온간 쇼트피닝에 의한 압축잔류응력의 변화

• Published in: Biuletyn Uniejowski Vol. 37; no. 5; pp. 273 - 278
• Main Authors: 이승호(Seung-Ho Lee), 심동석(Dong-Suk Shim), 김기전(Gi-Jeon Kim)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2004
• Subjects: Warm Shot Peening(온간 쇼트 피닝); Compressive Residual Stress(압축잔류응력); Fatigue Life(피로수명); Fatigue Strength(피로강도); Spring Steel(스프링강)
• ISSN: 1225-8024; 2299-8403

The requirements of getting spring steel with higher fatigue strength have been increased to achieve the weight reduction of a vehicle. As the possible increment in fatigue strength by using the conventional shot peening treatment is found to be limited, it is necessary to modify the shot peening treatment. In this study, to investigate the effects of warm shot peening on increasing fatigue strength, tests are conducted on spring steel SAE9524. By the results of rotating bending fatigue tests, the fatigue strength increases up to 23.8% in warm shot peening specimens at $200^{\circ}C$ compared with conventional shot peening. The major reason why the warm shot peening is effective to the improvement of fatigue strength is the increment of the compressive residual stress, which can be effectively formed by shot peening under the condition of warm temperature than room temperature.