摘要
为了实现非晶合金大面积均匀应力强化,采用有限元数值模拟方法研究了激光多点冲击诱导Zr基块体非晶合金的表面残余应力场,得到了不同工艺条件下表面残余应力分布规律。结果表明,经激光冲击强化处理后,非晶合金表面形成了一定深度的残余压应力,然而,残余压应力的大小和均匀性受激光多点冲击工艺参数(相邻光斑中心距、搭接率和冲击波峰值压力)的显著影响;相邻光斑中心距对激光冲击区域的残余压应力影响较小,而光斑之间区域的残余压应力随光斑中心距的减小发生显著变化,其值逐渐增大;相邻光斑搭接冲击时,随搭接率的增加,非晶合金表面形成的残余压应力增大,且均匀性得到提高,搭接率相同时,搭接冲击排数对残余压应力并无明显影响;冲击波峰值压力越大,非晶合金表面残余压应力越大,但应力分布越不均匀,而且冲击区域凹凸不平的微凹坑形貌越明显。
In order to realize the large-area uniform stress strengthening of amorphous alloy,the residual stress fields on Zr-based amorphous alloy surface induced by multiple laser shock processing were investigated through the finite element numerical simulation method.The surface residual stress distribution rule under different process conditions was obtained.The results showed that after laser shock processing treatment,residual compressive stress was formed in a certain depth from amorphous alloy surface,however,the uniformity and value of the residual compressive stress were markedly influenced by the multiple laser processing parameters (the center distance between adjacent spots,overlapping rate and shock wave peak pressure).The effect of the center distance between adjacent spots on the residual compressive stress of laser shock zone was smaller,but the residual compressive stress in the region between two laser spots significantly changed with the reduction of spot center distance,the value of which gradually increased.When shocked,with adjacent overlapping spots,the residual compressive stress on amorphous alloy surface increased with the increase of overlapping rates, and its homogeneity was improved.When overlapping rate was equal,the impact row number had no obvious influence on residual compressive stress.The greater the shock wave peak pressure,the larger the residual compressive stress on the amorphous alloy surface,but the more uneven the stress distribution and the more obvious the lumpy micro dimple morphology in the impact area.
作者
崔熙贵
梅鹏
阴冠超
方翠
潘金鑫
崔承云
Cui Xigui;Mei Peng;Yin Guanchao;Fang Cui;Pan Jinxin;Cui Chengyun(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2018年第11期1156-1163,共8页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51505198)
教育部博士点新教师基金项目(20123227120023)资助
关键词
非晶合金
激光多点冲击
残余应力
表面形貌
amorphous alloy
multiple laser shock
residual stress
surface morphology
