Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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A Study on the High Temp. Tensile Properties of B1914 Ni-base Superalloy According to Crystal Structures of Poly-, Directionally Solidified- and Single Crystal Casts

Ni기 초합금 B1914의 다결정, 방향성 및 단결정 주조구조에 따른 고온 인장 특성 연구

  • An, Seong-Uk (Division of Metals, Korea Institute of Science and Technology) ;
  • Jang,Yong-Seok (Department of Materials Science, Korea University) ;
  • Yun, Dong-Han (Division of Metals, Korea Institute of Science and Technology) ;
  • Im, Ok-Dong (Division of Metals, Korea Institute of Science and Technology) ;
  • Larionov, V. (Division of Metals, Korea Institute of Science and Technology) ;
  • Grafas, I. (Division of Metals, Korea Institute of Science and Technology) ;
  • Jin, Yeong-Hun (Division of Metals, Korea Institute of Science and Technology) ;
  • Lee, Jae-Hun (R & D Center, Hankook Tier Co,. LTD.) ;
  • Seo, Dong-Lee (Department of Material Science and Mechanics, Michigan State University) ;
  • O, Je-Myeong (Material & Corrosion Research lab. Korea Electric Power Research Institute) ;
  • Lee, Sang-Jun (Metallurgy Lab., National Institute of Technology and Quality) ;
  • Lim, Dae-Soon (Department of Materials Science, Korea University)
  • 안성욱 (한국과학기술연구원 금속연구부) ;
  • 장용석 (고려대학교 재료공학과) ;
  • 윤동한 (한국과학기술연구원 금속연구부) ;
  • 임옥동 (한국과학기술연구원 금속연구부) ;
  • ;
  • ;
  • 진영훈 (한국과학기술연구원 금속연구부) ;
  • 이재훈 (한국타이어 중앙연구소) ;
  • 서동이 (미시간주립대학 재료공학과) ;
  • 오제명 (전력연구원 재료부식연구소) ;
  • 이상준 (국립기술품질원 기계금속부) ;
  • 임대순 (고려대학교 재료공학과)
  • Published : 1998.09.01
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Abstract

The B1914 Ni-base superalloy was manufactured according to crystal structures of poly-, directionally solidified- and single crystals. We observe deformation as type of different crystal structure from room to high temperature. Specimens are controled by cooling rate and thermal gradient and then heat treatment in vacuum and then cooling with Ar gas. Different crystal structure has different stress-strain characteristic. At $600^{\circ}C$, yield strength and ultimate strength is increased single-, directionally solidified- and poly crystals in order.

Ni기 초합금인 B1914로 다결정, 방향성 및 단결정을 제조하여, 상온과 고온에서 이들 결정종류에 따른 변형을 관찰하였다. 이들 결정을 제작하기 위하여 진공 주조로에서 냉각속도와 온도구배를 제어하였으며, 제작된 봉상 시편들은 2단계의 진공열처리를 하고 아르곤가스로 급냉하였다. 동일한 모합금인 B1914로 제조된 결정들은 결정종류에 따라서 뚜렷한 변형(stress-strain)을 나타내었다. 즉, 항복강도와 인장강도는 다결정, 방향성 및 단결정 순으로 뚜렷이 증가하였다. 또한 $600^{\circ}C$에서 모든 결정들은 $\gamma$'의 강화효과로 인해서 가장 높은 741-816MPa의 항복강도를 나타내었으며, 인장강도는 1005-1139MPa이었다.

Keywords

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