对新型镍基粉末高温合金(FGH98 Ⅰ)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:FGH98 Ⅰ合金经1130℃亚固溶和1190℃过同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.FGH98 Ⅰ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FGH98 Ⅰ盘件获得双性能的关键因素.
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