Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Development of a Cast Tool Steel with Excellent Performance for Application to Cold-Work Press Dies

냉간프레스금형용 고성능 주강 개발

  • 강전연 (한국기계연구원 부설 재료연구소) ;
  • ;
  • 김병환 (한국기계연구원 부설 재료연구소) ;
  • 김호영 (주식회사 센트랄, 재료연구팀)
  • Received : 2018.09.28
  • Accepted : 2018.10.15
  • Published : 2018.11.30
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Abstract

The microstructure of a newly developed alloy tool steel (KV1) for casting cold-work press dies was analyzed using advanced scanning electron microscopy. Its mechanical properties and durability in use as piercing inserts were tested. It contained a continuous network structure which originated from the micro-segregation during solidification and was composed of retained austenite and primary carbides. However, after quenching and tempering, its continuity was destroyed due to the decomposition of austenite. The discontinuous spatial distribution and the smaller amount of primary carbide in the network presented KV1 enhanced ductility compared to the common alloy (HK700). The reduced C and Cr, the addition of V resulted in a small amount of primary carbides which primarily consisted of MC, as well as fine and uniform dispersion of precipitates. Owing to these features, KV1 exhibited delayed initiation of chipping when used for piercing inserts.

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