【摘要】 对比研究了FGH95合金在不同热加工工艺和热处理制度下合金的组织及γ′的分布,用光学显微镜、扫描电镜(SEM)和透射电镜(TEM)观察了不同热处理制度处理后合金的组织及时效后γ′的中心暗场相,测试了室温(20℃)和高温(650℃)材料的拉伸性能,并对高温瞬时断裂区断口进行了对比分析.结果表明:相同热处理工艺,HIP温度越高,时效析出的γ′相尺寸越大;不同热处理制度均能够改变γ′的分布;盐浴冷却明显增大中等尺寸γ′相数量,显著提高合金高温塑性.更多还原

【Abstract】 The microstructure and γ′ phase distribution of FGH95 P/M superalloy under different hot extrusions and heat treatments were investigated. OM, SEM and TEM were employed to study the microstructure after heat treatment and γ′ phase’s dark field images after aging treatment. Tensile properties at room temperature (20?℃) and high temperature (650?℃) were tested. The microstructure of instant fracture appearance at high temperature was also analyzed. The results show that under the same heat treatment the higher HIP temperature is, the larger γ′ phase size during aging treatment is. Heat treatment processing can change the distribution of γ′ phase, and salt cooling can increase the total number of γ′ phase with middle size and markedly improve the high-temperature plasticity.更多还原