激光冲击处理对奥氏体不锈钢薄板焊接接头表面残余应力的影响  

Effects of Laser Shock Processing on Surface Residual Stress of Austenitic Stainless Steel Sheet Welded Joint

作　　者：钱绍祥[1,2] 殷苏民[2] 葛涛[2] 张志凤[1] 

机构地区：[1]镇江市高等专科学校机械系,江苏镇江212003 [2]江苏大学机械工程学院,江苏镇江212003

出　　处：《热加工工艺》2014年第1期176-178,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(51179076)

摘　　要：利用激光冲击对AISI202奥氏体不锈钢薄板焊接接头进行了表面强化处理,采用X射线衍射法测定其激光冲击处理后的表面残余应力,分析了单次冲击和搭接冲击两种工艺下焊接接头表面残余应力场分布。结果表明,经搭接激光冲击处理后,AISI202焊接接头显微硬度提高了约50%,纵向残余压应力σx达到395 MPa,横向残余压应力σy达到456 MPa,显著增强表面残余压应力,并使得残余压应力趋向均匀。The surface of AISI202 austenitic stainless steel sheet welding joint was processed by laser shock processing, Surface residual stress of welding joint treated by LSP was used by X-ray diffraction method. The surface residual stress distribution in the welded joint was analyzed by two kinds of single LSP and overlapping LSP. The experimental results show that the microhardness treated by overlapping LSP is improved by 60%. The longitudinal direction residual compressive stress trx treated by overlapping LSP reached 395MPa,the landscape orientation residual compressive stress try treated by overlapping LSP reach 456 MPa. The surface residual compressive stress is enhanced significantly, and the distribution of the residual compressive stress tends to be uniform.

关 键 词：激光冲击处理 搭接冲击 不锈钢薄板 焊接接头 残余应力 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG441.8