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Acta Metall Sin  2012, Vol. 48 Issue (6): 661-670    DOI: 10.3724/SP.J.1037.2011.00769
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CLASSICAL PRECIPITATION DYNAMIC MODEL OF γ' PHASE OF NICKEL--BASED SUPER ALLOYS AND APPLICATIONS
SHI Yuye1, JIAO Shaoyang1,2, DONG Jianxin1, ZHANG Maicang1
1. School of Materials Science and Engineering, University of Science  and Technology Beijing, Beijing 100083
2. China Nuclear Power Engineering Co. Ltd., Beijing 100840
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SHI Yuye, JIAO Shaoyang, DONG Jianxin, ZHANG Maicang. CLASSICAL PRECIPITATION DYNAMIC MODEL OF γ' PHASE OF NICKEL--BASED SUPER ALLOYS AND APPLICATIONS. Acta Metall Sin, 2012, 48(6): 661-670.

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Abstract  Based on the classical nucleation theory, and considering the effects of heat temperature and preservation time on precipitation, the γ' precipitation model in nickel-based superalloy was established. In combination with the characteristic value data of γ' precipitation which was got by isothermal aging experiment of GH738 alloy, the relative accuracy of simulation result was verified. Results show that the classic dynamic model of the precipitation can better forecast that γ' phase of multiple complex nickel--based alloy system mainly precipitate by uniform nucleation. Further, precipitation model was combined with four typical superalloys GH80A, GH738, U720Li and DD407. The effects of the contents of Al, Ti and its ratio change on the precipitation of γ' were calculated and analyzed. Results showed that the better role of Al than Ti on equilibrium content. Under the premise of equal amount of Al + Ti, the increasing of Ti had a greater contribution to the driving force of precipitation and complete precipitation time, and increased the volume fraction of the beginning of precipitation, but reduced the size of precipitated phase.
Key words:  classical nucleation theory      super alloy, precipitate      simulation     
Received:  07 December 2011     
ZTFLH: 

TG132.3

  
Fund: 

National Natural Science Foundation of China
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DAN Yu-Shu
QIAO Shao-Yang
DONG Jian-Xin
ZHANG Mai-Cang

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00769     OR     https://www.ams.org.cn/EN/Y2012/V48/I6/661

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