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고탄소강 온간공형압연의 초기조직에 따른 기계적 성질 고찰
오영석(Y. S. Oh),손일헌(I. H. Son),정경환(K. H. Jung),김동규(D. K. Kim),이덕락(D. L. Lee),임용택(Y. T. Im) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
It is well known that the ultrafine-grained steels, which guarantee both high strength and toughness, were manufactured by warm caliber rolling (WCR) owing to the continuous severe plastic deformation (SPD) technique. In this study, the effect of initial microstructure on the strength and toughness was investigated after WCR of the high carbon steel. The experiments were carried out with two kinds of starting microstructures. For comparison, the reference microstructure of austenite phase was prepared and assumed to be the case of conventional hot rolling. The experiments were conducted at the temperature of 500℃ and the accumulative reduction in area was about 83%. Based on this study, it was found that the product of WCR showed better mechanical properties in terms of strength and toughness compared to the conventional hot rolling. The improvement of strength and toughness was attributed to the grain refinement and delamination of lamellar structure consisting of ferrite and cementite, respectively.