition","volume":"38","author":"Hinderdael","year":"2026","journal-title":"J. Laser Appl."},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1016\/j.commatsci.2016.10.003","article-title":"An improved prediction of residual stresses and distortion in additive manufacturing","volume":"126","author":"Mukherjee","year":"2017","journal-title":"Comput. Mater. Sci."},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"118134","DOI":"10.1016\/j.jmatprotec.2023.118134","article-title":"Wire-arc directed energy deposited Mg-Al alloy assisted by ultrasonic vibration: Improving properties via controlling grain structures","volume":"321","author":"Yi","year":"2023","journal-title":"J. Mater. Process. Technol."},{"key":"ref_82","doi-asserted-by":"crossref","first-page":"111454","DOI":"10.1016\/j.optlastec.2024.111454","article-title":"Evolution and elimination of pore in molten pool during directed energy deposition assisted by ultrasonic vibration","volume":"180","author":"Liu","year":"2025","journal-title":"Opt. Laser Technol."},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"142971","DOI":"10.1016\/j.msea.2022.142971","article-title":"The dynamic recrystallization mechanism of ultrasonic power on non-contact ultrasonic-assisted direct laser deposited alloy steel","volume":"840","author":"Zhou","year":"2022","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_84","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1038\/s41524-022-00699-6","article-title":"Mechanism of keyhole pore formation in metal additive manufacturing","volume":"8","author":"Wang","year":"2022","journal-title":"npj Comput. Mater."},{"key":"ref_85","first-page":"77","article-title":"Reducing porosity in AlSi10Mg parts processed by selective laser melting","volume":"1\u20134","author":"Aboulkhair","year":"2014","journal-title":"Addit. Manuf."},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"294","DOI":"10.1016\/j.actamat.2018.12.027","article-title":"The effect of powder oxidation on defect formation in laser additive manufacturing","volume":"166","author":"Leung","year":"2019","journal-title":"Acta Mater."},{"key":"ref_87","doi-asserted-by":"crossref","first-page":"386","DOI":"10.1080\/21663831.2017.1299808","article-title":"Is the energy density a reliable parameter for materials synthesis by selective laser melting?","volume":"5","author":"Prashanth","year":"2017","journal-title":"Mater. Res. Lett."},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"4085","DOI":"10.1038\/s41598-017-04237-z","article-title":"Metal vapor micro-jet controls material redistribution in laser powder bed fusion additive manufacturing","volume":"7","author":"Ly","year":"2017","journal-title":"Sci. Rep."},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1016\/j.jmst.2023.09.021","article-title":"Enhanced strength-ductility synergy of magnesium alloy fabricated by ultrasound assisted directed energy deposition","volume":"178","author":"Li","year":"2024","journal-title":"J. Mater. Sci. Technol."},{"key":"ref_90","first-page":"102617","article-title":"The effects of ultrasonic frequency pulsed arc on wire + arc additively manufactured high strength aluminum alloys","volume":"51","author":"Cong","year":"2022","journal-title":"Addit. Manuf."},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1016\/j.procir.2022.09.107","article-title":"Ultrasonic-Assisted Laser Metal Deposition (LMD) of Steel 316L","volume":"113","author":"Rabiey","year":"2022","journal-title":"Procedia CIRP"},{"key":"ref_92","first-page":"56","article-title":"Equiaxed microstructure formation by ultrasonic assisted laser metal deposition","volume":"31","author":"Yao","year":"2022","journal-title":"Manuf. Lett."},{"key":"ref_93","doi-asserted-by":"crossref","first-page":"107090","DOI":"10.1016\/j.ultras.2023.107090","article-title":"Effect of ultrasonic intensity on microstructure and mechanical properties of steel alloy in direct energy deposition-Arc","volume":"134","author":"Ji","year":"2023","journal-title":"Ultrasonics"},{"key":"ref_94","doi-asserted-by":"crossref","unstructured":"Masaylo, D., Igoshin, S., Popovich, A., Orlov, A., Kim, A., and Popovich, V. (2022). Microstructural and Hardness Behavior of H13 Tool Steel Manufactured by Ultrasound-Assisted Laser-Directed Energy Deposition. Metals, 12.","DOI":"10.3390\/met12030450"},{"key":"ref_95","doi-asserted-by":"crossref","first-page":"141177","DOI":"10.1016\/j.msea.2021.141177","article-title":"Improvement of the grain structure and mechanical properties of austenitic stainless steel fabricated by laser and wire additive manufacturing assisted with ultrasonic vibration","volume":"813","author":"Yuan","year":"2021","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_96","doi-asserted-by":"crossref","first-page":"118269","DOI":"10.1016\/j.jmatprotec.2023.118269","article-title":"Multi-regional microstructure control using ultrasonic-assisted directed energy deposition for Al-Cu alloy","volume":"324","author":"Zhan","year":"2024","journal-title":"J. Mater. Process. Technol."},{"key":"ref_97","doi-asserted-by":"crossref","first-page":"115673","DOI":"10.1016\/j.scriptamat.2023.115673","article-title":"Improving mechanical properties and isotropy of laser DED 17-4 PH stainless steel by combining ultrasonic vibration","volume":"236","author":"Yu","year":"2023","journal-title":"Scr. Mater."