| 双级时效对7050-T7451铝合金搅拌摩擦焊组织及应力腐蚀敏感性的影响 |
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| 引用本文： | 张华,郭启龙,赵常宇,林三宝,石功奇.双级时效对7050-T7451铝合金搅拌摩擦焊组织及应力腐蚀敏感性的影响[J].焊接学报,2020,41(6):1-5. |
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| 作者姓名： | 张华 郭启龙 赵常宇 林三宝 石功奇 |
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| 作者单位： | 1.北京石油化工学院，北京，102617 |
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| 基金项目： | 北京市长城学者培养计划;国家自然科学基金 |
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| 摘 要： | 采用搅拌摩擦焊方法对3 mm厚7050-T7451铝合金进行焊接，为改善接头应力腐蚀敏感性，焊后进行121 ℃ × 5 h + 163 ℃ × 27 h双级时效处理. 通过对微观组织、显微硬度以及应力腐蚀敏感性的分析，研究双级时效对焊接接头性能的影响. 结果表明，双级时效后晶粒发生粗化，晶界内析出相和周边无沉淀析出带(PFZ)变宽，导致在热影响区和热力影响区出现大量不连续晶界；接头热影响区的显微硬度有所下降，但范围明显变窄，接头组织的均一性得到改善；时效处理后的接头在进行应力腐蚀试验 60天后仍未发生断裂，而未经时效处理的接头在1天内全部发生断裂，说明双级时效有效降低了焊接接头的应力腐蚀敏感性.
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| 关 键 词： | 7050铝合金 搅拌摩擦焊 双级时效 应力腐蚀敏感性 |
| 收稿时间： | 2019-05-13 |
Influence of two-step aging on structure and stress corrosion sensitivity of friction stir welded 7050-T7451 aluminum alloys |
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| Affiliation: | 1.Beijing Institute of Petrochemical Technology, Beijing, 102617, China2.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China3.The Welding Institute, Cambridge, CB21 6AL, UK |
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| Abstract: | 3 mm thick 7050-T7451aluminum alloy joint was obtained by friction stir welding, and the two-stage aging treatment was performed at 121 ℃ × 5 h + 163 ℃ × 27 h after welding. Microstructure, hardness profiles and stress corrosion sensitivity of the joint were measured and studied. The results indicate that through the two-step aging, the grain size is coarsened, the age-hardening precipitates and PFZ become wider at the same time, which results in the discontinuous grain boundary; the microhardness of the FSW joints decreased, but the heat-affected zone significantly narrowed, which increased the uniformity of the microhardness of the FSW joints; and the two-stage aging effectively reduced the stress corrosion sensitivity of the FSW joints. The joints with aging treatment were not broken after 60 days, however all the joints without aging treatment were broken within 1 day. |
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