발간논문

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Vol.30, No.10, 1218 ~ 1227, 1992
Title
Effect of Heating Temperature and Cooling Rate on the Tensile Properties of Medium Carbon Micro - alloyed Steel for Hot Foring
심재진Jae Jin Shim, 이준희Jun Hee Lee, 이상윤Sang Yun Lee
Abstract
The effects of heating temperature and cooling rate on the tensile properties of continuously air cooled medium carbon micro-alloyed steels have been investigated. Transformation start temperature measured from inflection point of cooling curves has been found to decrease with increasing heating temperature and cooling rate and to be more sensitive to Mn contents when cooling rate is fast. Prior austenite grain size has been measured to abnormally grow in the range of 1050℃∼1150℃ and rapidly grow above 1150℃. It has been found that proof strength and tensile strength increase with increasing heating temperature and increase with increasing cooling rate up to 250℃/min. and remain relatively unchanged in the range of 250℃∼400℃/min. The regression equations for proof strength and tensile strength have beer, calculated by using the multi-regression analysis package and it is expected to be useful for the prediction of tensile properties of air cooled mudium carbon micro-alloyed steels.
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