秦升学,赵蕊蕊,张弘斌,刘杰,娄淑梅

• 1:山东科技大学机械电子工程学院

摘要(Abstract)：

采用透射电镜(TEM)和扫描电镜(SEM)分析了不同时效热处理制度下镍基GH99高温合金中γ'相的尺寸、形貌变化,采用维氏硬度计测试不同时效热处理制度下的合金硬度。结果表明:γ'相随着时效温度的升高和保温时间的延长而明显粗化,其粗化符合沉淀相粗化理论(LSW理论);随着γ'相的不断长大,部分γ'相的形貌由球形转变为立方形。经计算得到γ'相长大激活能约为248.8 k J/mol。此外发现硬度随γ'相尺寸的增大而逐渐增大,但当γ'相尺寸超过37.2 nm时,硬度随γ'相长大呈下降趋势,在750℃时得到合金的最大硬度为395.16 HV。

关键词(KeyWords)： 时效热处理;GH99高温合金;γ'相;长大方程;硬度

Abstract:

Keywords:

基金项目(Foundation): 山东省自然科学基金(ZR2014JL040);; 山东科技大学人才引进科研启动基金(2016RCJJ019,2014RCJJ021)

作者(Author): 秦升学,赵蕊蕊,张弘斌,刘杰,娄淑梅

DOI: 10.13289/j.issn.1009-6264.2017.02.009

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