超声冲击对Q460高强钢焊接接头残余应力及组织性能的影响  

Effect of ultrasonic impact treatment on residual stress microstructure and hardness in Q460 high-strength steel welded joint

作　　者：朱海洋 刘川[2] 邹家生[2] Zhu Haiyang;Liu Chuan;Zou Jiasheng(College of Metallurgy and Materials Engineering,Suzhou Institute of technology,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China;College of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China)

机构地区：[1]江苏科技大学苏州理工学院冶金与材料工程学院,江苏张家港215600 [2]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《焊接》2018年第8期11-13,65,66,共5页Welding & Joining

基　　金：国家自然科学基金项目(51575251)

摘　　要：以Q460高强钢焊接试板为研究对象,采用超声冲击处理接头表面,研究超声冲击对焊接残余应力及组织性能的影响。研究结果表明:超声冲击可以有效降低焊接残余应力,并使拉应力转化为压应力;超声冲击消除了焊缝与母材过渡区域的凹坑与尖角,焊趾处变得圆滑;超声冲击细化了表层晶粒,细化层深度约120μm;超声冲击后表面显微硬度提高了40 HV0. 2,硬化层深度约2 mm。The effect of ultrasonic impact treatment(UIT)on the welding residual stress,microstructure and hardness in Q460 high-strength steel welded joint was investigated.The investigated results show that UIT can effectively reduce the surface welding residual stress,and the tensile stress on the surface is turned into the compressive stress after UIT.In addition,UIT can eliminate the pits and sharp corners in the weld toe region,which results in smooth transition region between the weld toe and the base metal.Furthermore,grains in the surface are refined after UIT and the depth of the refined grain layer reaches up to 120μm.Moreover,the surface hardness is increased by 40 HV0.2 after UIT and the depth of hardened layer is about 2 mm.

关 键 词：超声冲击 Q460高强钢 残余应力 显微组织 硬度 

分 类 号：TG404[金属学及工艺—焊接]