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The Effects of Cyclic Heat Treatment Process for Fine Microstructure of TiAl Cast Alloy

주조용 TiAl 합금의 조직 미세화를 위한 반복열처리 공정 조건에 관한 연구

  • Kong, Man-Sik (Advanced Materials & Processing Center, Institute for Advanced Engineering) ;
  • Yang, Hyunseok (Advanced Materials & Processing Center, Institute for Advanced Engineering)
  • 공만식 (고등기술연구원 신소재공정센터) ;
  • 양현석 (고등기술연구원 신소재공정센터)
  • Received : 2019.08.14
  • Accepted : 2019.09.16
  • Published : 2019.09.30

Abstract

For expanding the applications and workability of TiAl alloy, elongation is very important property. Fine microstructure is needed for elongation and physical properties of TiAl alloys. In this study, The effects of cyclic heat treatment process for fine microstructure of Ti-46Al-Nb-W-Cr-Si-C alloy, which was made by VAR (vacuum arc remelting) and VIM(vacuum induction melting) centrifugal casting process, was investigated. Cycle heat treatment process was very effective for recrystallization of this TiAl system, which has microstructure size of $50{\sim}100{\mu}m$ through pre-heat treatment, cyclic heat treatment in ${\alpha}+{\gamma}$ phase region and solution heat treatment respectively. Refined grain size was finally confirmed by photos of optical microscope and scanning electron microscope.

Acknowledgement

Supported by : 방위산업기술지원센터

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