根据有关统计,大约有80%以上的结构强度破坏是由疲劳破坏造成的。而航空发动机零件由疲劳破坏造成的失效所占比例更大。航空发动机零件失效,大多数因强度失效、磨损失效和腐蚀失效等材料表面不能胜任苛刻工作条件所致,而且大多数发生在零件的表面和近表面,或者先从表面开始向内部扩散所致,进而显著影响发动机的性能与寿命。对零部件进行适度的表面强化或硬化,能阻止已有裂纹的扩 According to the statistics, about 80% of the structural damage is caused by fatigue damage. Aeroengine parts due to fatigue damage caused by a greater proportion of failures. Aeroengine parts failure, most of the failure due to strength, wear failure and corrosion failure and other materials surface can not be due to harsh working conditions, and most of the parts in the surface and near the surface, or from the surface to the internal diffusion, Which in turn significantly affects the performance and life of the engine. Part of the moderate surface hardening or hardening, can prevent the expansion of existing cracks