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논문 기본 정보

자료유형
학술저널
저자정보
김상훈 (한양대학교) 문준오 (한양대학교) 이윤기 (한양대학교) 정홍철 (POSCO) 이창희 (한양대학교)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第28卷 第3號
발행연도
2010.6
수록면
104 - 113 (10page)

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In this study, to predict the microstructure in weld HAZ of low alloyed steel, prediction model for the phase transformation considering the influence of prior austenite grain size and cooling rate was developed. For this study, six low alloyed steels were designed and the effect of alloying elements was also investigated. In order to develop the prediction model for ferrite transformation, isothermal ferrite transformation behaviors were analyzed by dilatometer system and ‘Avrami equation’ which was modified to consider the effect of prior austenite grain size. After that, model for ferrite phase transformation during continuous cooling was proposed based on the isothermal ferrite transformation model through applying the ‘Additivity rule’. Also, start temperatures of ferrite transformation were predicted by A<SUB>r3</SUB> considering the cooling rate. CCT diagram was calculated through this model, these results were in good agreement with the experimental results. After ferrite transformation, bainite transformation was predicted using Esaka model which corresponded most closely to the experimental results among various models. The start temperatures of bainite transformation were determined using K. J. Lee model. Phase fraction of martensite was obtained according to phase fractions of ferrite and bainite.

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UCI(KEPA) : I410-ECN-0101-2010-581-003158755