Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Mechanisms of Tensile and Creep Deformation at Elevated Temperatures in a Ni-Base Superalloy Alloy 263

니켈기 초내열합금 Alloy 263의 고온인장 및 크리프 변형기구

  • Kim, In Soo (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Choi, Baig Gyu (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Hong, Hyun Uk (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Jo, Chang Yong (High Temperature Materials Research Group, Korea Institute of Materials Science)
  • 김인수 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 최백규 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 홍현욱 (한국기계연구원 부설 재료연구소 내열재료연구그룹) ;
  • 조창용 (한국기계연구원 부설 재료연구소 내열재료연구그룹)
  • Received : 2011.03.10
  • Published : 2011.07.25
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Abstract

The tensile and creep behaviors of Alloy 263, which is a wrought Ni-base superalloy used for gas turbine combustion systems, was studied. Anomalous increase of yield strength and abrupt decrease of elongation with increasing temperature were observed after tensile testing at an intermediate temperature. Elongation of the superalloy decreased as the temperature increased to and above 540$^{\circ}C$, and it reached a minimum value at 760$^{\circ}C$. It was found that creep strain was also very low at the same temperature. Inhomogeneous deformation with intensive slip bands was observed in the specimens tested at low temperature. A thermally-assisted dislocation climb process was regularly conducted at high temperature. Twinning was found to be an important mechanism of both tensile and creep deformations of the superalloy at an intermediate temperature where ductility minimum was observed.

Keywords

Acknowledgement

Supported by : 지식경제부, 재료연구소

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