研究了ЖC6y合金服役过程中的组织演化规律与恢复热处理后组织形貌的变化.结果表明:经过高温长时服役后合金主要强化相的γ'粒子出现显著退化,γ'粒子的粗化存在Ostwald熟化机制与粒子聚集机制,它的粗化行为可以通过γ'相的形貌特征参数进行表征.MC碳化物在服役中发生分解,转变为周围包覆一层γ'膜的M6C型碳化物.在一定条件下,基体中可直接析出M6C型碳化物.晶界处碳化物有更强烈的分解趋势,晶界处形成包覆一层γ'膜的不连续M6C型碳化物.此种恢复热处理工艺优化了γ'粒子的形貌、尺寸、分布,有效恢复合金的组织退化及显微硬度,形成锯齿晶界,使合金持久性能得到恢复,提高了合金使用寿命.
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