采用扫描电镜、透射电镜等手段研究了预处理前后FGH96合金粉末颗粒中的碳化物演变。结果表明：粉末在快速凝固过程中会析出不同形貌的MC＇型亚稳态碳化物,MC＇碳化物中含有较多的弱碳化物形成元素,不同形貌的MC＇型碳化物的化学组成与点阵常数具有一定的差异。在粉末预处理过程中,粉末颗粒内部形成的亚稳态MC＇型碳化物逐渐转变为稳定MC型碳化物,同时可形成M23C6和M6C碳化物;转变后的MC型碳化物形态以规则块状为主,成分上以强碳化物形成元素Ti,Nb,Zr为主。
Carbides evolution of FGH96 PM superalloy powders during pre-heat treatment were studied by means of SEM and TEM.The results show that MC′ metastable carbides are precipitated during rapid solidification,and the MC′ carbides contain more weak carbide forming elements and show different morphology,composition and lattice parameters.During pre-heat treatment,MC′ metastable carbides transform to stable MC carbide,M23C6 and M6C carbides.After pre-heat treatment,stable MC carbides are mainly regular block-shape containing strong carbide forming elements of Ti,Nb and Zr.
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