Microhardness and Tensile Properties of Friction Stir Welded Joint of 2024 Aluminum Alloy at Different Welding Speeds
摘 要
对5 mm厚2024铝合金板进行了不同焊接速度(20~100 mm·min-1)下的搅拌摩擦焊,研究了焊接接头的显微硬度与拉伸性能。结果表明:接头在垂直于焊缝方向上的显微硬度整体呈W形分布,焊核区显微硬度高于热影响区与热机影响区的,但仍低于母材的,热影响区和热机影响区过渡位置的显微硬度最低;随焊接速度的增大,焊核区的平均显微硬度升高,焊接接头的抗拉强度和伸长率均呈先增大后略微降低的趋势;当焊接速度为80 mm·min-1时,抗拉强度和伸长率均达到最大值,分别为347.2 MPa和7.8%;接头在热机影响区与热影响区边界发生剪切断裂,断裂位置与显微硬度最低位置相吻合,接头的断裂方式为韧性断裂。
Abstract
2024 aluminum alloy plate with thickness of 5 mm was welded by friction stir welding at different welding speeds (20-100 mm·min-1). The microhardness and tensile properties of the welded joints were studied. The results show that the microhardness of the joint in the direction of perpendicular to the weld showed a W-shaped asymmetric distribution. The microhardness of the weld nugget zone was higher than that of the heat affected zone and the heat affected zone, but still lower than that of the base metal; the microhardness of the transition position between the heat affected zone and the thermo-mechanically affected zone was the lowest. With the increase of welding speed, the average microhardness of the weld nugget zone increased; the tensile strength and elongation of the welded joint increased first and then slightly decreased. When the welding speed was 80 mm· min-1, the tensile strength and elongation both reached the maximum values of 347.2 MPa and 7.8%, respectively. The shear fracture of the joint occurred at the transition position between the heat affected zone and the thermo-mechanically affected zone, and the fractured position corresponded well with the position with the lowest hardness. The fracture mode of the joint was ductile fracture.
中图分类号 TG453.9 DOI 10.11973/jxgccl201901011
所属栏目 材料性能及应用
基金项目 甘肃省高等学校基本科研业务费资助项目(01-0071)
收稿日期 2017/10/14
修改稿日期 2018/12/6
网络出版日期
作者单位点击查看
备注霍仁杰(1988-),男,辽宁沈阳人,助理讲师,硕士研究生
引用该论文: HUO Renjie,JIN Yuhua,WANG Guangshan,LI Hailong. Microhardness and Tensile Properties of Friction Stir Welded Joint of 2024 Aluminum Alloy at Different Welding Speeds[J]. Materials for mechancial engineering, 2019, 43(1): 50~53
霍仁杰,金玉花,王广山,李海龙. 不同焊接速度下2024铝合金搅拌摩擦焊接头的显微硬度与拉伸性能[J]. 机械工程材料, 2019, 43(1): 50~53
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参考文献
【1】钱红丽, 周琦, 陈俐, 等. 2024铝合金光纤激光焊接头力学性能研究[J]. 焊接, 2013(3):31-33.
【2】岳玉梅,周振鲁,姬书得,等.半螺纹搅拌针对2024铝合金搅拌摩擦搭接焊力学性能影响[J].焊接学报,2016,37(10):69-72.
【3】栾国红.搅拌摩擦焊技术在轨道列车制造中的应用[J]. 焊接, 2015(1):7-12.
【4】HEJAZI I, MIRSALEHI S E. Mechanical and metallurgical characterization of AA6061 friction stir welded joints using microhardness map[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(9):2313-2319.
【5】徐韦锋, 刘金合, 栾国红, 等. 厚板铝合金搅拌摩擦焊接头显微组织与力学性能[J]. 金属学报, 2008, 44(11):1404-1408.
【6】HAO H L, NI D R, HUANG H, et al. Effect of welding parameters on microstructure and mechanical properties of friction stir welded Al-Mg-Er alloy[J]. Materials Science and Engineering:A, 2013, 559:889-896.
【7】MISHRA R S, MA Z Y. Friction stir welding and processing Ⅱ[J]. Materials Science and Engineering:R,2005,50(1):1-78.
【2】岳玉梅,周振鲁,姬书得,等.半螺纹搅拌针对2024铝合金搅拌摩擦搭接焊力学性能影响[J].焊接学报,2016,37(10):69-72.
【3】栾国红.搅拌摩擦焊技术在轨道列车制造中的应用[J]. 焊接, 2015(1):7-12.
【4】HEJAZI I, MIRSALEHI S E. Mechanical and metallurgical characterization of AA6061 friction stir welded joints using microhardness map[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(9):2313-2319.
【5】徐韦锋, 刘金合, 栾国红, 等. 厚板铝合金搅拌摩擦焊接头显微组织与力学性能[J]. 金属学报, 2008, 44(11):1404-1408.
【6】HAO H L, NI D R, HUANG H, et al. Effect of welding parameters on microstructure and mechanical properties of friction stir welded Al-Mg-Er alloy[J]. Materials Science and Engineering:A, 2013, 559:889-896.
【7】MISHRA R S, MA Z Y. Friction stir welding and processing Ⅱ[J]. Materials Science and Engineering:R,2005,50(1):1-78.
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