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| 焊接速度对 7A52 铝合金 FSW 组织及力学性能的影响 |
| Effect of Welding Speed on Microstructure and Mechanical Properties of 7A52 Aluminum Alloy by Friction Stir Welding |
| Received:August 10, 2015 Revised:September 10, 2015 |
| DOI：10.3969/j.issn.1674-6457.2015.05.011 |
| 中文关键词: 7A52 铝合金 搅拌摩擦焊 显微组织 力学性能 |
| 英文关键词: 7A52 aluminum alloy friction stir welding microstructure mechanical property |
| 基金项目: |
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| 中文摘要: |
| 目的 在保证搅拌速度一定时,针对 8 mm 厚的 7A52 铝合金,在不同焊接速度下采用搅拌摩擦焊(FSW)进行焊接试验,研究其焊接接头的显微组织及力学性能。 方法 利用搅拌摩擦焊机进行对接焊接,焊后制取金相试样观察焊接接头宏观形貌和显微组织,并测定其力学性能。 结果 7A52 铝合金 FSW 焊接接头焊核区的面积随着焊接速度的增大而增大,当焊接速度为 250mm/ min 时,焊接接头的焊核区面积最大,焊核区的显微组织都为细小的等轴晶,焊接接头横截面的焊核区呈明显“洋葱环”的形貌,而热力影响区的结构特征则呈现出了较高的塑性变形流线层。焊接接头显微硬度分布都呈现出“W”形变化,在焊接速度为 150 mm/ min 时,焊接接头的平均抗拉强度能达到 452 MPa,达到了母材抗拉强度的 89% 。 结论 通过对不同焊接速度下 7A52 铝合金FSW 焊接接头的组织和性能进行研究,得到了不同焊接速度下焊接接头组织和力学性能。 |
| 英文摘要: |
| When the stirring speed was constant, the welding test for 7A52 alloy aluminum with a thickness of 8 mm was conducted using friction stir welding (FSW) at different welding speeds. The microstructure and mechanical properties of welded joints were studied. The friction stir welding machine was used for butt welding, the metallographic specimen was made after welding to observe macro and microstructure of the welding joint, and its mechanical properties were also measured. The area of 7A52 aluminum FSW welding joints in the welded zone increased as the welding speed increased, when the welding speed was 250 mm/ min, the welding joint area was the biggest. The microstructure of welded zone was fine equiaxed crystal, the welded zone on the cross section of the welding joint showed obvious morphology of onion rings, and the structural features of the heat affected zone showed relatively high plastic deformation streamline. The distribution of the hardness of welded joints showed a " W" shape change. When the welding speed was 150 mm/ min, the average tensile strength of welded joints was 452 MPa, reaching 89% of the tensile strength of the base material. In conclusion, the effects of different welding speeds of 7A52 aluminum alloy on the microstructure and the property of the friction stir-welding joint were studied. The microstructure and properties of welded joints at different welding speeds were obtained. |
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