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Journal of KWJS 2006;24(4):39-49.
Published online October 16, 2006.
용접 열영향부 미세조직 및 재질 예측 모델링 : Ⅲ. 석출물 - Free 저합금강의 초기 오스테나이트 결정립크기의 영향을 고려한 용접 열영향부 오스테나이트 결정립성장 예측 모델
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Prediction Model for the Microstructure and Properties in Weld Heat Affected Zone: Ⅲ. Prediction Model for the Austenite Grain Growth Considering the Influence of Initial Austenite Grain Size in Weld HAZ of Precipitates Free Low Alloyed Steel
Sang-Ho Uhm, Joon-Oh Moon, Hong-Chul Jeong, Jong-Bong Lee, Changhee Lee
Abstract
  The austenite grain growth model in low alloyed steel HAZ without precipitates was proposed by analyzing isothermal grain growth behavior. Steels used in this study were designed to investigate the effect of alloying elements. Meanwhile, a systematic procedure was proposed to prevent inappropriate neglect of initial grain size (D0) and misreading both time exponent and activation energy for isothermal grain growth. It was found that the time exponent was almost constant, irrespectively of temperature and alloying elements, and activation energy increased with the addition of alloying elements. From quantification of the effect of alloying elements on the activation energy, an isothermal grain growth model was presented. Finally, combining with the additivity rule, the austenite grain size in the CGHAZ was predicted.
Key Words: Austenite grain growth, Heat Affected Zone, Modelling
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