高温合金粉末的预热处理
(1. 北京科技大学 材料科学与工程学院，北京 100083;
2. 宁夏大学 物理与电气信息工程学院， 银川 750021)
摘 要: 在不同热处理制度下对等离子旋转电极雾化（PREP）FGH95高温合金粉末颗粒进行预热处理, 并对热处理粉末颗粒微观组织、 碳化物析出相及γ′相的变化规律进行研究。结果表明： 随着预热处理温度升高, 树枝晶组织逐渐消失, γ′相由圆形逐渐转变为方形, 粉末颗粒中的MC′型亚稳碳化物发生分解和转变, 析出稳定的MC， M23C6及M6C型碳化物。 M23C6碳化物的析出温度为950℃， M23C6与M6C碳化物的相互转变温度为1000-1050℃， M23C6和M6C的溶解温度为1100℃。
关键字: 等离子旋转电极雾化; FGH95高温合金粉末; 预热处理; 微观组织; 析出相
（1. School of Materials Science and Engineering,
University of Science & Technology Beijing,
Beijing 100083, China;
2. School of Physics and Electrical Information Engineering,
Ningxia University, Yinchuan 750021, China）
Abstract:In order to investigate the relation between the microstructure of superalloy powders and the heat treatments, the microstructures and the transformations of precipitates in FGH95 superalloy powders prepared through plasma rotating electrode processing (PREP) under different pre-heat treatment temperatures were studied. The results show that with increasing the pre-heat treatment temperature, the dendritic microstructure disappears gradually and the morphology of γ′phase changes into rectangular from circular. The MC′ type non-equilibrium carbide can be transformed into stable carbides such as MC, M23C6 and M6C type carbides during pre-heat treatment. It is also shown that the precipitating temperature and the dissolution temperature of M23C6 and M6C type carbides are near 950℃ and 1100℃ respectively. And the transformation temperature between M23C6 and M6C type carbide is in the range from 1000℃ to 1050℃.
Key words: PREP; FGH95 superalloy powder; pre-heat treatment; microstructure; precip
