Estimation of the effect of hafnium on equilibrium phases in FGH97 PM superalloy

ZHANG Yi-wen; WANG Fu-ming; HU Ben-fu

doi:10.13374/j.issn1001-053x.2011.08.013

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ZHANG Yi-wen, WANG Fu-ming, HU Ben-fu. Estimation of the effect of hafnium on equilibrium phases in FGH97 PM superalloy[J]. Chinese Journal of Engineering, 2011, 33(8): 978-985. doi: 10.13374/j.issn1001-053x.2011.08.013

Citation:

ZHANG Yi-wen, WANG Fu-ming, HU Ben-fu. Estimation of the effect of hafnium on equilibrium phases in FGH97 PM superalloy[J]. Chinese Journal of Engineering, 2011, 33(8): 978-985. doi: 10.13374/j.issn1001-053x.2011.08.013

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Estimation of the effect of hafnium on equilibrium phases in FGH97 PM superalloy

doi: 10.13374/j.issn1001-053x.2011.08.013

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. High Temperature Material Institute, Central Iron and Steel Research Institute, Beijing 100081, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2010-07-29
Available Online: 2021-07-30

Abstract

Abstract

The stable phases and composition of FGH97 powder metallurgy(P/M) superalloy with different contents of hafnium were calculated by JMatPro software.The effects of hafnium content on the equilibrium phases and composition were studied.Meanwhile,the stable phases were analyzed and checked by physical and chemical phase analyses and microstructure observations.Then,the behaviors of phase precipitation and the character of hafnium partition in different phases were revealed and the effects of hafnium on FGH97 P/M superalloy were summarized.It is shown that the stable phases at 750℃ include γ matrix,γ' phase,MC carbide,M₂₃C₆ carbide,M₃B₂ boride,and μ phase.Hafnium mainly exists in γ' phase and MC carbide,and increasing the hafnium content causes the different distribution of hafnium between γ' phase and MC carbide.
- superalloys,
- hafnium,
- thermodynamic calculations,
- equilibrium phases,
- precipitation