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采用MIG焊焊接超高强钢35Cr Mn Si A,对热处理前后焊接接头组织进行分析,并对热处理后焊接接头进行了硬度测试、拉伸试验、冲击试验及断口分析,从而研究分析了35Cr Mn Si A的焊接性。结果表明:焊态下,焊缝区组织为针状马氏体和少量残余奥氏体,热影响区组织为板条状马氏体、贝氏体和残余奥氏体;热处理后,焊缝组织为回火马氏体和残余奥氏体,热影响区组织为回火马氏体、少量贝氏体和残余奥氏体;焊接接头焊缝区的硬度高于热影响区和母材;焊接接头抗拉强度为1640.8 MPa,伸长率为9.2%,焊缝区冲击功为37.6 J,焊缝区的冲击断口为混合断口。
The microstructure of welded joint before and after heat treatment was analyzed by MIG welding of 35Cr Mn Si A ultra-high strength steel. The hardness, tensile test, impact test and fracture analysis of the welded joint after heat treatment were analyzed. The effects of 35Cr Mn Si A Weldability. The results show that the microstructure of the weld zone is acicular martensite and a small amount of retained austenite in the weld zone, and the microstructure of the HAZ is lath martensite, bainite and retained austenite. After heat treatment, the weld The microstructures are tempered martensite and retained austenite. The HAZ is composed of tempered martensite, a small amount of bainite and retained austenite. The hardness of weld zone in the welded joint is higher than that in the heat affected zone and the base metal. The tensile strength of the welded joint is 1640.8 MPa, the elongation is 9.2%, the impact energy of the weld zone is 37.6 J, and the impact fracture of the weld zone is the mixed fracture.