발간논문

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Vol.37, No.12, 1544 ~ 1550, 1999
Title
HAZ Characteristics of Grain - Refined Ferrite - Pearlite Steels ( 1 ) - Variation of HAZ Microstructures with Welding Conditions
방국수Kook Soo Bang,박봉규Bong Gyu Park,정호경Ho Kyong Jeong
Abstract
The effect of ferrite grain refinement on the heat-affected zone microstructural evolution was investigated using grain-refined ferrite-pearlite steel with ferrite grain size of 4㎛. HAZ austenite grain size and microstructure volume fractions were measured and compared them with normal steels. An established theoretical model for the prediction of HAZ microstructures of normal steels was modified for grain-refined steels. Ferrite grain refinement resulted in smaller HAZ austenite size. Compared to 320㎛ of normal steels, grain-refined steels showed only 104㎛ at the welding condition of T_p 1350℃-△t 20s for example. Variation of austenite size with welding conditions can be predicted reasonably well when the initial austenite size of grain-refined steels is 9㎛. It was shown that the established Johnson-Mehl type model was also applicable to grain-refined steel when correctional factor due to grain refinement was incorporated in it. Measured and calculated values showed a good agreement when the correctional factor was 0.5.
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