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A Effect of Shot Peening for Fatigue Life of Spring Steel for Vessel Application  

Ryu Hyung-Ju (부경대학교 대학원 기계공학부)
Park Keyung-Dong (부경대학교 기계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.29, no.4, 2005 , pp. 426-435 More about this Journal
Abstract
The lightness of components required in automobile and machinery industries is requiring high strength of components. Therefore this requirement is accomplished as the process of shot-peening method that the compressive residual stress is made on the metal surface as one of various improvement methods. Special research is, therefore, needed about compressive residual stress on the metal surface in the process of shot-peening method. Therefore, in this paper the effect of compressive residual stress of spring steel(JISG SUP-9) by shot-peening on fatigue crack growth characteristics in environmental condition(temperature) and mechanical condition(shot velocity, stress ratio) was investigated with considering fracture mechanics. By using the methods mentioned above, the following conclusions have been drawn. (1) The fatigue crack growth rate(da/dN) of the shot-peened material was lower than that of the un-peened one. In high temperature range. fatigue crack growth rate decreased with increasing temperature range, while fatigue crack growth rate increased by decreasing temperature in low temperature. (2) Fatigue life shows more improvement in the shot-peened material than in the un-peened material. And compressive residual stress of surface on the shot-peen processed operate resistance force of fatigue crack propagation.
Keywords
Shot peening; Fatigue crack growth rate; Shot velocity; Stress ratio; Environmental condition; Threshold stress intensity factor;
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