【摘要】 通过真空感应熔炼（VIM）棒料+电极感应熔炼氩气雾化（EIGA）制粉+热等静压（HIP）成形工艺高通量制备5种Zr含量的新型镍基粉末高温合金FGH4107，应用金属材料相图及材料性能模拟软件JMatPro 6.5并结合差示扫描量热分析（DSC）和X射线衍射（XRD），系统研究了Zr含量变化（质量分数0～0.50%）对合金主要平衡相热力学行为、动力学行为以及γ/γ′错配度的影响规律。结果表明：在600～1 400℃范围内，Zr含量由0逐渐增加至0.50%时对合金平衡相种类影响不大，均主要由L、γ、MC、MB₂、γ′、M₃B₂、M₂₃C₆、μ和σ相组成，Zr原子依次进入γ、γ′、MC和Ni₇Zr₂相。随着Zr含量增加，合金初熔温度大幅降低而终熔温度仅略微下降，固液两相区温度范围扩大，γ′相完全溶解温度变化不大。添加Zr引起合金γ′相晶格常数加大而γ基体不变，使得合金γ′/γ错配度从0.215%提高到0.265%，表明Zr进入γ′相可增强析出强化效果。更多还原

【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,μandσphases,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.更多还原