激光斜冲击强化对GH4169高温合金表面质量的影响

Effect of Laser Oblique Shock Peening on Surface Quality of GH4169 Superalloy

航空发动机零部件结构复杂、尺寸小,光束可达性差,为探讨激光斜冲击强化技术对GH4169高温合金材料的强化效果,通过激光斜冲击强化试验,研究了激光冲击强化工艺参数对材料表面和深度方向残余应力、表面粗糙度和显微硬度的影响。结果表明:激光能量增大、冲击次数增加,均会使材料的表面和深度方向残余应力增大,显微硬度提高,表面粗糙度值增加;采取5 J,6 J,7 J的能量搭配时,获得的指标值相对最好,此时的表面粗糙度为1.08μm,表面残余压应力为-446.9 MPa,残余压应力层深度为1500μm,显微硬度为448.1 HV,且影响深度为1300μm。

The aero-engine parts have complex structures,small size,and poor beam accessibility.In order to explore the strengthening effect of laser oblique shock peening technique on GH4169 superalloy materials,this paper studies the effect of laser shock peening process parameters on the surface and depth residual stress,surface roughness and microhardness through laser oblique shock peening experiments.The results show that the surface and depth residual stress,microhardness and surface roughness increase with the increase of laser energy and impact times;when the(5 J,6 J,7 J)energy collocation is adopted,the index value obtained is relatively the best,the surface roughness value is 1.08μm,the surface residual compressive stress is-446.9 MPa,the residual compressive stress layer depth is 1500μm,the microhardness is 448.1 HV and the depth of influence is 1300μm.