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Vol.43, No.6, 443 ~ 449, 2005
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| Title |
| Mechanical Behavior : A Study on Development of C-Mn-Si Based High Strength Steels for Cold Forming Bolt |
| 주기운 Gi Woon Ju , 최일동 Il Dong Choi , 이창길 Chang Gil Lee , 김성준 Sung Joon Kim |
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| Abstract |
| In this study, C-Mn-Si based high strength steels for cold forming bolt with the range of 0.15-0.25%C and 1.5-2.0%Mn were designed to reduce C and Si and the effect of alloying elements on microstructures and mechanical properties have been studied. Microstructural observation, tensile test, Charpy impact test, and fatigue test were conducted. Microsructures were changed from bainite+pearlite to martensite+bainite with increasing carbon and manganese. Strength and yield ratio were increased, elongation, reduction of area and impact energy were decreased with increasing carbon and manganese. The fatigue life of Fe-C-Mn-Si steels was 3~5 times longer than conventional machine structural steel (S45C) tested with mean stress of 50% tensile strength |
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| Key Words |
| Cold forming, Microstructure, Alloying element, Fatigue Life, Mechanical properties |
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