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采用场发射电镜观察不同温度和时间时效后FGH97合金的显微组织,总结3种不同尺寸γ’相的演化规律。结果表明:不同温度下,随时效时间增加,一次γ’相和二次γ’相平均尺寸均存在最大值,三次γ’相平均尺寸均呈线性增长。550℃时效后二次γ’相分裂明显,由立方形长大为不规则形,分裂成田字花瓣形或蝶形,而后分解为小立方形,沿一定方向排列。而750℃时效后期,二次γ’相出现边界融合现象,且小三次γ’相聚集长大。γ’相尺寸变化导致时效后硬度值的变化。
The microstructures of FGH97 alloy after different aging temperatures and aging times were observed by field emission electron microscope. The evolution of γ ’phase of three different sizes was summarized. The results showed that the average size of γ ’phase and secondary γ’ had the maximum at different temperatures with the increase of aging time. The average size of γ ’phase increased linearly. After aging at 550 ℃, the secondary γ ’phase split obviously. The cube shape grows into an irregular shape and splits into petals or butterflies, then breaks down into small cubes and arranges in a certain direction. At 750 ℃, the secondary γ ’phase appears the boundary fusion, and the small third γ’ phase accumulates and grows. γ ’phase size changes lead to changes in the hardness value after aging.