Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

• Published in: Materials Vol. 15; no. 19; p. 6646
• Main Authors: Wang, Xueli, Wang, Dongpo, Dai, Lianshuang, Deng, Caiyan, Li, Chengning, Wang, Yanjun, Shen, Ke
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 25.09.2022; MDPI
• Subjects: Annealing; Bainite; Base metal; Chemical properties; coarse-grained heat-affected zone; Crack opening displacement; crack tip opening displacement; Crack tips; Design and construction; Fracture toughness; Heat affected zone; Heat treating; High strength low alloy steels; Iron constituents; Materials research; Mechanical properties; Metal fatigue; Microstructure; Pipe lines; pipeline steel; Pipelines; Post-weld heat treatment; Residual stress; Steel; Structural steels; Thermal cycling; Welded joints; China; Japan

In the current study, post-weld heat treatment (PWHT 580 °C) 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 i...