高强钢焊接接头显微组织的研究进展  

Research Progress on Microstructure of Welded Joint of High Strength Steel

作　　者：王伟光 张天理 于一帆 武雯 陈浩欣 WANG Weiguang;ZHANG Tianli;YU Yifan;WU Wen;CHEN Haoxin(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Research Institute of Materials,Shanghai 200437,China)

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]上海材料研究所,上海200437

出　　处：《理化检验（物理分册）》2021年第3期50-55,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：国家自然科学基金资助项目(51804196)。

摘　　要：综述了热输入、合金元素、冷却速率和应变速率对高强钢焊接接头显微组织的影响和高温共聚焦显微镜原位观察高强钢显微组织的最新研究进展,总结了高强钢焊接接头粗晶热影响区显微组织的转变机理。结果表明:通过延长冷却时间、减少热输入量、控制合金元素的含量和采用预处理提高应变速率等方法,可以调控高强钢焊接接头显微组织中马氏体、粒状贝氏体和针状铁素体的含量达到最佳比例,从而优化高强钢焊接接头的力学性能。通过高温共聚焦显微镜可以观察到高强钢相变的动态过程,从而得出高强钢的相变原理,为高强钢焊接工艺的制定提供指导。The effects of heat input,alloying elements,cooling rate and strain rate on microstructure of high strength steel welded joint and the latest research progress in situ observation of microstructure of high strength steel by high temperature confocal microscope were reviewed.The transformation mechanism of microstructure in coarse grain heat affected zone of welded joint of high strength steel was summarized.The results show that the contents of martensite,granular bainite and acicular ferrite in the microstructure of high strength steel welded joint can be controlled to reach the optimal proportion by prolonging cooling time,reducing heat input,controlling the content of alloying elements and increasing strain rate by pretreatment,so as to optimize the mechanical properties of high strength steel welded joint.The dynamic process of phase transformation of high strength steel can be observed by high temperature confocal microscope,and the phase transformation principle of high strength steel can be obtained,which can provide guidance for the formulation of high strength steel welding process.

关 键 词：高强钢 粗晶热影响区 原位观察 显微组织 固态相变 

分 类 号：TG442[金属学及工艺—焊接]