渗铝对K417激光冲击强化效果的影响  

Impact of Aluminizing on Effects of K417 Material by Laser Shock Processing

作　　者：刘海雷[1] 龙霓东[1] 何卫锋[1] 李玉琴[1] 李伟[1] 李启鹏[1] 

机构地区：[1]空军工程大学工程学院,陕西西安710038

出　　处：《中国激光》2010年第10期2658-2661,共4页Chinese Journal of Lasers

基　　金：国防预研基金(5132701)资助课题

摘　　要：激光冲击强化(LSP)可以显著提高铸造镍基高温合金K417的抗疲劳强度。为提高K417在高温下的抗氧化和燃气腐蚀性能必须进行渗铝处理,研究了渗铝对K417激光冲击强化效果的影响。由残余应力在900℃保温的变化分析表明,虽然冲击后产生的残余压应力在高温下会部分释放,但是根据振动疲劳试验,激光冲击强化后材料疲劳强度为285.5 MPa,再渗铝后疲劳强度提高到339.5 MPa。结果表明,渗铝和激光冲击强化工艺可同时使用。Fatigue resistance on cast nickel-base superalloy K417 by laser shock processing（LSP） can be enhanced.Aluminizing is necessary in order to improve the oxidation resistance and fuel gas corrosion resistance.The impact of aluminizing on the LSP effects of K417 material is researched.According to the changes of residual stress in 900 ℃,although some of the residual compressive stress caused by LSP will be released,the experimental results show that the fatigue resistance of the sample by LSP is 285.5 MPa while that of the sample by alumetizing after LSP is 339.5 MPa.It is indicated that the LSP and the aluminizing can be used in the same process.

关 键 词：激光技术 激光冲击强化 渗铝 K417合金 疲劳强度 残余应力 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]