Abstract One of the traditional methods used to improve the fatigue properties of metallic materials is shot peening. More recently, cavitation peening, in which the surface is treated using cavitation impact, has been developed, and the improvements this makes to the fatigue life and the strength of metallic materials have been reported. In order to clarify the difference between these two methods, stainless steel SUS316 L samples were treated by shot peening and cavitation peening, and the fatigue properties of the samples were evaluated utilizing a displacement controlled plane bending fatigue test. The residual stress and hardness before and after the fatigue test were measured, and the surface roughness of each specimen was also measured. It was concluded that the fatigue life of shot peened specimens at bending stress σa > 450 MPa was longer than that of cavitation peened specimens; however, the fatigue strength of the cavitation peened specimens was slightly larger than that of the shot peened specimens. The compressive residual stress introduced by both peening methods decreased during the fatigue test. The reduction in the compressive residual stress in the shot peened specimens was greater than in the cavitation peened specimens, and after the fatigue test, the compressive residual stress in the shot peened specimens was greater than that in the cavitation peened specimens. It was found that the fatigue strength corresponded well with the yield stress estimated from the Vickers hardness corrected by the residual stress obtained after the fatigue test.

中文翻译：

---

空化和喷丸引入残余压应力对提高不锈钢疲劳强度的影响

摘要 提高金属材料疲劳性能的传统方法之一是喷丸强化。最近，已经开发了空化喷丸，其中使用空化冲击处理表面，并且已经报道了这对金属材料的疲劳寿命和强度的改进。为阐明这两种方法的区别，对不锈钢SUS316 L试样进行喷丸强化和空化强化处理，并利用位移控制平面弯曲疲劳试验对试样的疲劳性能进行评价。测量疲劳试验前后的残余应力和硬度，并测量每个试样的表面粗糙度。得出的结论是，喷丸试样在弯曲应力 σa 下的疲劳寿命 > 450 MPa 比空化喷丸试样长；然而，空化强化试样的疲劳强度略大于喷丸强化试样的疲劳强度。在疲劳试验期间，两种喷丸方法引入的压缩残余应力都降低了。喷丸强化试样的残余压缩应力下降幅度大于空化强化试样，疲劳试验后，喷丸强化试样的残余压缩应力大于空化强化试样。发现疲劳强度与由疲劳试验后获得的残余应力校正的维氏硬度估计的屈服应力很好地对应。空化强化试样的疲劳强度略大于喷丸强化试样的疲劳强度。在疲劳试验期间，两种喷丸方法引入的压缩残余应力都降低了。喷丸强化试样的残余压缩应力下降幅度大于空化强化试样，疲劳试验后，喷丸强化试样的残余压缩应力大于空化强化试样。发现疲劳强度与由疲劳试验后获得的残余应力校正的维氏硬度估计的屈服应力很好地对应。空化强化试样的疲劳强度略大于喷丸强化试样的疲劳强度。在疲劳试验期间，两种喷丸方法引入的压缩残余应力都降低了。喷丸强化试样的残余压缩应力下降幅度大于空化强化试样，疲劳试验后，喷丸强化试样的残余压缩应力大于空化强化试样。发现疲劳强度与由疲劳试验后获得的残余应力校正的维氏硬度估计的屈服应力很好地对应。喷丸强化试样的残余压缩应力下降幅度大于空化强化试样，疲劳试验后，喷丸强化试样的残余压缩应力大于空化强化试样。发现疲劳强度与由疲劳试验后获得的残余应力校正的维氏硬度估计的屈服应力很好地对应。喷丸强化试样的残余压缩应力下降幅度大于空化强化试样，疲劳试验后，喷丸强化试样的残余压缩应力大于空化强化试样。发现疲劳强度与由疲劳试验后获得的残余应力校正的维氏硬度估计的屈服应力很好地对应。