[Research Papers] Prediction Model for the Microstructure and Properties in Weld Heat Affected Zone : Ⅱ. Prediction Model for the Austenitization Kinetics and Austenite Grain Size Considering the Effect of Ferrite Grain Size in Fe - C - Mn Steel

Ryu, Jong-Geun; Moon, Joon-Oh; Lee, Chang-Hee; Uhm, Sang-Ho; Lee, Jong-Bong; Chang, Woong-Sung

Journal of KWJS 2006;24(1):77-87.
Published online April 3, 2006.

[연구논문] 용접 열영향부 미세조직 및 재질예측 모델링 : Ⅱ. Fe-C-Mn 강에서 페라이트 결정립크기의 영향을 고려한 Austenitization kinetics 및 오스테나이트 결정립크기 예측모델

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[Research Papers] Prediction Model for the Microstructure and Properties in Weld Heat Affected Zone : Ⅱ. Prediction Model for the Austenitization Kinetics and Austenite Grain Size Considering the Effect of Ferrite Grain Size in Fe - C - Mn Steel

Jong-Geun Ryu, Joon-Oh Moon, Chang-Hee Lee, Sang-Ho Uhm, Jong-Bong Lee, Woong-Sung Chang

Abstract

Considering ferrite grain size in the base metal, the prediction model for Ac₃ temperature and prior austenite grain size at just above Ac₃ temperature was proposed. In order to predict Ac₃ temperature, the Avrami equation was modified with the variation of ferrite grain size, and its kinetic parameters were measured from non-isothermal data during continuous heating. From calculation using a proposed model, Ac₃ temperatures increased with increasing ferrite grain size and heating rate. Meanwhile, by converting the phase transformation kinetic model that predicts the ferrite grain size from austenite grain size during cooling, a prediction model for prior austenite grain size at just above the Ac₃ temperature during heating was developed.