对应用液态金属冷却(LMC)和高速凝固(HRS)方法制备的叶片状高温合金铸件的铸态组织进行了研究,以比较2种定向凝固方法的优缺点.分别对沿铸件凝固方向不同截面位置处的晶粒取向、一次枝晶间距和γ’相尺寸进行了分析.结果表明,对于HRS铸件的中部截面,枝晶的<001>方向偏离铸件轴向的最大角度在抽拉速率由40 μm/s提高至110 μm/s的过程中不断减小.在70 μm/s的抽拉速度下,LMC铸件中部截面处的中心区域内晶粒的最大偏离角度要大于HRS铸件的相应位置处的偏离角,但是晶粒的整体取向却呈现较HRS铸件更集中的趋势.铸件项部截面处的枝晶组织比中部截面处要粗大,这种现象在HRS铸件中更严重.γ’相尺寸在铸件由叶身位置凝固至平台位置的过程中不断粗化.但当抽拉速率高于70 μm/s时,叶身位置和平台位置之间γ’相尺寸之间的差异在LMC铸件中更小.
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