龚志华,杨钢,马龙腾,定巍

• 1:钢铁研究总院
• 2:内蒙古科技大学材料与冶金学院

摘要(Abstract)：

利用微观组织分析及化学相分析的方法研究了9种不同Mo、W含量的汽轮机叶片用GY200镍基合金中碳化物及γ'强化相的析出规律。结果表明,合金中出现MC、M_6C、M_(23)C_6型碳化物,MC相由一次未溶TiC和少量二次析出的TiC组成,MC相含量随W、Mo添加量增加而增加。M_6C在1080℃就开始析出,对于GY200镍基合金,M_6C析出条件可由Cr/(Cr+Mo+0.7W)≤0.847(at%)经验公式来表达。Mo添加后,M_(23)C_6含量随W添加量的增加有减少趋势。Mo促进TCP相析出的动力学比W元素的要强,利用W来替代部分Mo,能够减少Laves相、TCP相的析出。W添加4%以内将明显改善合金高温强塑性。

关键词(KeyWords)： GY200;镍基合金;M23C6;M6C;动力学

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFB0300203)

作者(Author): 龚志华,杨钢,马龙腾,定巍

DOI: 10.13289/j.issn.1009-6264.2017-0178

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