Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructural Evaluation and High Temperature Mechanical Properties of Ni-22Cr-18Fe-9Mo ODS Alloy

Ni-22Cr-18Fe-9Mo계 ODS 합금의 미세조직 및 고온인장 특성 평가

  • 정석환 (연세대학교 신소재공학과) ;
  • 강석훈 (한국원자력연구원 원자력재료개발부) ;
  • 한창희 (한국원자력연구원 원자력재료개발부) ;
  • 김태규 (한국원자력연구원 원자력재료개발부) ;
  • 김도향 (연세대학교 신소재공학과) ;
  • 장진성 (한국원자력연구원 원자력재료개발부)
  • Received : 2011.07.28
  • Accepted : 2011.09.28
  • Published : 2011.10.28
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Abstract

Yttrium oxide is one of the most thermo-dynamically stable materials, so that it is generally used as a dispersoid in many kinds of dispersion strengthed alloys. In this study, a nickel-base superalloy is strengthened by dispersion of yttrium oxide particles. Elemental powders with the composition of Ni-22Cr-18Fe-9Mo were mechanically alloyed(M.A.) with 0.6 wt% $Y_2O_3$. The MA powders were then HIP(hot isotactic press)ed and hot rolled. Most oxide particles in Ni-22Cr-18Fe-9Mo base ODS alloy were found to be Y-Ti-O type. The oxide particles were uniformly dispersed in the matrix and also on the grain boundaries. Tensile test results show that the yield strength and ultimate tensile strength of ODS alloy specimens were 1.2~1.7 times higher than those of the conventional $Hastelloy^{TM}$ X(R), which has the same chemical compositions with ODS alloy specimens except the oxide particles.

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References

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