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Transactions of Materials and Heat Treatment. 2021, (10) Core

Research progress on type Ⅳ creep cracking of welded joint of high Cr martensitic heat resistant steelChinese Full TextEnglish Full Text (MT)

WANG Yan-kun;LIU Zi-yun;MA Qing-shuang;ZHANG Hai-lian;HE Xiang;LI Hui-jun;GAO Qiu-zhi;School of Resources and Materials,Northeastern University at Qinhuangdao;State Key Laboratory of Rolling Technology and Automation,Northeastern University;Daotian High Technology Co Ltd,Qinhuangdao;School of Materials Science and Engineering,Tianjin University;

Abstract: Type Ⅳ creep cracking is an intergranular brittle fracture in the fine-grained heat-affected zone（FGHAZ） of welded joint under high temperature and low stress, which has an important influence on the high temperature creep properties of high Cr martensitic heat resistant steel welded joint. In this paper, the microstructure evolution and fracture mechanism in the process of type IV creep cracking, as well as the influence of the microstructure change, multiaxial stress state and welding residual stress on the creep properties of the joint are analyzed in detail, and the corresponding control measures are put forward. At the same time, the existing problems and blind spots in the research on the type IV creep cracking of welded joint of high Cr martensitic heat resistant steel are analyzed and summarized.
Keywords：

martensitic heat resistant steel; creep cracking; welded joint;

  • DOI：

    10.13289/j.issn.1009-6264.2021-0195

  • Series：

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry

  • Subject：

    Metal Science and Metal Technics

  • Classification Code：

    TG407

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