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    • 浇注温度对DD419单晶高温合金组织及持久性能的影响

    张辉, 丁强,刘纪德

    doaj（2025）

    Cited 0|Views7
    Abstract
    研究不同浇注温度的DD419单晶高温合金在 850℃/650 MPa、1050℃/190 MPa、1100℃/130 MPa下的持久性能,并采用SEM、EDS和TEM分析不同浇注温度下的组织形态和成分偏析,研究其对持久性能的影响.结果表明:浇注温度降低,合金一次枝晶间距增大,共晶含量和显微孔洞增多,同时γ′相尺寸减小.在高温低应力(1100℃/130 MPa)下持久性能受γ′相尺寸的影响大于显微孔洞和残余共晶含量,细小弥散的γ′相有利于合金的持久性能,因此 1500℃浇注的合金持久性能最佳.中温高应力下γ′相被大量位错切割,弥散的γ′相更利于位错塞积.同时不同浇注温度下的合金均保持了良好的伸长率,但随着浇注温度的降低,3种测试条件下的断面收缩率下降.浇注温度对合金的断口形貌影响不大,850℃/650 MPa持久断口附近的γ′相依旧保持立方形态,断裂机制为混合断裂,其他条件下γ′相均发生了筏化,断裂机制均为微孔聚集型断裂.
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    Key words
    DD419,pouring temperature,creep rupture property,micropore,fracture mechanism
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