Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Isothermal Transformation Behavior of 10% Cr Heat Resistant Steel Fabricated by Centrifugal Casting Process

원심주조법으로 제조된 10% Cr 내열강의 등온 변태 거동

  • Kim, J.E. (Daegu Mechatronics & Materrials Institute) ;
  • Lee, J.H. (Korea Institute of Materials Science (KIMS)) ;
  • Kim, D.H. (Korea Institute of Materials Science (KIMS)) ;
  • Yoo, W.D. (Korea Institute of Materials Science (KIMS)) ;
  • Lee, J.H. (Dept. of Mat. Sci. & Eng., Changwon National Univ.)
  • Received : 2014.01.03
  • Accepted : 2014.01.22
  • Published : 2014.03.30
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Abstract

Isothermal transformation behavior of a 10% Cr heat resistant steel fabricated by centrifugal casting process was investigated. Normalized specimen at $1100^{\circ}C$ for 1 hour was isothermally annealed at temperature range between $600^{\circ}C$ and $700^{\circ}C$ with various time. The annealed specimen had eutectoid structure which was generated along austenitic grain boundary during isothermal annealing. Areal fraction of eutectoid structure increased up to 25% after holding at $700^{\circ}C$ for 20 hours. It was observed that austenitic matrix was transformed to ferrite structure and fine $M_{23}C_6$ carbides with increase of annealing time. Time-temperature-transformation diagram of the centrifugally cast 10% Cr steel with 0.18 wt% C was plotted based on the results of isothermal transformation behavior.

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References

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