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Journal of KWJS. 2006;24(4):39-49. Published online October 16, 2006.
- 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
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Sang-Ho Uhm, Joon-Oh Moon, Hong-Chul Jeong, Jong-Bong Lee, Changhee Lee
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- 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.
Keywords :Austenite grain growth;Heat Affected Zone;Modelling
