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http://dx.doi.org/10.3740/MRSK.2005.15.12.773

Properties of Nimonic 80A Alloy with Change in the Chemical Compositions and Heat Treatment Paths  

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)
Publication Information
Korean Journal of Materials Research / v.15, no.12, 2005 , pp. 773-779 More about this Journal
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.
Keywords
Nimonic 80A alloy; 2 step-aging treatment; hardness;
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