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이태경(T. Lee),박성혁(S. H. Park),이덕락(D. L. Lee),이종수(C. S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Microstructural evolution and the mechanical properties of various carbon steels were investigated with the variation deformation temperature to explore the optimum microstructure with excellent combination of strength and ductility. For this purpose, three carbon steels containing different carbon contents were deformed using Gleeble 3500 at temperatures including austenitic, austenitic/ferritic, austenitic/cementitic, ferritic/cementitic regions. The results showed that in the medium and high carbon steels, cementite particles became finer with decreasing deformation temperature resulting higher hardness but lower ductility. Further effort is needed to find out optimum microstructures with enhanced mechanical properties.
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.