应用液态金属冷却(LMC)和高速凝固(HRS)定向凝固技术,对DZ125高温合金叶片状铸件在不同抽拉速率下的组织演变规律进行了研究,并对比研究了LMC和HRS法所得铸件的微观组织.结果表明,同一定向凝固方法下,随抽拉速率的提高,铸件枝晶组织及γ′析出相得到细化；应用LMC技术所制备铸件的枝晶组织和γ′析出相较相同抽拉速率HRS方法时更为细小；相同工艺参数下LMC和HRS方法所制备铸件一次枝晶间距的差异随铸件壁厚及抽拉速率的增大而更显著.通过对固/液界面前沿温度梯度进行估算发现,LMC方法可获得更高的温度梯度,且其温度梯度受抽拉速率变化影响较HRS更小.除70 μm/s抽拉速率外,LMC法所得γ+γ′共晶组织的含量均显著少于HRS方法；70 μm/s抽拉速率时,LMC法产生的偏析较严重,而其余凝固条件下偏析程度较相同工艺参数下HRS轻.110 μm/s抽拉速率时,HRS方法较LMC方法制备铸件中MC型碳化物尺寸更大.
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