Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Properties of Nimonic 80A Alloy with Change in the Chemical Compositions and Heat Treatment Paths

화학조성 및 열처리경로 변화에 따른 Nimonic 80A 합금의 특성

  • Choi Byong-Kang (Dept. of Applied-Advanced Materials Chunchon Polytechnic College) ;
  • Jeong Hae-Yong (Dept. of Materials Sci. & Eng., Pukyong National University) ;
  • Bae Cha-Hurn (Dept. of Materials Sci. & Eng., Pukyong National University)
  • 최병강 (춘천기능대학 신소재응용과) ;
  • 정해용 (부경대학교 재료공학과) ;
  • 배차헌 (부경대학교 재료공학과)
  • Published : 2005.12.01
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Abstract

Properties of Ni-base superalloys of Nimonic 80A alloy system were investigated by the observation of microstructures, precipitates ana hardness as a function of the chemical compositions ana the paths of heat treatment. The higher hardness values showed, the higher Ti/Al ratio among high compositions of Cr and Co element. The lower (Ti+Al) and Fe contents decreased in the same Ti/Al ratio, the higher hardness values showed. This results are considered that coherent deformation was increased with increasing Ti/Al ratio. Hardness showed higher value when Cr contents was $18 wt\%$ less than $21wt\%Cr$. In $3.15 wt\%$Co alloy, $\gamma'$ phase was very fine as around 50nm and, its volume fraction and hardness showed the highest value by 2step-aging treatment.

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References

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