| 摘要: |
| 7A09铝合金作为一种典型的可变形超高强铝合金被广泛应用于航空航天和汽车制造领域，是新一代运载火箭钣金件主材料之一。通过室温拉伸试验和硬度测试，对2种不同厚度规格的7A09铝合金板材在不同固溶温度和人工时效温度下经过热处理后的硬度、抗拉强度和延伸率进行分析对比，获得了7A09铝合金板材的固溶温度和时效温度范围，确定了不同固溶-时效条件下硬度和抗拉强度的对应关系，并通过生产试验进行了验证，结果表明：获得的硬度和抗拉强度关系曲线较为准确，对于非承力运载火箭钣金件，可通过硬度检测代替抗拉强度检测以确定性能指标是否合格，缩短检测周期，降低制造成本。 |
| 关键词: 铝合金 强度 硬度 固溶处理 时效处理 |
| 基金项目: |
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| Study on the Relationship Between Hardness and Strength of Aerospace Material 7A09 Aluminum Alloy Based on Solution-aging Heat Treatment |
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Bi Haijuan1, Wang Yanqin1, Peng Jiangtao1, Li Jiguang1, Chu Guannan2,3
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1. Tianjin Long March Launch Vehicle Manufacturing Co., Ltd., Tianjin 300462;2. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209;3.Harbin Institute of Technology (Weihai) Innovation Park Co., Ltd., Weihai 264209
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| Abstract: |
| As a typical deformable ultra-high strength aluminum alloy, 7A09 aluminum alloy is widely used in aerospace and automobile manufacturing fields, and is one of the main materials of sheet metal parts for the new generation of launch vehicle. Through tensile test and hardness test at room temperature, the hardness, tensile strength and elongation of two kinds of 7A09 aluminum alloy sheets with different thickness were analyzed and compared after heat treatment at different solution temperatures and artificial aging temperatures. The range of solution temperature and aging temperature of 7A09 aluminum alloy sheets was obtained, and the corresponding relationship between hardness and tensile strength under different solution-aging conditions was determined. The results show that the relationship curve between hardness and tensile strength obtained is more accurate. For non-load-bearing sheet metal parts of launch vehicle, hardness testing can replace tensile strength testing to determine whether the performance indicators are qualified, shorten the testing cycle and reduce manufacturing costs. |
| Key words: Al alloy strength hardness solution treatment aging treatment |
