板厚对激光冲击GH625高温合金残余应力的影响  

Effect of plate thickness on residual stress of GH625 superalloytreated by laser shock peening

作　　者：陆大兴 葛茂忠 陈浩 汤洋 LU Daxing;GE Maozhong;CHEN Hao;TANG Yang(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou Jiangsu 213001,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001 [2]广东工业大学机电工程学院,广州510006

出　　处：《激光杂志》2024年第6期215-220,共6页Laser Journal

基　　金：江苏省科技成果转化项目(No.BA2018070)。

摘　　要：为了研究板厚对激光冲击GH625高温合金残余应力的影响,一方面,采用激光冲击处理技术对2 mm GH625板进行强化处理,借助X射线应力测试仪获得表面残余应力分布;另一方面,利用ABAQUS有限元仿真软件对厚度分别为2 mm、3 mm、4 mm和5 mm的GH625板进行激光冲击数值模拟。采用实验测量和数值模拟相结合的方法,对GH625高温合金的Johnson-Cook本构方程进行优化。结果表明:当应变率影响系数C=0.005 21时,激光冲击GH625表面残余应力模拟结果与试验结果相吻合;随着GH625板材厚度的增加,表面残余压应力大小和残余压应力分布深度均随之增大;板材背面也存在残余压应力,其大小随板材厚度的增大而减小。In order to study the effect of plate thickness on residual stress of GH625 superalloy subjected to laser shock peening,on the one hand,laser shock strengthening technology was used to impact 2 mm GH625 plate,and the surface residual stress distribution was obtained by X-ray stress tester;on the other hand,ABAQUS finite element simulation software was used to perform numerical simulation of laser shock GH625 plates with thicknesses of 2 mm,3 mm,4 mm,and 5 mm.Through the combined method of experiment and numerical simulation,the Johnson-Cook(J-C)constitutive equation of GH625 high-temperature alloy was optimized.The results indicate that when the strain rate influence factor C is 0.00521,the simulated residual stress on the surface of laser shocked GH625 is in good a-greement with the experimental results.As the thickness of the GH625 plate increases,both the magnitude of compres-sive residual stress on the surface and the depth of residual stress distribution increase.There is also compressive resid-ual stress on the backside of the plate,which decreases with the increase of plate thickness.

关 键 词：激光冲击处理 GH625高温合金 残余应力 有限元仿真 

分 类 号：TN249[电子电信—物理电子学]