低温烘烤对DP980双相钢激光拼焊板性能的影响  

Effect of Low Temperature Baking on Properties of DP980 Dual Phase Steel Laser Tailor-Welded Blank

作　　者：王金凤 李聪 史秋月 袁耀 刘峰 WANG Jinfeng;LI Cong;SHI Qiuyue;YUAN Yao;LIU Feng(School of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China)

机构地区：[1]湖北汽车工业学院材料科学与工程学院,湖北十堰442002

出　　处：《热加工工艺》2023年第24期152-156,共5页Hot Working Technology

基　　金：中央引导地方科技专项基金项目资助(ZYYD023)。

摘　　要：以DP980双相钢激光拼焊板为研究对象,通过对预压、150~190℃保温10~30 min烘烤处理后的接头进行拉伸试验、金相试验、显微硬度测试、扫描电镜观察等,对比研究了模拟烘烤前后以及不同烘烤条件下接头的性能。结果表明:烘烤后接头的抗拉强度提高了80~120 MPa,而断后伸长率从焊态的4.88%下降到2.80%~3.48%;焊接接头不同区域的硬度均有所增加,尤其是软化区硬度从焊态的220 HV左右提高到了烘烤后的280 HV左右;焊接接头不同区域的平均硬度随烘烤温度的升高而增加,但保温时间对硬度的影响不明显。Taking DP980 dual phase steel laser tailor-welded blank as the object,the welded blanks processed by prepressing and baking at 150-190℃ for 10-30 min was studied through tensile test,micro-hardness test and SEM observation,and the properties of the joints before and the joints after baking and the joints under different baking conditions were investigated.The results show that the tensile strength of the welded joint after baking increases by 80-120 MPa,the elongation decreases from 4.88%of the welded state to 2.80%-3.48%;the hardness of the welded joint in different regions increases,especially the hardness of the softening zone increases from about 220 HV of the welded state to about 280HV after baking.The average hardness of different areas of the welded joint increases with the increase of baking temperature,but the influence of holding time on the hardness is not obvious.

关 键 词：DP980双相钢 激光焊接 低温烘烤 烘烤时间 硬度 

分 类 号：TG456.7[金属学及工艺—焊接] TG441.8