T-1、StE690和Wel-ten80c钢焊接过热区精细结构及对性能的影响  

Microstructure and its effect on properties of weld overheated zone of T-1, StE690 and Wel-ten80c steel

作　　者：张国九 周昭伟[1] 蔡宏彬[1] 

机构地区：[1]哈尔滨焊接研究所

出　　处：《焊接学报》1992年第1期13-20,共8页Transactions of The China Welding Institution

摘　　要：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。The toughness and susceptibility to hydrogen-induced cracking of the t_(8/5)=5s and 65s weld overheated zone (WOZ) of T-1, StE690 and Wel-ten80c HSLA steel of SOOMPa grade tensile strength were studied. The microstructure of the WOZ, in which the retained austenite content was detected, was observed and compared by TEM. It was shown that the feature of interface carbide in the martensite structure and micro-constitution of island-like structure in the B_1 structure are the important factors affecting the properties of the WOZ. When the retained austenite is in the shape of membrane or strip, the larger its amount is, the better it reduces the susceptibility to hydrogen-iuduced cracking in the WOZ.

关 键 词：焊接 过热区 精细结构 性能 

分 类 号：TG404[金属学及工艺—焊接]