激光冲击处理对小孔构件残余应力场的影响

摘要

The surface of LY12CZ aluminum alloy hole component was treated with Nd:glasss laser,and its residu-al stress was tested and analyzed.In the impact of laser shock processing using the laser power density of 1.75 GW/cm2 and spot diameter of 6mm,the shocked area produced compressive residual stress with its deepness about 1.2mm.The maximum surface residual stress is -57MPa and the maximum residual stress in the thickness direc-tion is -36MPa.The optimization of LSP technological parameters can obtain good residual stress field.%采用高功率 Nd：glass 激光器对 LY12CZ 铝合金小孔构件表面进行激光冲击强化处理，并对冲击区域进行残余应力场的测试与分析。结果显示，在激光功率密度为1．75 GW/cm2和光斑直径为6 mm 的强激光冲击作用下，冲击区域产生了残余压应力场，层深约1．2 mm，表面最大残余应力为-57 MPa，厚度方向上最大残余应力为-36 MPa。优化后的激光冲击处理工艺参数能够获得较好的残余应力场。