발간논문

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Vol.35, No.12, 1602 ~ 1609, 1997
Title
Influence of Carbon Content on the Austenite Grain Growth of Ti-microalloyed Steels
허태형 , 박지용 , 박중근 , 조웅용 T . H . Huh , J . Y . Park , J . K . Park , W . Y . Choo
Abstract
The influence of carbon content on the austenite grain growth of Ti-microalloyed C-Mn steels during reheating to the austenite region has been studied using optical microscope and transmission electron microscope. The austenite grain coarsening temperature(GCT) particulary at the center of slab decreases as the carbon content increases from 0.09wt% to near peritectic composition(0.16wt.%). This is believed to arise from the effect of carbon content as the segregation behavior of the interdendritic region! The degree of segregation is distinctively small in low carbon steel because of two simultaneous effects, namely the faster diffusion rate and shorter diffusion length. This is because of dendrite formation mechanism differs depending on the carbon content. The austenite grain size during reheating is observed to be distinctively small in the case of low carbon steel. This is due to the fact that the upper temperature for the austenite single phase region is comparatively low in the case of low carbon steel.
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