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| 镍基合金完全再结晶后的晶粒长大行为研究 |
| Grain Growth Behavior after Full Recrystallization in a Nickel-based Superalloy |
| Received:August 31, 2020 |
| DOI：10.3969/j.issn.1674-6457.2021.01.009 |
| 中文关键词: 晶粒长大 完全再结晶 镍基合金 |
| 英文关键词: grain growth full recrystallization nickel-based superalloy |
| 基金项目:国家自然科学基金(51905048) |
| Author Name | Affiliation | | CHEN Xiao-min | College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China | | LIN Yong-cheng | School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China | | HU Hong-wei | College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China | | CHEN Ming-song | School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China |
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| 中文摘要: |
| 目的 研究镍基合金完全再结晶后的晶粒长大行为。方法 首先通过两道次热压缩实验获得镍合金完全再结晶组织，然后对完全再结晶的组织进行退火热处理使晶粒长大。采用电子背散射衍射实验研究发生长大的晶粒组织形貌与尺寸变化规律。结果 完全再结晶后的退火工艺参数对平均晶粒尺寸有显著影响。完全再结晶后的晶粒能够在较高的退火温度和较长的退火时间下快速长大。基于实验结果，建立了能够准确描述镍基合金完全再结晶后晶粒长大行为的动力学模型。结论 为了有效抑制完全再结晶后的晶粒长大行为，退火温度不宜升高，退火时间不宜过长。晶粒尺寸的调控工艺参数可以参考所建立的晶粒长大模型来选择。 |
| 英文摘要: |
| The work aims to study the grain growth behavior of a nickel-based superalloy after full recrystallization. The full recrystallization microstructure was obtained by two-pass hot compression tests. Then the nickel-based superalloy was annealed to contribute grain growth. The electron backscattered diffraction technology (EBSD) was utilized to analyze the microstructure and dimensional change of grain growth. It was found that the annealing parameters greatly affected the average grain size. The fully-recrystallized grains can rapidly grow up at relatively high annealing temperature and long annealing time. Based on the experimental results, a kinetics model which can accurately describe the grain growth of nickel-based superalloy after full recrystallization was established. To effectively inhibit the grain growth after full recrystallization, the annealing temperature should not be too high and the annealing time should not be too long. The process parameters of grain size control can be selected by referring the established grain growth model. |
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