摘要
激光功率密度和搭接率对马氏体不锈钢的激光冲击区的表面轮廓有较大影响。激光功率密度从3.79 GW/cm2到7.25GW/cm2,冲击区塑性变形程度随功率密度增大而增大,当激光功率密度为6.09 GW/cm2时,冲击区塑性变形程度适中,其残余应力平均值达-569.1 MPa。搭接率试验结果表明,搭接率为33%时,可获得较大面积无挤出的激光冲击区,无挤出区域的塑性均匀,变形深度波动幅度在2μm以内,而且此搭接率下冲击区挤出面积较小,分布具有规律,便于再次冲击以降低冲击区的表面波纹度。
Laser power density and overlap ratio had a dramatic influence of surface profile of laser shock zone for martensite stainless steel. The plastic deformation inside laser shock zone was increased when laser power density rised from 3.79 GW/ cm^2 to 7.25 GW/cm^2. Considering this technics research applied to thin-case workpiece, a moderate plastic deformation was gained by laser power density 6.09 GW/cm^2 , and the residual stress reached to -569. 1 MPa. The large area laser shock zone without extrusion was formed with overlap ratio of 33%, and the depth of shock zone fluctuated within 2 um, and there was a very small extrusion area with regular distribution to be convenient for secondary laser shock to extrusion area.
出处
《应用激光》
CSCD
北大核心
2008年第4期278-281,共4页
Applied Laser
关键词
激光冲击处理
激光喷丸
马氏体不锈钢
表面轮廓
Laser shock processing
laser peening
martensite stainless steel
surface profile
