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| 镍基高温合金初始织构对电辅助拉伸宏微观行为的影响 |
| Effects of Initial Texture on Macro-micro Behaviors of Ni-based Superalloy during the Electrically-assisted Tensile |
| Received:August 05, 2019 Revised:September 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.05.004 |
| 中文关键词: 电辅助成形 镍基高温合金 织构 变形抗力 |
| 英文关键词: electrically-assisted forming Ni-based superalloy texture flow stress |
| 基金项目:国家自然科学基金（U1737212，U1637102） |
| Author Name | Affiliation | | ZHANG Xin | 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, China | | LI Zhi-jun | 3. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China | | LI Hong-wei | 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, China | | ZHAN Mei | 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, China | | SHAO Guang-da | 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, China | | GAO Jia | 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 目的 研究织构对镍基高温合金电辅助成形的影响规律。方法 通过准静态拉伸与电辅助拉伸对比实验，研究了不同初始织构对镍基高温合金电辅助成形宏观力学行为以及微观组织演化的影响规律。结果 当初始织构为易变形织构时，拉伸后的纤维织构峰值较低，而电辅助拉伸过程中焦耳热使得试样温度升高，变形抗力得到下降，在一定程度上增大了纤维织构的强度。当初始织构为难变形织构时，材料变形抗力大，拉伸后纤维织构峰值较高，但材料变形过程晶粒细化程度高，缺陷的增多导致电辅助成形过程中焦耳热更为明显，焦耳热导致的高温使得难变形晶粒变形更为协调，最终的纤维织构强度有所下降。结论 不同的初始织构对电辅助成形宏微观行为有较大的影响，因此合理利用织构在电辅助成形过程中的影响以完善电辅助成形工艺十分重要。 |
| 英文摘要: |
| The paper aims to study the effect rule of texture on electrically-assisted forming of Ni-based superalloy. Quasi-static tension and electrically-assisted tension were compared in experiment to study the effect of initial texture on macro mechanical behaviors and microstructure evolution of electrically-assisted forming of Ni-based superalloy. It was found that the fiber texture intensity was lower when the initial texture was easy-to-form texture after quasi-static tension. However, the flow stress of the sample was reduced because of the increasing Joule heat during the electrically-assisted tension, which increased the strength of fiber texture intensity. When the initial texture was difficult-to-form texture, the flow stress was higher and the fiber texture intensity after quasi-static tension was larger. However, the grain refinement degree was also higher under this condition. As a result, the increase of defects led to more obvious Joule heating effects during the electrically-assisted process. The extremely high temperature resulted in more harmonious deformation of difficult-to-form grains; therefore, the intensity of final fiber texture was weakened. Different initial textures have significant influences on the macroscopic/microscopic behaviors of electrically-assisted forming. Therefore, it is very important to make reasonable use of the influences of texture in electro-assisted forming so as to improve the process of elec-tro-assisted forming. |
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