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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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