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Effect of Shot Peening on Fatigue Life of Heat Treated Spring Steel  

Lee, Seung-Ho (Department of Automobile, Kyonggi Institute of Technology)
Shim, Dong-Suk (Department of Automobile, Kyonggi Institute of Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.17, no.6, 2004 , pp. 336-341 More about this Journal
Abstract
The effect of shot peening conditions on the fatigue properties of heat-treated spring steel has been investigated by using residual stress measurement and metallography. The mechanical properties of material did not change so much by shot peening. However, the fatigue strength and fatigue life increased about 20% to 40% by 1-step and 2-step shot peening process. The fatigue strength and life were closely related to the value and position of maximum compressive residual stress by shot peening process. In the case of warm shot peening, compressive residual stress of specimens shot peening processed at $200^{\circ}C$ was higher than those of specimens shot peening processed at room temperature, $100^{\circ}C$ and $300^{\circ}C$.
Keywords
Heat treated spring steel; 2-step shot peening; Compressive residual stress; Warm shot peening; Fatigue life; Fatigue strength;
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  • Reference
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