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Effect of Shot Peening on the Fatigue of SS400 Weldments  

Kim, Jin-Hern (서울메트로, 군자차량사무소)
Goo, Byeong-Choon (한국철도기술연구원, 철도구조연구실)
Kim, Hyun-Gyu (서울산업대학교, 기계공학과)
Cheong, Seong-Kyun (서울산업대학교, 기계공학과)
Publication Information
Journal of the Korean Society for Railway / v.12, no.6, 2009 , pp. 895-901 More about this Journal
Abstract
Fatigue fracture of the welded joints of bogie frames is one of unsolved problems. To improve the fatigue strength of the welded joints, various techniques have been applied. In this study, we have investigated the effect of shot peening on the fatigue characteristics of SS400 welded specimens. The fatigue lives of four kinds of welded specimens were examined; welded, PWHT, shot peened, and shot peened after PWHT. The results of the fatigue tests show that the fatigue limit of the shot-peened specimens is higher than that of the welded specimens, and the PWHT specimens have a lower fatigue limit than the welded specimens. It was found that shot peening is a very effective method to improve the fatigue strength of SS400 welded joints.
Keywords
SS400; Shot peening; PWHT; Welding; Fatigue;
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Times Cited By KSCI : 5  (Citation Analysis)
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