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对新型镍基粉末高温合金(FGH98Ⅰ)在不同温度下进行固溶热处理,采用热力学相计算、光学显微镜、场发射扫描电镜及化学相分析等研究了亚固溶和过固溶合金的析出相和显微组织,并综合分析了组织与性能的关系。结果表明:FGH98Ⅰ合金经1130℃亚固溶和1190℃过固溶处理后的析出相均为γ’、MC、M23C6和M3B2等,未发现TCP(拓扑密堆)相。FGH98Ⅰ合金亚固溶热处理后晶粒稍有长大,存在尺寸不同的初次、二次和三次γ′相;过固溶热处理合金的晶粒明显长大,存在单模分布的二次γ′相;前者由于晶粒较小使强度更高,后者因减小二次γ′相尺寸和消除初次γ′相,PPB(原始颗粒边界)和残余枝晶,提高了合金的高温塑性和持久性能,说明不同晶粒尺寸和γ′相特征是FGH98Ⅰ盘件获得双性能的关键因素。
The heat treatment of the new nickel-base powder superalloy FGH98Ⅰ was carried out at different temperatures. The precipitation phase of sub-solution and over-solid-solution alloy was studied by thermodynamic phase calculation, optical microscope, field emission scanning electron microscope and chemical phase analysis. Microstructure, and a comprehensive analysis of the relationship between the organization and performance. The results show that the precipitated phases of FGH98Ⅰ alloy are γ ’, MC, M23C6 and M3B2 after 1130 ℃ subsolidification and 1190 ℃ solution treatment, respectively. No TCP (topological close-packed) phase was found. After the subsolid solution heat treatment, the grains grow slightly and the primary, secondary and tertiary γ ’phases with different sizes exist. The grains of the solution treated alloy have obviously grown, and there exists the single-mode secondary γ’ phase ; The former due to the smaller grain size to make the strength higher, the latter due to reduce the secondary γ ’phase size and eliminate the initial γ’ phase, PPB (primary particle boundary) and residual dendrite, improve the high temperature ductility and long-lasting alloy , Indicating that different grain sizes and γ ’phase characteristics are the key factors for obtaining dual performance of FGH98Ⅰ plate.