Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Microstructures and Mechanical Properties of Cold-Work Tool Steels: A Comparison of 8%Cr Steel with STD11

냉간금형강의 미세조직과 기계적 특성: STD11과 8%Cr 강의 비교

  • Kim, Hoyoung (Department of Materials Science and Engineering, Pusan National University) ;
  • Kang, Jun-Yun (Korea Institute of Materials Science) ;
  • Son, Dongmin (POSCO Specialty Steel) ;
  • Lee, Dae Soo (POSCO Specialty Steel) ;
  • Lee, Tae-Ho (Korea Institute of Materials Science) ;
  • Jeong, Woo Chang (School of Mechanical and Automotive Engineering, Catholic University of Daegu) ;
  • Cho, Kyung-Mox (Department of Materials Science and Engineering, Pusan National University)
  • 김호영 (부산대학교 재료공학과) ;
  • 강전연 (한국기계연구원 부설 재료연구소) ;
  • 손동민 (포스코특수강) ;
  • 이대수 (포스코특수강) ;
  • 이태호 (한국기계연구원 부설 재료연구소) ;
  • 정우창 (대구가톨릭대학교 기계자동차공학부) ;
  • 조경목 (부산대학교 재료공학과)
  • Received : 2014.08.25
  • Accepted : 2014.09.18
  • Published : 2014.09.30
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Abstract

A comparative study was performed on the microstructures and the mechanical properties of STD11 and 8Cr steel. The specimens were quenched from $1030^{\circ}C$ and tempered at $240^{\circ}C$ and $520^{\circ}C$. Vickers hardness, impact toughness and tensile tests were conducted at various tempering temperatures. Microstructural characterization to measure grain size, volume fraction of retained austenite and distribution of carbides was carried out by using SEM, EBSD, TEM and X-ray diffraction techniques. Due to finer $M_7C_3$ carbides dispersed, 8Cr steel showed larger impact toughness and plasticity than STD11 irrespective of the tempering temperature. While 8Cr steel had lower hardness in as-quenched state and after tempering at $240^{\circ}C$ owing to smaller carbide content and more retained austenite, it was harder after tempering at $520^{\circ}C$ due to larger precipitation hardening from finer $M_{23}C_6$.

Keywords

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