母材成分对DP590钢电阻点焊接头性能的影响  

Effect of base metal chemical composition on properties of resistance spot welding joint of DP590 steel

作　　者：王敏[1] 吴毅雄[1] 潘华[2] 雷鸣[2] 

机构地区：[1]上海交通大学上海市激光制造与材料改性重点实验室,上海200240 [2]宝山钢铁股份有限公司技术中心,上海201900

出　　处：《焊接学报》2010年第2期33-35,共3页Transactions of The China Welding Institution

基　　金：上海市科教兴市基金资助项目

摘　　要：通过对两种强度相近、母材化学成分不同的DP590双相钢电阻点焊接头的强度、断口及熔核TEM分析,揭示了母材化学成分对双相钢点焊接头强韧性的影响规律及机理.结果表明,母材碳含量越高,接头正拉强度及韧性越差,其主要机理是,在电阻点焊不平衡的急速冷却条件下,随着母材碳含量的增加,在点焊熔核及熔合区形成了板条状或片状的孪晶马氏体亚结构,从而降低了接头的韧性.Based on the strength test, SEM analysis of cross-tensile fracture and TEM analysis of nugget of spot welding joint (RSW) from two kinds of DP590 dual-phase high strength steel with approximate strength level and different chemical composition, the mechanism and effect of chemical component of base metal on the strength and toughness of RSW joint of the DP590 steel are studied. The results show the more carbon content in base metal is, the less cross-tensile strength and toughness of spot welding joint are. The main mechanism is that the twin martensite forms in the nugget and fusion zone as the increase of carbon content under imbalanced express cooling of RSW, which will lead toughness of spot welding joint to decrease.

关 键 词：高强双相钢 电阻点焊 母材化学成分 接头性能 

分 类 号：TG444.7[金属学及工艺—焊接]