| GH4096合金在长期热暴露过程中的组织演化 |
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| 引用本文： | 白云瑞,胡钰昊,钟燕,郭会明,李福林,付锐.GH4096合金在长期热暴露过程中的组织演化[J].金属热处理,2020,45(6):108-113. |
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| 作者姓名： | 白云瑞 胡钰昊 钟燕 郭会明 李福林 付锐 |
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| 作者单位： | 1. 中国航发四川燃气涡轮研究院, 四川 成都 610500;2. 钢铁研究总院 高温材料研究所, 北京 100081 |
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| 摘 要： | 基于粉末冶金René88DT合金的成分,采用新型定向凝固铸锭变形工艺研制了GH4096合金,并研究了其固溶时效热处理后在700~900 ℃长期热暴露过程中γ′相的粗化和晶界析出相的析出行为。结果表明:GH4096合金在700 ℃热暴露时具有良好的组织稳定性,晶内γ′相的尺寸稳定在70 nm左右,未发现明显的长大行为,晶界上未发现析出相;750 ℃热暴露500 h以上时,二次γ′相开始出现聚集长大现象,晶界开始出现不连续析出相,但γ′相的长大速度和晶界析出相的析出速度均比较低;800 ℃以上长期热暴露时,γ′相的粗化速度和晶界析出相的析出长大速度明显加快。长期热暴露后晶内二次γ′相的尺寸与Larsen-Miller参数近似呈线性关系,晶界析出相以M3B2和μ相为主。
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| 关 键 词： | GH4096合金 热暴露 组织演化 |
| 收稿时间： | 2019-12-21 |
Microstructure evolution of GH4096 alloy during long-term thermal exposure |
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| Bai Yunrui,Hu Yuhao,Zhong Yan,Guo Huiming,Li Fulin,Fu Rui.Microstructure evolution of GH4096 alloy during long-term thermal exposure[J].Heat Treatment of Metals,2020,45(6):108-113. |
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| Authors: | Bai Yunrui Hu Yuhao Zhong Yan Guo Huiming Li Fulin Fu Rui |
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| Affiliation: | 1. AECC GAS Turbine Establishment, Chengdu Sichuan 610500, China;2. High Temperature Material Research Institute, Central Iron & Steel Research Institute, Beijing 100081, China |
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| Abstract: | Based on the composition of powder metallurgy René88DT alloy, GH4096 alloy was prepared by using a new deformation process. The coarsening of the γ′ phase and the precipitation behavior of the grain boundary precipitated phase in the solution treated and aged GH4096 alloy during long-term thermal exposure between 700-900 ℃ were studied. The results show that the GH4096 alloy has good microstructure stability during thermal exposure at 700 ℃. The size of the intragranular γ′ particles is stable at about 70 nm, and no precipitated phase is observed at the grain boundaries. The secondary γ′ phases begin to grow by a coalescence process, and the discontinuous phases begin to precipitate on the grain boundaries after exposure at 750 ℃ for 500 h, however, the growth rate of γ′ phase and the precipitation rate of grain boundary precipitates are relatively low. When the exposure temperature is above 800 ℃, The coarsening rate of γ′ phase and the precipitation and growth rate of grain boundary precipitates are obviously accelerated. After long-term thermal exposure, the relationship between the size of the secondary γ′ phase and Larsen Miller parameter is approximately linear, and the main precipitates are M3B2 and μ phase. |
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| Keywords: | GH4096 alloy thermal exposure microstructure evolution |
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