ISSN:1000-8365 CN:61-1134/TG
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Welding Method and Welded Joint Microstructure Analysis of Nanostructured Bainite Steels
Author of the article:PAN Qiang;YANG Qian;WANG Yanhui;ZHAO Leijie;XU Dong;LI Li
Author's Workplace:Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province,School of Mechanical and Equipment Engineering,Hebei University of Engineering,Handan 056038,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;Hebei Technological Innovation Center for High Quality Cold Heading Steel,Hebei University of Engineering,Handan 056038,China
Key Words:nanostructured bainite welding cold crack martensite austenite
Abstract:As a new generation of steel,nanobainitic steel has a tensile strength of 2500 MPa,a fracture toughness of more than 30~40 MPa·M1/2,and a hardness of 600~670 HV,which has been widely used in industry.However,because the nanobainite steel often contains a certain amount of brittle martensite crystal structure,it is difficult to weld,the welded joint is easy to crack,and it is difficult to reach the same strength and hardness as the base metal,which limits its application scope.In this paper,the research progress of nano-bainitic steel welding in recent years is reviewed,and the microstructure changes of welds under different welding methods are described.