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Vol.45, No.6, 329 ~ 339, 2007
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| Title |
| The Prediction of Ms Considering Carbon Redistribution of Austenite in Hot Rolled Dual Phase Steels |
| 이상환 Sang Hwan Lee , 이창수 Chang Su Lee , 최종민 Jong Min Choi , 이경종 Kyung Jong Lee , 서석종 Seok Jong Seo |
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| Abstract |
| During the production of dual phase(DP) steels, intermediate phases such as acicular ferrite or upper bainite were frequently observed, which were very detrimental to the mechanical property of DP steels. The existence of undesirable phases could be adjusted by the enrichment and the redistribution of carbon in retained austenite after formation of polygonal ferrite during inter-critical annealing. In this study, the enrichment and the redistribution of carbon, which was a major strengthening factor, were measured by nano-hardness by changing holding time during inter-critical annealing. Indentation was conducted from center to near boundary of 2nd phases. The diffusion behavior of carbon during inter-critical annealing between DP steel and plain carbon steel was compared in order to understand the effect of Si on behavior of carbon and phase transformation. |
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| Key Words |
| dual phase steels, carbon enrichment, nano-indentation |
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