},{"key":"ref_98","doi-asserted-by":"crossref","first-page":"1869","DOI":"10.1007\/s11661-004-0095-7","article-title":"Microstructural evolution in laser-deposited multilayer Ti-6Al-4V builds: Part II. Thermal modeling","volume":"35","author":"Kelly","year":"2004","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_99","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1016\/j.jallcom.2012.07.022","article-title":"Heat treatment of Ti6Al4V produced by selective laser melting: Microstructure and mechanical properties","volume":"541","author":"Vrancken","year":"2012","journal-title":"J. Alloys Compd."},{"key":"ref_100","doi-asserted-by":"crossref","first-page":"370","DOI":"10.1016\/j.matdes.2015.12.171","article-title":"Alloying effect of titanium on WCp\/Al composite fabricated by coincident wire-powder laser deposition","volume":"93","author":"Li","year":"2016","journal-title":"Mater. Des."},{"key":"ref_101","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/j.jmapro.2023.08.006","article-title":"Wire-arc directed energy deposition super martensitic stainless steel with excellent strength and plasticity","volume":"103","author":"Tian","year":"2023","journal-title":"J. Manuf. Process."},{"key":"ref_102","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1038\/nmat5021","article-title":"Additively manufactured hierarchical stainless steels with high strength and ductility","volume":"17","author":"Wang","year":"2018","journal-title":"Nat. Mater."},{"key":"ref_103","doi-asserted-by":"crossref","first-page":"8563","DOI":"10.1016\/j.jmrt.2024.05.229","article-title":"Grain refinement and Laves phase dispersion by high-intensity ultrasonic vibration in laser cladding of Inconel 718","volume":"30","author":"Chen","year":"2024","journal-title":"J. Mater. Res. Technol."},{"key":"ref_104","doi-asserted-by":"crossref","first-page":"110393","DOI":"10.1016\/j.matdes.2022.110393","article-title":"Ultrasonic effects on gas tungsten arc based wire additive manufacturing of aluminum matrix nanocomposite","volume":"214","author":"Wang","year":"2022","journal-title":"Mater. Des."},{"key":"ref_105","doi-asserted-by":"crossref","unstructured":"Peng, B., Zhang, X., Zhang, M., Chai, Z., Ba, F., and Chen, X. (2025). Microstructure and mechanical property of thin-walled Inconel 718 parts fabricated by ultrasonic-assisted laser-directed energy deposition. Crystals, 15.","DOI":"10.3390\/cryst15090815"},{"key":"ref_106","doi-asserted-by":"crossref","first-page":"112349","DOI":"10.1016\/j.tws.2024.112349","article-title":"Microstructure and mechanical properties of GH4169 thin-walled parts fabricated by ultrasonic vibration assisted laser directed energy deposition\/milling hybrid process","volume":"205","author":"Zhou","year":"2024","journal-title":"Thin-Walled Struct."},{"key":"ref_107","doi-asserted-by":"crossref","first-page":"147898","DOI":"10.1016\/j.msea.2025.147898","article-title":"Regulating microstructure and mechanical properties of additively manufactured Inconel 718 alloy via dual-dimensional ultrasonic vibration strategies","volume":"927","author":"Fan","year":"2025","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_108","doi-asserted-by":"crossref","first-page":"760","DOI":"10.1007\/s11771-025-5924-4","article-title":"Improved microstructure and mechanical properties of A517Q steel fabricated via laser directed energy deposition assisted by ultrasonic vibration combined with tempering treatment","volume":"32","author":"Li","year":"2025","journal-title":"J. Cent. South Univ."},{"key":"ref_109","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/j.matlet.2016.05.055","article-title":"Microstructures and mechanical properties of Fe-Cr stainless steel parts fabricated by ultrasonic vibration-assisted laser engineered net shaping process","volume":"179","author":"Ning","year":"2016","journal-title":"Mater. Lett."},{"key":"ref_110","doi-asserted-by":"crossref","first-page":"147934","DOI":"10.1016\/j.msea.2025.147934","article-title":"Microstructure evolution and mechanical properties of Ti-6Al-4V alloy fabricated by directed energy deposition assisted with dual ultrasonic vibration","volume":"925","author":"Peng","year":"2025","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_111","doi-asserted-by":"crossref","first-page":"584","DOI":"10.1016\/j.jmrt.2025.12.022","article-title":"Ultrasound-aided laser additive manufacturing achieves synergistic optimization of microstructure and properties in high-temperature titanium alloy","volume":"41","author":"Ai","year":"2026","journal-title":"J. Mater. Res. Technol."},{"key":"ref_112","doi-asserted-by":"crossref","first-page":"581","DOI":"10.1108\/RPJ-05-2018-0118","article-title":"Microstructure and mechanical property of TiB reinforced Ti matrix composites fabricated by ultrasonic vibration-assisted laser engineered net shaping","volume":"25","author":"Ning","year":"2019","journal-title":"Rapid Prototyp. J."},{"key":"ref_113","doi-asserted-by":"crossref","first-page":"113768","DOI":"10.1016\/j.matdes.2025.113768","article-title":"Near \u03b1 titanium alloy Ti60 with equiaxed \u03b2 grain fabricated by laser direct energy deposition assisted with ultrasound","volume":"252","author":"Ai","year":"2025","journal-title":"Mater. Des."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/19\/4120\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T04:17:54Z","timestamp":1790828274000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/19\/4120"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,26]]},"references-count":113,"journal-issue":{"issue":"19","published-online":{"date-parts":[[2026,10]]}},"alternative-id":["ma19194120"],"URL":"https:\/\/doi.org\/10.3390\/ma19194120","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,26]]}}}