열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제24권6호
  • /
  • Pages.327-337
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  • 2011
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  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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AISI 51B20강의 인장 및 충격특성에 미치는 오스테나이트화 온도와 퀜칭·템퍼링 온도의 영향

Effect of Austenitizing and Quenching·Tempering Temperatures on Tensile and Impact Properties of AISI 51B20

  • 김헌주 (부경대학교 공과대학 금속공학과)
  • Kim, Heon-Joo (Dept. of Metallurgical Engineering, Pukyong National University)
  • 투고 : 2011.09.18
  • 심사 : 2011.11.02
  • 발행 : 2011.11.30
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초록

Effects of microstructural change, tensile properties and impact property according to the change of austenitizing temperature and tempering temperature of AISI 51B20 steel were examined. Regardless of austenite grain size, lath martensite with needle and packet shapes was found at tempering temperature of $300^{\circ}C{\sim}400^{\circ}C$. The needles of lath martensite changed to parallel packet at tempering temperature of $450^{\circ}C{\sim}600^{\circ}C$. As tempering temperature increased, tensile strength, yield strength and hardness decreased, while elongation, ratio of reduction area and Charpy impact energy increased. Grain size increased when quenching temperature was $930^{\circ}C$. Grain size had prominent effect on the mechanical properties of AISI 51B20 steel. Ratio of tensile strength/yield strength and yield strength autenitized at $880^{\circ}C$ followed by tempering at $350^{\circ}C{\sim}450^{\circ}C$ showed higher values than that of autenization at $930^{\circ}C$ due to fine grain size.

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