{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T19:07:15Z","timestamp":1784833635603,"version":"3.55.0"},"reference-count":30,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2022,9,25]],"date-time":"2022-09-25T00:00:00Z","timestamp":1664064000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52075366"],"award-info":[{"award-number":["52075366"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["WZXGL202105"],"award-info":[{"award-number":["WZXGL202105"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Research On Failure Mechanisms For the Girth Weld Of High Steel Pipelines","award":["52075366"],"award-info":[{"award-number":["52075366"]}]},{"name":"Research On Failure Mechanisms For the Girth Weld Of High Steel Pipelines","award":["WZXGL202105"],"award-info":[{"award-number":["WZXGL202105"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>In the current study, post-weld heat treatment (PWHT 580 \u00b0C) was used for an X80 pipeline steel-welded joint, and the fracture toughness of the welded joint was investigated using a crack tip opening displacement (CTOD) test. The relationship between microstructure evolution and fracture toughness is also discussed in this study. The results showed that the weld center mainly consisted of acicular ferrite (AF). The subcritical heat-affected zone (SCHAZ) consisted of a large amount of fine polygonal ferrite and some AF, and it maintained the rolling state of the base metal. The microstructure of the coarse-grained heat-affected zone (CGHAZ) was composed of granular bainite (GB) and M\/A constituents, the latter of which decreased after the PWHT. The CTOD values of the weld center were in the range of 0.18\u20130.27 mm, while those of the CGHAZ were in the range of 0.02\u20130.65 mm. A brittle fracture occurred in the CGHAZ for both the as-welded and PWHT samples; the CTOD values were 0.042 mm and 0.026 mm, respectively. The CTOD values of the SCHAZ\u2019s location were in the range of 0.8\u20130.9 mm. The PWHT did not deteriorate the microstructure of the CGHAZ and had little influence on the fracture toughness of the X80 pipeline steel-welded joint; it ensured the fracture toughness of the welded joints and reduced the welding residual stress.<\/jats:p>","DOI":"10.3390\/ma15196646","type":"journal-article","created":{"date-parts":[[2022,9,26]],"date-time":"2022-09-26T01:41:58Z","timestamp":1664156518000},"page":"6646","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint"],"prefix":"10.3390","volume":"15","author":[{"given":"Xueli","family":"Wang","sequence":"first","affiliation":[{"name":"Key Laboratory of Advanced Joining Technology of Tianjin, Department of Materials Science and Engineering, Tianjin University, Road Weijin 92, Tianjin 300072, China"},{"name":"Pipe China North Pipeline Company, Road Xinkai 408, Langfang 065000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongpo","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Joining Technology of Tianjin, Department of Materials Science and Engineering, Tianjin University, Road Weijin 92, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8443-8891","authenticated-orcid":false,"given":"Lianshuang","family":"Dai","sequence":"additional","affiliation":[{"name":"China Oil & Gas Piping Network Corporation, Beijing 100013, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caiyan","family":"Deng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Joining Technology of Tianjin, Department of Materials Science and Engineering, Tianjin University, Road Weijin 92, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5851-9679","authenticated-orcid":false,"given":"Chengning","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Joining Technology of Tianjin, Department of Materials Science and Engineering, Tianjin University, Road Weijin 92, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanjun","family":"Wang","sequence":"additional","affiliation":[{"name":"Pipe China Beijing Pipeline Co., Ltd., Beijing 100101, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Shen","sequence":"additional","affiliation":[{"name":"Pipe China Beijing Pipeline Co., Ltd., Beijing 100101, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.ijpvp.2018.04.004","article-title":"Microstructure and impact toughness of reheated coarse grain heat affected zones of API X65 and API X80 linepipe steels","volume":"163","author":"Arora","year":"2018","journal-title":"Int. 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