Cr-Mo계 금형강의 기계적 성질에 미치는 합금원소 및 템퍼링의 영향
공학 > 금속공학
김남규 ( Nam Kyu Kim ) , 김병옥 ( Byoung Ok Kim ) , 이오연 ( Oh Yeon Lee )
열처리공학회지 2012년, 제25권 제4호, 196~205쪽(총10쪽)
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    The purpose of this study is to enhance the hardenability and the mechanical properties by the addition of alloying elements such as Ni, Cr, Mo and B for the development of Cr-Mo plastic mold steel with uniform hardness and microstructure. The ingots were prepared by vacuum induction melting and forged to Φ35mm round bar. Forged bars were quenched and tempered at 200~600℃ for 1.5 hour. Jominy test, boron distribution observation, microstructual observation, tensile test and charpy impact test were conducted. It was confirmed that the hardenablity of these steels was improved by increasing of alloying elements and further promoted by the addition of boron. The critical rate of cooling required to obtain the bainitic structure for 0.27C-1.23Cr-0.28Mo-B steel was 0.5℃/sec. Hardness and strength of Cr-Mo steels decreased with increasing tempering temperature, but elongation and reduction of area increased with increasing tempering temperature. However, impact energy tempered at 400℃ showed the lowest value in the range 200∼600℃ due to the temper embrittlement.
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