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| 7050铝合金锻件固溶处理工艺优化研究 |
| Optimization of Solution Treatment Process for 7050 Aluminum Alloy Forgings |
| Received:April 15, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.06.015 |
| 中文关键词: 7050铝合金 固溶处理 时效处理 拉伸性能 |
| 英文关键词: 7050 alloy solution treatment aging treatment tensile property |
| 基金项目:重庆市技术创新与应用发展专项重点项目(CSTC2019jscx-mbdxX0025) |
| Author Name | Affiliation | | JIANG Zhong-tao | Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China | | WANG Xin | School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China | | ZHOU Zhi-ming | School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China | | LIN Hai-tao | Southwest Aluminum Group Co., Ltd., Chongqing 401326, China | | YANG Xu-sheng | Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China | | DAI Fang-fang | Southwest Aluminum Group Co., Ltd., Chongqing 401326, China |
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| 中文摘要: |
| 目的 研究不同固溶温度和固溶保温时间对航空某锻件7050铝合金组织和性能演变规律的影响，优化7050铝合金锻件的固溶热处理工艺参数。方法 通过采用金相组织观察、SEM分析、EBSD测试、导电率测试、室温拉伸性能测试等方法，对比研究合金组织变化如何影响力学性能。结果 随着固溶温度的升高(474~483 ℃)，合金再结晶分数逐渐升高，峰值时效处理后，合金抗拉强度先升高后降低;固溶保温时间(2~5 h)对合金组织与拉伸性能的影响不明显;最优热处理工艺为477 ℃×4 h固溶处理，而后进行121 ℃× 6 h+177 ℃×5 h双级时效。热处理后的力学性能:屈服强度为510 MPa，抗拉强度为558 MPa，伸长率为13.6%，电导率为22.7 MS/m。结论 与固溶时间相比，固溶温度对7050铝合金组织和拉伸性能的影响较大，对合理选择航空用7050铝合金锻件的热处理工艺具有指导意义。 |
| 英文摘要: |
| The work aims to study the effects of different solution temperature and holding time on the microstructure and properties of aviation forgings of 7050 aluminum alloy and optimize the solution heat treatment process parameters of 7050 aluminum alloy. Metallographic observation, SEM analysis, EBSD test, conductivity test, room temperature tensile property test and other methods were used to compare and study the effect of microstructure change on mechanical properties. With the increase of solution temperature (474-483 ℃), the recrystallization fraction of alloy increased gradually. After peak aging treatment, the tensile strength of the alloy firstly increased and then decreased. The solution holding time had no obvious effect on the microstructure and tensile properties of the alloy. The optimal solution treatment process was 477 ℃×4 h and double-stage aging at 121 ℃×6 h+177 ℃×5 h. The mechanical properties after heat treatment were as follows:yield strength of 510 MPa, tensile strength of 558 MPa, elongation of 13.6% and electrical conductivity of 22.7 MS/m. Compared with the solution time, the solution temperature has a greater effect on the microstructure and tensile properties of 7050 aluminum alloy, which is significant to guide the industry to choose the heat treatment process of 7050 aluminum alloy forgings for aviation. |
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