研究了Al含量对HK40合金微观组织的影响,采用OLYMPUS金相显微镜观察金相组织,并利用FEIQuanta200型扫描电镜观察背散射电子衍射图像,结合XD-3A型X射线衍射仪对合金进行物相分析。结果表明,在含2wt%Al的HK40合金中,Al元素全部固溶于基体中,未形成沉淀相,显微组织为奥氏体+碳化物;当Al含量为4wt%时,合金中出现了大量的树枝相AlNi、Fe2Al5,基体相仍然为γ-Fe固溶体;当Al含量增加到6wt%时,基体相转变成以α-Fe为主,同时有大量AlNi金属间化合物析出。 The effect of Al content on the microstructure of HK40 alloy was investigated. The microstructure of HK40 alloy was observed by OLYMPUS microscope. The backscattered electron diffraction (XRD) images were observed by FEIQuanta200 scanning electron microscope. The phase analysis . The results show that in the HK40 alloy containing 2wt% Al, Al element is all solid solution in the matrix, the precipitate phase is not formed and the microstructure is austenite + carbide. When Al content is 4wt%, Al A large amount of AlNi, Fe2Al5, the matrix phase is still γ-Fe solid solution; When the Al content increased to 6wt%, the matrix phase transformation to α-Fe-based, while a large number of AlNi intermetallic compounds precipitation.