Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Influence of High Temperature Deformation Process Variables on the Microstructure and Thermo-physical Properties of a Ni-Fe-Co Alloy

Fe-Ni-Co 합금의 고온 변형 공정 변수와 미세조직 및 열물리적 특성의 상관 관계

  • 윤동현 (재료연구소 융합공정연구본부) ;
  • 정중은 (POSTECH 신소재공학과) ;
  • 장영원 (POSTECH 신소재공학과) ;
  • 이정환 (재료연구소 산업기술지원본부) ;
  • 이광석 (재료연구소 융합공정연구본부)
  • Received : 2011.12.09
  • Accepted : 2012.02.07
  • Published : 2012.06.01
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Abstract

High temperature deformation behavior of a $Ni_{30}Fe_{53}Co_{17}$ alloy, with its extraordinary low coefficient of thermal expansion less than $10{\times}10^{-6}K^{-1}$ at temperatures ranging from room temperature to 673K, was investigated by conducting a series of compression tests. From an empirical processing map, the appropriate working temperature-strain rate combination for optimum forming was deduced to be in the ~1373K, $10^{-2}s^{-1}$ region. This region has a relatively high power dissipation efficiency, greater than 0.36. Furthermore, open die forging of a 100mm diameter billets was performed to confirm the variation of thermo-physical properties in relation to microstructure. The coefficient of thermal expansion was found to increase considerably with increasing the open die forging temperature and decreasing the cooling rate, which in turn provides a drastic increase in the average grain size.

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References

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