不等厚异质双相钢激光拼焊接头组织及成形性能研究  

Study on Laser Tailor Welding Joints Microstructures and Forming Performance of Dissimilar Thickness Dual-phase Steel

作　　者：周磊磊 何超军 余腾义[1] 靳阳 王亮赟 王敏莉[1] Zhou Leilei;He Chaojun;Yu Tengyi;Jin Yang;Wang Liangyun;Wang Minli(Pangang Group Panzhihua Iron and Steel Research Institute Co.,Ltd.,Panzhihua,Sichuan617000,China;PCMI Metal Products(Chongqing)Co.,Ltd.,Chongqing404100,China)

机构地区：[1]攀钢集团攀枝花钢铁研究院有限公司,四川攀枝花617000 [2]攀中伊红金属制品(重庆)有限责任公司,重庆404100

出　　处：《应用激光》2021年第2期299-304,共6页Applied Laser

摘　　要：采用不同的焊接速度及激光功率对1.6mm厚DP590及2.0mm厚DP780进行了激光拼焊,通过检验焊接接头的宏观形貌、显微组织构成、拉伸性能、扩孔率及杯突值,分析了焊接速度对接头组织及拉伸性能的影响,并综合评价了接头的成形性能。结果表明:激光拼焊接头成形良好,焊缝区由柱状马氏体构成,热影响区各区域由马氏体及铁素体构成,组织形态略有区别;焊接速度对接头显微组织、屈服强度及抗拉强度无明显影响,逐步提升焊接速度,焊接接头延伸率呈上升趋势;激光拼焊板的杯突值及扩孔率低于两种母材,两侧母材是成形过程中的薄弱环节,当激光功率3.72kW,焊接速度5.5m/min时,焊接接头拉伸性能及成形性能最优。1.6mm DP590and 2.0mm DP780were welded by laser tailor welding under different welding speeds and different laser power,the macro-morphology,microstructure,tensile properties,hole expanding rate and cupping value of the welded joints were tested,analyzed the influence of welding speed on microstructure and tensile properties,revealed the forming performance of welding joints.The result indicate that,the laser welding joints were well formed,the microstructure of weld zone was columnar martensite,the microstructure in the heat-affected zone were composed of martensite and ferrite,and the morphology of microstructure between weld zone and heat-affected zone were slightly different;the welding speed had no obvious effect on the microstructure,yield strength and tensile strength of the joints,increased the welding speed gradually,the elongation of welded joints showed an upward trend;the cupping value and hole expanding rate of laser welded plate were lower than that of two side base metal,but the base material of both sides were vulnerable spot in the forming process.When the laser power was 3.72kW,the welding speed was 5.5m/min,the joints shower the best tensile properties and forming performance.

关 键 词：双相钢 激光拼焊 显微组织 拉伸性能 成形性能 

分 类 号：TG456.7[金属学及工艺—焊接]