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| Effects of Zr on the equilibrium phases and γ′/γ lattice misfit degree of
nickel-based PM superalloy FGH4107 |
| JIA Jian1,2，ZHANG Yiwen1,2，LI Xinyu1,2，ZHANG Haopeng1,2，HOU Qiong1,2，YAN Ting1,2 |
| （1. High Temperature Material Research Institute，Central Iron and Steel Research Institute，Beijing 100081，
China; 2. Gaona Aero Material Co. Ltd.，Beijing 100081，China） |
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Abstract Nickel-based powder metallurgy（PM）superalloy FGH4107 with five varied Zr contents were prepared
by the high-throughput preparation, including vacuum induction melting（VIM）, electrode induction-melting gas
atomization（EIGA）, and hot isostatic pressing（as-HIPed）processes. The effects of Zr content（mass fraction 0~
0.50%）on the equilibrium phases thermodynamics, kinetic behavior and γ/γ′ lattice misfit degree were studied by
the calculation and simulation of JMatPro 6.5 software, combined with differential scanning calorimetry（DSC）
and X-ray diffraction（XRD）. The results show that in the range of 600-1 400 ℃, the Zr content has little effect on
the types of equilibrium phases, which are mainly composed of L, γ, MC, MB2, γ′, M3B2, M23C6, μ and σ phases, Zr
atoms enter γ, γ′, MC and Ni7Zr2 phase in turn. With the increasing of Zr content from 0 to 0.50%, the initial melting
temperature is greatly reduced but the final melting temperature is slightly decreased, and the temperature range of
the solid-liquid two-phase region is enlarged. However, the Zr content has little effect on the solvus temperature of
the γ′ phase. With the addition of Zr from 0 to 0.50%, γ′/γ lattice misfit degree increases from 0.215% to 0.265%,
indicating that Zr enters γ′ phase and enhances the precipitation strengthening effect.
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Received: 18 August 2022
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2023, Vol. 33 
