搭接率对AISI202焊接接头激光冲击应力分布的影响  

Effects of Overlapping Rate on Stress Distribution of AISI202 Welding Joint by Laser Shock Processing

作　　者：钱绍祥[1,2] 殷苏民[2] 张飞霞[1] 张志凤[1] 

机构地区：[1]镇江市高等专科学校,镇江212003 [2]江苏大学,镇江212003

出　　处：《表面技术》2013年第6期15-17,39,共4页Surface Technology

基　　金：国家自然科学基金资助项目(51179076);江苏省普通高校研究生科研创新计划资助项目(CXLX13-640)~~

摘　　要：目的研究光斑搭接率对激光冲击处理后残余应力分布的影响。方法采用不同的光斑搭接率对AISI202不锈钢焊接接头进行激光冲击处理,利用X射线衍射法测定激光冲击强化后的残余应力。结果随着光斑搭接率的增加,残余应力场得到增强,并且应力分布更加均匀。搭接率由50%增加到80%,平均横向残余压应力增加了20%,波动减少了30%;平均纵向残余压应力增加了30%,波动减少了13%。结论提高光斑搭接率可以优化激光冲击处理后焊接接头的应力分布。Objective The effects of the overlapping rate of laser spots on the residual stress distribution after la- ser shock processing （LSP） were investigated. Methods The surface of AISI202 stainless steel welding joint was processed by LSP with different overlapping rates of laser spots. The residual stress of welding joint treated by LSP was determined by the X-ray diffraction method. Results The residual stress was enhanced and its distribution became more uniform when the overlapping rate increased. As the overlapping rate increased from 50% to 80% , the average of landscape orientation residual compressive stress try was improved by 20% and its fluctuation was decreased by 30%, while the average of longitudinal direction residual compressive stress trx was improved by 30% and its fluctuation was decreased by 13%. Conclusion The distribution of the residual stress of welding joint treated by LSP can be opti- mized by increasing the overlapping rate.

关 键 词：激光冲击处理 搭接率 焊接接头 残余应力 

分 类 号：TG156.99[金属学及工艺—热处理] TG40[金属学及工艺—金属学]