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Characteristics of High Temperature Fatigue Fracture in Spring Steels after Shot Peening  

Park, Keyung-Dong (Department of Mechanical Engineering, Pukyong National University)
Shin, Yeong-Jin (Department of Mechanical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Safety / v.21, no.4, 2006 , pp. 1-6 More about this Journal
Abstract
The lightness of components that was required in automobile and machinery industry requires high strength of components. In particular, manufacturing process and new materials development for solving the fatigue facture problem attendant upon high strength of suspension of automobile are actively advanced. In this paper, the effect of compressive residual stress of spring steel(JISG SUP-9)by shot-peening on fatigue crack growth characteristics in high temperature($100^{\circ}C,\;150^{\circ}C,\;180^{\circ}C$)was investigated with considering fracture mechanics. So, we can obtaint the followings. (1) Compressive residual stress is decreased with increasing the test temperature. (2) The effect of compressive residual stress on fatigue crack growth behavior in high temperature is increased below ${\Delta}K=17{\sim}19MPa{\sqrt{m}}$. (3) It was investigated by SEM that the constraint of compress residual stress for plastic zone of fatigue crack tip was decreased in high temperature as compared with room temperature.
Keywords
compressive residual stress; fatigue crack propagation; spring steel; shot peened; striation;
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  • Reference
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