{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:54:22Z","timestamp":1787028862699,"version":"build-2736575974"},"reference-count":42,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T00:00:00Z","timestamp":1779235200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100019351","name":"State Key Laboratory of Advanced Special Steel","doi-asserted-by":"crossref","award":["SKLASS 2025-Z07"],"award-info":[{"award-number":["SKLASS 2025-Z07"]}],"id":[{"id":"10.13039\/501100019351","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The hydrogen embrittlement (HE) behavior of an Fe\u201318Mn\u20138Al\u20131C\u20135Ni lightweight steel containing a fine and uniformly distributed B2 phase and \u03ba-carbide was investigated by slow strain rate tensile testing with in situ hydrogen charging. Hydrogen charging reduces the elongation from 28.2% to 11.2%, while preserving an ultimate tensile strength above 1100 MPa and yielding an HE index of 60.2%. A thermal desorption analysis reveals a multi-peak desorption curve corresponding to diffusible hydrogen, hydrogen reversibly trapped at \u03ba-carbides, and hydrogen strongly bound at the B2\/\u03b3 interfaces, revealing a hierarchical hydrogen trapping behavior. Electron backscatter diffraction and electron channeling contrast imaging analyses near the fracture head region further reveal that localized hydrogen enrichment at the B2\/\u03b3 boundaries induces severe stress concentration and interfacial weakening, shifting the fracture mode from ductile micro-void coalescence in air to hydrogen assisted intergranular and interphase cracking. This study clarifies the distinct roles of coherent \u03ba-carbide and B2\/\u03b3 interfaces in hydrogen trapping and crack initiation, offering a microstructure-based perspective for designing high-strength, HE resistant lightweight steels.<\/jats:p>","DOI":"10.3390\/ma19102137","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T09:12:41Z","timestamp":1779268361000},"page":"2137","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Hydrogen Embrittlement and Failure Mechanisms in Fe\u201318Mn\u20138Al\u20131C\u20135Ni Steel with Dual B2\/\u03ba-Carbide Precipitates"],"prefix":"10.3390","volume":"19","author":[{"given":"Jiahao","family":"Li","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhilin","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuyang","family":"Qian","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1257-8892","authenticated-orcid":false,"given":"Xiaofei","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China"},{"name":"State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua","family":"Ding","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1537","DOI":"10.1016\/j.jmrt.2023.06.037","article-title":"Research status and development prospect of Fe-Mn-C-Al system low-density steels","volume":"25","author":"Bai","year":"2023","journal-title":"J. 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