2GPa热成形钢电阻点焊接头的显微组织与力学性能  

Microstructure and Mechanical Properties of 2 GPa Hot-formed Steel Resistance Spot Welded Joints

作　　者：王轲 姚再起 刘永锋[1] 朱铁军[1] 袁超 罗浩瑄 郭秋彦 WANG Ke;YAO Zaiqi;LIU Yongfeng;ZHU Tiejun;YUAN Chao;LUO Haoxuan;GUO Qiuyan(State Key Laboratory of Silicon Materials,Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,China;Ningbo Geely Automobile Research and Development Co.,Ltd.,Vehicle Performance and Testing Center,Ningbo 315336,China)

机构地区：[1]硅材料国家重点实验室,浙江省电池新材料及应用技术重点实验室,浙江大学材料科学与工程学院,浙江杭州310058 [2]宁波吉利汽车研究开发有限公司,整车性能及测试中心,浙江宁波315336

出　　处：《材料科学与工程学报》2023年第3期354-358,365,共6页Journal of Materials Science and Engineering

基　　金：国家重点研发计划资助项目(2020YFB1709404)。

摘　　要：以Usibor2000/Usibor2000/HSLA260GI焊接组合为研究对象,对2GPa热成形钢电阻点焊接头显微组织和力学性能进行了研究。结果表明,随着焊接时间的增加,熔核直径和热影响区宽度逐渐增加,熔核内部缺陷逐渐减小,但显微组织基本一致,由熔核区至母材,显微组织依次为马氏体、马氏体、马氏体、马氏体+铁素体、回火马氏体、马氏体。其中热影响区存在明显软化。拉伸实验表明,随着焊接时间的增加,接头剪切拉伸最大力逐渐增加,十字拉伸最大力基本不变。Taking Usibor2000/Usibor2000/HSLA260GI as the research object,the effects of welding time on the microstructure and mechanical properties of 2 GPa hot-formed steel spot resistance spot welded joints were studied.The results show that with the increase of welding time,the diameter of FZ(Fusion Zone)and the width of HAZ(Heat Affected Zone)gradually increase,the macro-cavity size in FZ gradually decreases.But,the microstructure basically remains unchanged.From FZ to BM(Base Material),the microstructures are successively M,M,M,M+F,tempered M and M.There is a softening zone at the HAZ.The tensile test results demonstrate that the maximum force of shear tensile increases gradually with the increase of welding time,while the maximum force of cross tensile basically remains unchanged.

关 键 词：2GPa热成形钢 电阻点焊 显微组织 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]