摘要
以316L不锈钢作为模型材料,系统研究了低能量高重频激光冲击强化工艺。建立了激光光斑覆盖率概念,对于直径d为0.4~0.8 mm间的光斑,其饱和覆盖率在6~7之间。在此饱和覆盖率条件下,机械手移动速率v与光斑直径d的匹配关系为v=70d。最大残余压应力随着光斑直径的减小而增大,当光斑直径d为0.4 mm时获得最大残余压应力为662 MPa,残余压应力影响层深度为565μm。激光冲击强化区域表面粗糙度未明显增加,但与未冲击区域存在一定高度台阶。在1.59 GW/cm^(2)激光功率密度下,该台阶高度为23μm。
Using 316 L stainless steel as the model material,the low-energy high-repetition rate laser shock peening process was systematically studied.A concept of laser spot coverage ratio was established.For the spot diameter d between 0.4-0.8 mm,the saturation coverage ratio is 6-7,under which the matching relationship between the manipulator movement rate v and the spot diameter d is v=70d.The maximum residual compressive stress increases with the decrease of the spot diameter.When the spot diameter d is 0.4 mm,the maximum residual compressive stress is 662 MPa,and the depth of the residual compressive stress affected layer is 565μm.The surface roughness of the laser shock peened area does not increase significantly,but there is a step with certain height between the laser shocked and unshocked zones.At a laser power density of 1.59 GW/cm^(2),the step height is 23μm.
作者
覃恩伟
刘丽霞
刘成威
陆海峰
吴树辉
Qin Enwei;Liu Lixia;Liu Chengwei;Lu Haifeng;Wu Shuhui(Surface Technology and Engineering Division,Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou Jiangsu 215004,China;Suzhou Institute of Product Quality Supervision and Inspection,Suzhou Jiangsu 215104,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第9期92-97,共6页
Heat Treatment of Metals
基金
中国广核集团尖峰计划(3100129115)。
关键词
激光冲击
低能量
残余应力
覆盖率
laser shock
low energy
residual stress
coverage ratio
