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不等厚DP1180/DP590双相钢激光拼焊接头的显微组织与力学性能

Microstructure and Mechanical Properties of Laser Tailor-Welded Joint of Dissimilar Thickness DP1180/DP590Dual-Phase Steels
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摘要 对1.2mm厚DP1180双相钢板和1.5mm厚DP590双相钢板进行激光拼焊,研究了接头的显微组织和力学性能。结果表明:接头焊缝表面基本无飞溅现象,成形质量良好;焊缝区由粗大柱状晶组成,为板条状马氏体和铁素体的双相组织;热影响区可分为临界区、细晶区和粗晶区,其组织均由马氏体和铁素体组成,DP1180钢侧的热影响区比DP590钢侧的宽;接头焊缝区的显微硬度最高,平均值达369HV;接头拉伸时均在母材DP590钢中断裂,其抗拉强度与DP590钢的相同,伸长率为14.7%,约为DP590钢的一半。 Laser tailor-welding was conducted on 1.2mm thick DP1180dual-phase steel plate and 1.5mm thick DP590dual-phase steel plate,and then microstructure and mechanical properties of the joint were studied.The results show that no spatter was observed on weld surface of the joint,indicating agood forming quality.The weld zone was composed of coarse columnar crystals and had a two-phase structure of lath martensite and ferrite.The heat affected zone consisted of critical zone,fine grain zone and coarse grain zone,whose structures were all composed of martensite and ferrite.The heat affected zone at the DP1180steel side was wider than that at the DP590steel side.The highest microhardness was found in the weld zone of the joint,with an average value of 369HV.Fracture occurred in the base metal of DP590steel during tensile.The tensile strength of the joint was the same as that of the DP590steel;the elongation of the joint was 14.7%,about half that of the DP590steel.
作者 尚庆慧 舒滢 王国栋 邢飞 李雅馨 郭学鹏 SHANG Qinghui;SHU Ying;WANG Guodong;XING Fei;LI Yaxin;GUO Xuepeng(Northwest Institute for Nonferrous Metal Research,Xi′an 710016,China;College of Materials Science and Engineering,Jilin University,Changchun 130022,China)
出处 《机械工程材料》 CAS CSCD 北大核心 2019年第3期44-49,共6页 Materials For Mechanical Engineering
关键词 不等厚 双相钢 激光拼焊 显微组织 力学性能 dissimilar thickness dual-phase steel laser tailor-welding microstructure mechanical property
作者简介 尚庆慧(1991-),男,陕西靖边人,助理工程师,硕士;通信作者:邢飞,讲师.
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