FGH96合金粉末的俄歇分析及预热处理

来源期刊:中国有色金属学报2012年第10期

论文作者:张义文 刘建涛

文章页码:2797 - 2804

关键词:FGH96合金粉末;俄歇分析;预热处理;碳化物

Key words:FGH96 superalloy powder; auger electron spectroscopy; pre-heat treatment; carbide

摘    要:针对等离子旋转电极工艺制备的FGH96合金粉末,采用俄歇电子能谱对合金粉末的颗粒表面进行成分分析,并利用透射电镜对预热处理后粉末中的碳化物演变进行研究。结果表明:FGH96合金粉末的颗粒表面明显存在O、C和Ti元素的偏聚,原始合金粉末的颗粒表面由O和C 原子吸附层和富含Ti元素的碳?氧化物层组成;经过预热处理,颗粒中形成于快速凝固过程中的MC′亚稳碳化物转变成稳定的MC碳化物,并析出M23C6碳化物,明显改善了颗粒内碳化物的稳定性和分布状态。

Abstract: The chemical composition on particle surface of FGH96 superalloy powders was analyzed by means of auger electron spectroscopy (AES), and the carbide evolution after pre-heat treatment was also analyzed by TEM. The results show that elements O, C and Ti segregate on the particle surface, which is composed of absorption layer and oxy-carbides layer. The absorption layer is mainly composed of O and C atoms, while the oxy-carbides layer is characterized as Ti oxide and carbide. MC′ metastable carbide precipitates during the quick solidification, after the pre-heat treatment, the metastable carbide MC′ changes to stable MC carbide and M23C6 precipitates. This improves the stability and distribution state of carbide in the particles.

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