| 李万礼,曹国鑫,刘向宏,孙文儒.低膨胀高温合金晶粒长大规律及对其性能的影响[J].稀有金属材料与工程,2023,52(4):1499~1506.[LI Wanli,CAO Guoxin,LIU Xianghong,SUN Wenru.Grain growth of low expansion superalloy and its effect on its properties[J].Rare Metal Materials and Engineering,2023,52(4):1499~1506.] |
| 低膨胀高温合金晶粒长大规律及对其性能的影响 |
| 投稿时间：2022-03-20 修订日期：2022-04-07 |
| 中文关键词: Laves相 晶粒长大 回溶 塑性 |
| 基金项目:陕西省重大科技项目(项目号2020zdzx04-04-02) |
| 中文摘要: |
| 本文通过研究不同热处理制度对低膨胀高温合金析出相的行为以及晶粒长大的影响。实验结果表明,在Laves相析出峰温度范围(980℃~990℃)保温不同时间,Laves相尺寸逐渐增大,晶粒不长大。在1000℃~1040℃保温1h后Laves相开始溶解,晶粒逐渐长大至4级、3.5级、3级、2级,因此在热加工过程中为避免晶粒度长大,热变形加热温度不应超过1010℃,或在1000℃变形且保温时间不应超过1h。晶界Laves相的含量对合金性能影响较小,而合金的晶粒度对其影响较大。 |
| Grain growth of low expansion superalloy and its effect on its properties |
| 英文关键词:Laves phase Grain growth Solubilization Plasticity |
| 英文摘要: |
| Effects of different heat treatment regimes on the precipitate behavior and grain growth of low expansion superalloy were studied. The experimental results show that the size of Laves phase increases gradually but the grain size does not grow when under the Laves phase precipitation peak temperature ranges from 980℃ to 990℃. After holding at 1000℃~1040℃ for 1h, Laves phase began to dissolve, and the grain size gradually grew to grade 4, 3.5, 3 and 2. Therefore, in the process of hot working, to avoid the growth of grain size, the thermal deformation temperature should not exceed 1010℃, or the deformation at 1000℃ and holding time should not exceed 1h. Laves phase content at grain boundary has little effect on the properties of the alloy, but the grain size has a great effect on it. |
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