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。
Effect of plate thickness on residual stress of GH625 superalloytreated by laser shock peening
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 0.005 21,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.
laser shock peeningGH625 superalloyresidual stressfinite element simulation
NETL
NSTL
万方数据
