Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Carbide Behavior in STD11 Tool Steel during Heat Treatment

STD11 공구강의 열처리 온도에 따른 탄화물 거동

  • 홍기정 (포항산업과학연구원 분석평가센터) ;
  • 송진화 (POSCO 기술연구원 STS공정연구그룹) ;
  • 정인상 (경북대학교 신소재공학부)
  • Received : 2011.06.25
  • Accepted : 2011.07.20
  • Published : 2011.09.30
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Abstract

Carbide precipitation and dissolution behavior at various temperatures during heat treatment has been studied in STD11 cold working die steel through confocal scanning laser microscopy; dilatometry; and X-ray diffraction analysis. The equilibrium phase diagram and phase fractions with temperature were calculated using a FactSage program. Confocal laser microscopic observation revealed that ${\alpha}$ to ${\gamma}$ transformation temperature is near $800^{\circ}C$; M7C3 carbides melt at $1245^{\circ}C$; and the melting temperature of STD11 is near $1370^{\circ}C$. XRD results indicated that the M23C6 carbides dissolve in the matrix if austenitized at over $1030^{\circ}C$; while the M7C3 carbides remain up to $1200^{\circ}C$ although their amount decreases. The calculated equilibrium phase diagram showed good agreement with experimental results on carbide dissolution and phase transformation temperatures.

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References

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