研究Ｉｎｃｏｎｅｌ７１８镍基合金表面短裂纹在喷丸残余应力场中的扩展行为。用扫描电镜中的疲劳加载装置对表面裂纹的闭合行为进行原位观察和测量。研究表明，表面短裂纹具有较穿透短裂纹更低的扩展门槛值，表面短裂纹的闭合与残余压应力场的大小和分布密切相关，残余压应力场中的表面短裂纹扩展及形状变化完全可以通过其闭合行为的变化进行解释。 Inconel718 Ni-based alloy surface short cracks in the residual stress field of shot peening behavior. The surface crack closure behavior was observed and measured in situ using a fatigue loading device in SEM. The results show that the surface short crack has a lower threshold of expansion than the short through crack. The closure of the short crack surface is closely related to the size and distribution of the residual compressive stress field. The surface short crack propagation and shape change in the residual compressive stress field are completely It can be explained by the change in its closing behavior.