作　　者： ; ; ; ; ;

机构地区： 空军工程大学航空航天工程学院

出　　处： 《热加工工艺》 2008年第24期78-79,82,共3页

摘　　要： 对镍基高温合金(GH742)试件进行激光冲击强化处理,测量了合金在处理前后试样表面的残余应力、疲劳寿命,观察了表面金相组织。结果表明,激光冲击凹坑处的残余应力高达-910～-1160MPa;金相分析显示激光冲击强化使材料内部晶粒细化;激光冲击强化能提高GH742材料试件的疲劳寿命1.5～4倍。 The Ni-based superalloy （GH742） sample was processed by laser shock processing （LSP）, the residual stress, fatigue life of the sample were measured. The microstructure on the surface of the sample was observed. The results show that the compressive residual stress in the concave by LSP is about -910--1160 MPa. Metallographic analysis of the material after laser shock peening indicates that the grain refinement occurs. The fatigue life of shocked specimens is about 1.5 to 4 times higher than that of un-shocked ones.

关 键 词： 激光冲击强化 镍基高温合金 疲劳寿命

领　　域： [金属学及工艺] [金属学及工艺]