Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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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

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

  • 유종근 (한양대학교 신소재공학과) ;
  • 문준오 (한양대학교 신소재공학과) ;
  • 이창희 (한양대학교 신소재공학과) ;
  • 엄상호 (포스코 기술연구소 접합연구 그룹) ;
  • 이종봉 (포스코 기술연구소 접합연구 그룹) ;
  • 장웅성 (포항산업과학연구원 용접센터)
  • Published : 2006.02.01
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Abstract

Considering ferrite grain size in the base metal, the prediction model for $A_{c3}$ temperature and prior austenite grain size at just above $A_{c3}$ temperature was proposed. In order to predict $A_{c3}$ 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, $A_{c3}$ 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 $A_{c3}$ temperature during heating was developed.

Keywords

References

  1. F. Fernandes, S. Denis and A. Simon: Mem. Etud. Sci. Rev. Metall., 83 (1986), 355
  2. J. B. Leblond and J. Devaux: Acta Metall., 32 (1984), 137 https://doi.org/10.1016/0001-6160(84)90211-6
  3. Joonoh Moon, Changhee Lee: Journal of KWS, 23-4 (2005), 17(in Korean)
  4. Sangho Uhm, Joonoh Moon, Changhee Lee et al.: Prediction Model for the Austenite Grain Size in the Coarse Grained Heat Affected Zone of Fe C Mn Steels: Considering the Effect of Initial Grain Size on Isothermal Growth Behavior., ISIJ international, 44 (2004), 1230 https://doi.org/10.2355/isijinternational.44.1230
  5. W. A. Johnson and R. F. Mehl: Trans. AIME, 125 (1939), 416
  6. M. Avrami: J. Chem. Phy., 7(1939), 1103 https://doi.org/10.1063/1.1750380
  7. S. Denis, D. Farias and A. Simon: Mathematical model coupling phase transformations and temperature Evolutions in Steels
  8. K. Easterling: Introduction to the Physical Metallurgy of welding, Butterworths, London, 1983, 104- 55
  9. C.R. Brook: Principles of the Austenization of Steels, Elsevier Applied Science, 1992, 145-9
  10. D.A. Porter and K.E. Easterling: Phase Transformation s in Metals and Alloy s . Chapman & Hall. 1992, 2nd ed., 287- 90
  11. M. Suehiro, K. Sato, Y. Tsukano: Computer Modeling of Microstructural change and Strength of Low Carbon Steel in 4. Hot Strip Rolling, Transactions ISIJ, 27, (1987)
  12. E. Scheil: Arch. Eisenhuettenwes, 8 (1935), 565
  13. M. Umemoto et al.: Effect of cooling rate on grain size of ferrite in a carbon steel. The Institute of Metals, 3 (1087), 249-255
  14. M. Umemoto: Control and Prediction of Structure and Property. ISIJ, Tokyo. Japan, (1988), 105
  15. J. W. Cahn: Acta Metall., 4 (1956), 449 https://doi.org/10.1016/0001-6160(56)90041-4
  16. J. W. Christian: The Theory of Transformations in Metals and Alloys, Pergamon. (1983)
  17. M. Umemoto: Control and Prediction of Structure and Property, ISIJ, Tokyo, Japan, (1988), 105
  18. M. Umemoto, K. Horiuch and I. Tamura: Trans. ISIJ, 22(1982), 855
  19. M. Umemoto, N. Komatsubara and I. Tamura: J. Heat Treating, 1 (1980), 57 https://doi.org/10.1007/BF02833039