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| Precipitation of �� Phase in Nickel-based Powder Metallurgy Superalloy FGH97 |
| Li-ming TAN1,2,Yi-wen ZHANG1,2,Jian JIA1,2,Shou-bo HAN1,2 |
1. High Temperature Material Institute, Central Iron and Steel Research Institute, Beijing 100081, China
2. Beijing Key Laboratory of Advanced High Temperature Materials, Beijing 100081, China |
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Abstract The precipitation behavior of topological close-packed (TCP) �� phase in powder metallurgy (P/M) nickel-based superalloy FGH97 was investigated. The results showed that proper addition of solution strengthening elements, such as Co, Cr, W, Mo, improved tensile strength, while excessive addition of those elements facilitated the precipitation of �� phase, which seriously aggravated the plasticity of the P/M superalloy. For the heat-treated specimens, the relationship between critical aging time (when �� started to precipitate), aging temperature, and the average electron vacancy number of �� matrix was established.
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Received: 24 August 2015
Published: 09 August 2016
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| Fund:International Science & technology Cooperation Program of China |
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Corresponding Authors:
Yiwen Zhang
E-mail: yiwen64@cisri.com.cn
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2016, Vol. 23 
