발간논문

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Vol.28, No.12, 1040 ~ 1048, 1990
Title
The Influence of the Prior Austenite Grain Size on the Bainitic Transformation Start
김영희Young Hee Kim, 한봉희Bong Hee Hahn
Abstract
A relationship has been establish between the prior austenite grain size and the bainite transformation start temperature (BTST) during air cooling for low carbon Mn1/2Mo-B steels. It has been found from the experiment that the BTST usually increase with austenitizing temperature. An abrupt increase in the BTST was observed when particularly austenitized in the austenitizing temperature range of between 975℃ and 1000 ℃. The temperature dependence of the BTST appeared to be the same as the grain growth behavior of prior austenite. It has therefore been shown that the BTST has a close relationship with the grain growth characteristics of prior austenite and that it is lowered in steels with fine grain sizes during austenitization, being further lowered by the addition of Mn. Consequently, this study has been performed to qualitatively discuss some reasonable explanations for these phenomena.
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