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本文对T-1、StE690和Wel-ten80c等3种800MPa级低合金高强度钢的t_((?)/s)(800℃至500℃冷却时间)为5s和65s时焊接过热区的韧性和氢裂敏感性进行了研究并测试了其残余奥氏体含量;应用透射电镜观察比较了两种过热区的精细结构。研究认为,界面碳化物存在特征和岛状组织精细构成是影响全马氏体(M)过热区和全贝氏体(B_1)过热区性能的重要因素;当残余奥氏体呈薄膜状或条状存在时,其量越多,对降低过热区氢裂敏感性越有利。
In this paper, the T_ ((?) / S) (cooling time from 800 ℃ to 500 ℃) of three kinds of 800MPa low alloy high strength steels T-1, StE690 and Wel-ten80c are 5s and 65s, Hydrogen cracking sensitivity was studied and the residual austenite content was tested. The fine structures of the two overheated zones were compared by transmission electron microscope. It is believed that the existence of interfacial carbides and the fine structure of island tissue are important factors that affect the overheated zone of the whole martensite (M) and the superheat zone of the whole bainite (B 1). When the retained austenite is in the form of film or strip When present, the greater the amount, the more advantageous to reduce the susceptibility to hydrogen cracking in the overheated zone.