对2024铝合金板进行不同参数下搅拌摩擦焊接，分析了焊缝表面组织，检查了在EXCO溶液中焊缝表面的腐蚀行为，并讨论硬度分布与腐蚀发生的关系．结果表明，焊后轴肩作用区晶粒细化明显．随转速的增加，焊缝上表面热影响区范围加宽、轴肩作用区硬度上升、耐蚀性能提高．在转速1500r／min、行进速度1000mm／min下所得焊缝金属塑性流动剧烈，轴肩作用区硬度值已接近母材的硬度值，在EXCO溶液中浸泡10h后仅发生点蚀．与母材相比，接头硬度的软化区是腐蚀发生的区域，但硬度值最低的位置与腐蚀最严重的区域没有严格的对应关系．
Friction stir welding （FSW） for 2024 aluminum alloy sheets was conducted by different processing parameters. The microstructure of the surface and the corrosion behavior in EXCO solution of joints were investigated. The correlation between the micro-hardness profile and the corrosion sensitive region was discussed. The results show that grains in the shoulder active zone （SAZ） are obviously refined. With increasing the rotation speed, the spans of heat-affected zone （HAZ） widens, furthermore, the hardness of the SAZ increases and the corrosion resistance of this region enhances. When the rotation speed is 1500 r/rain and weld speed is 1000 mm/min, the plasticity metal flow is more intensive, and the hardness value of the SAZ comes up almost to that of-the base metal, therewith, only pitting corrosion occurred in the joint after being immersed 10 h in EXCO solution. Compared with the base metal, the softened zone coincides with the corrosion sensitive region. However, there is not strict correlation.
参考文献
| [1] | Matrukanitz R P. Selection and weldability of heat-treatable aluminum alloys, ASM Handbook-Welding, Brazing and Soldering[M]. ASM Int, 1990: 528. |
| [2] | 王希靖,孙桂苹,张杰等.焊后热处理对高强铝合金搅拌摩擦焊接头的影响[J].中国有色金属学报,2009,20(3):484. |
| [3] | Mishra R S, Ma Z Y. Friction stir welding and processing[J]. Mater. Sci. Eng., 2005, R50: 1. |
| [4] | Xu W F, Liu J H, Luan G H, et al. Temperature evolution, microstructure and mechanical properties of friction stir welded thick 2219-O aluminum alloy joints[J]. Mater. Des., 2009, 30: 1886. |
| [5] | Cavaliere P, Cerri E, Squillace A. J. Mechanical response of 2024-7075 aluminium alloys joined by Friction Stir Welding[J]. Mater. Sci., 2005, 40: 3669. |
| [6] | 柴鹏,栾国红,郭德伦等.FSW接头残余应力分布及控制技术[J].焊接学报,2005,26(11):79. |
| [7] | 赵衍华,林三宝,吴林.2014铝合金搅拌摩擦焊接过程塑性金属流变可视化[J].焊接学报,2005,26(6):73. |
| [8] | Lu S X, Yan J C, Li W G, et al. Simulation on temperature field of friction stir welded joints of 2024-T4 Al[J]. Acta Metall. Sinica, 2005, 18: 552. |
| [9] | 栾国红,付瑞东,董春林等.中性盐雾下7075铝合金搅拌摩擦焊焊缝的腐蚀行为[J].中国腐蚀与防护学报,2010,30(3):236. |
| [10] | Jariyaboon M, Davenport A J, Ambat R, et al. The effect of welding parameters on the corrosion behavior of friction stir welded AA2024-T351 [J]. Corros. Sci., 2007, 49: 877. |
| [11] | Surekha K, Murty B S, Prasad R K. Microstructural characterization and corrosion behavior of multipass friction stir processed AA2219 aluminium alloy[J]. Surf. Coat. Technol.. 2008, 202: 4057. |
| [12] | Kang J, Fu R D, Luan G H, et al. In-situ investigation on the pitting corrosion behavior of friction stir welded joint of AA2024-T3 aluminium alloy[J]. Corros. Sci., 2010, 52: 620. |
| [13] | Omar H. Effects of peening on mechanical properties in friction stir welded 2195 aluminum alloy joints[J]. Mater. Sci. Eng., 2008, A492: 168. |
| [14] | 黄光杰,汪凌云.热处理对2024铝合金组织和性能的影响[J].重庆大学学报(自然科学版),2000,23(4):99. |
| [15] | ASTM G34-01. Standard test method for exfoliation corrosion susceptibility in 2x x x and 7x x x series aluminum alloys (EXCO Test) [S]. |
| [16] | 付瑞东,栾国红,董春林等.酸性盐雾中7075铝合金搅拌摩擦焊接头的腐蚀行为[J].腐蚀科学与防护技术,2009,21(6):580. |
| [17] | Yang B S, Yan J H, Michael S A, et al. Banded microstructure in AA2024-T351 and AA2524-T351 aluminum friction stir welds. Part I. Metallurgical studies[J]. Mater. Sci. Eng., 2004, A364: 55. |
| [18] | Michael S A, Yang B S, Anthony R P, et al. Banded mi- crostructure in 2024-T351 and 2524-T351 aluminum friction stir welds. Part II. Mechanical characterization[J]. Mater. Sci. Eng., 2004, A364: 66. |
| [19] | Yutaka S S, Mitsunori U, Hiroyuki K. Hall-Petch relation-ship in friction stir welds of equal channel angular-pressed aluminium alloys[J]. Mater. Sci. Eng., 2003, A354: 298. |
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