Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Analyses of Creep Properties of Ni-base Superalloy Powders as Cooling Rate after Solid Solution Heat Treatment

니켈기 초내열합금 분말의 고용화 열처리 후 냉각속도에 따른 크리프특성 분석

  • Jun, Chan (Materials Deformation Department, Korea Institute of Material Science (KIMS)) ;
  • Lee, Youngseon (Materials Deformation Department, Korea Institute of Material Science (KIMS)) ;
  • Bae, Byeong Beom (Materials Deformation Department, Korea Institute of Material Science (KIMS)) ;
  • Kim, Hong-Kyu (The 4th R&D Institute, Agency for Defense Development (ADD)) ;
  • Hong, Seong Suk (The 4th R&D Institute, Agency for Defense Development (ADD)) ;
  • Kim, Donghoon (The 4th R&D Institute, Agency for Defense Development (ADD)) ;
  • Yun, Jondo (Dept. of Nano Science and Engineering, Kyung Nam University) ;
  • Yoon, Eun Yoo (Materials Deformation Department, Korea Institute of Material Science (KIMS))
  • 전찬 (재료연구소 소재성형연구실) ;
  • 이영선 (재료연구소 소재성형연구실) ;
  • 배병범 (재료연구소 소재성형연구실) ;
  • 김홍규 (국방과학연구소) ;
  • 홍성석 (국방과학연구소) ;
  • 김동훈 (국방과학연구소) ;
  • 윤존도 (경남대학교 나노신소재공학과) ;
  • 윤은유 (재료연구소 소재성형연구실)
  • Received : 2016.05.18
  • Accepted : 2016.06.20
  • Published : 2016.06.28
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Abstract

In this study, solid solution heat treatment of consolidated nickel-based superalloy powders is carried out by hot isotactic pressing. The effects of the cooling rate of salt quenching, and air cooling on the microstructures and the mechanical properties of the specimens are analyzed. The specimen that is air cooled shows the formation of serrated grain boundaries due to their obstruction by the carbide particles. Moreover, the specimen that is salt quenched shows higher strength than the one that is air cooled due to the presence of fine and close-packed tertiary gamma prime phase. The tensile elongation at high temperatures improves due to the presence of grain boundary serrations in the specimen that is air cooled. On the contrary, the specimen that is salt quenched and consists of unserrated grain boundaries shows better creep properties than the air cooled specimen with the serrated grain boundaries, due to the negative creep phenomenon.

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References

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