Effects of Friction Stir Welding Process Parameters on Welded Seam Forming and Mechanical Properties of Welded Joint for 2198 Al-Li Alloy
摘 要
对2198铝锂合金薄板进行了搅拌摩擦焊试验, 分析了搅拌头旋转速度和焊接速度对焊缝成形及接头力学性能的影响。结果表明: 旋转速度(n)与焊接速度(v)的比值大于15.7时, 能形成表面成形良好, 且内部致密无缺陷的焊缝; 接头焊核区形成了细小的等轴晶, 前进侧热力影响区大部分为等轴状晶粒, 后退侧热力影响区的板条状组织发生了变形, 其周围出现了细晶粒; 焊接速度为30 mm·min-1时, 接头的抗拉强度随旋转速度的增大而变小, 其最大值为432.17 MPa, 焊缝的硬度低于母材的, 热力影响区的硬度最低, 焊核区的硬度略高于热力影响区的。随着n/v的增大, 热影响区的软化区间变宽。
Abstract
The friction stir welding test was performed on 2198 Al-Li alloy sheet, and the effects of rotation rate and welding rate of friction stir tool on welded seam forming and mechanical properties of welded joint were analyzed. The results show that when the ratio of rotation rate to welding rate was more than 15.7, a compact welded seam with good forming surface and free of defects was obtained. The microstructure in nugget zone was fine equiaxed grains, and the microstructure of heat-mechanical affected zone at advancing side was almost small equiaxed grains, and the lath structure of heat-mechanical affected zone at the retreating side deformed, there were small grains around the lath microstructure. The tensile strength of the joints decreased with the increase of rotation rate when the welding rate was 30 mm·min-1, and the maximal tensile strength was 432.17 MPa. The hardness of the welded seam was lower than that of the base metal, and the hardness of nugget zone was little higher than that of heat-mechanical affected zone, and the hardness of heat-mechanical affected zone was the lowest. The softened range of heat affected zone became wider with the increase the ratio of rotation rate to welding rate.
中图分类号 TG453.9 TG146.2
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(50875119); 江西省自然科学基金资助项目(0450090); 江西省科技厅重点工业发展项目(BC200201014)
收稿日期 2011/6/9
修改稿日期 2012/2/22
网络出版日期
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备注宋骁(1988-), 男, 江西萍乡人, 硕士研究生。
引用该论文: SONG Xiao,XING Li,HUANG Chun-ping,WANG Shan-lin. Effects of Friction Stir Welding Process Parameters on Welded Seam Forming and Mechanical Properties of Welded Joint for 2198 Al-Li Alloy[J]. Materials for mechancial engineering, 2012, 36(7): 28~31
宋骁,邢丽,黄春平,王善林. 搅拌摩擦焊工艺参数对2198铝锂合金焊缝成形及接头力学性能的影响[J]. 机械工程材料, 2012, 36(7): 28~31
被引情况:
【1】陈吉,邓慕阳,陈科,张澜庭,单爱党, "铝板搅拌摩擦加工后原位自生第二相颗粒及焊核区晶粒尺寸",机械工程材料 40, 5-8(2016)
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参考文献
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【2】刘兵, 彭超群, 王日初, 等.大飞机用铝合金的研究现状及展望[J].中国有色金属学报, 2010, 20(9):1705-1715.
【3】杨章跃, 曾萱.C919机身等直段部段在洪都下线-铝锂合金材料首次在国内民机制造上应用[J].中国军转民, 2010(12):78-79.
【4】冯吉才, 王大勇, 王攀峰.锥形光头搅拌针搅拌摩擦焊接铝锂合金接头组织及力学性能[J].中国机械工程, 2004, 15(10):932-934.
【5】方文鹏, 杜晓伟, 潘庆军.新技术在铝锂合金焊接中的应用[J].现代焊接, 2008(2):17-19.
【6】THOMAS W M, NORRIS I M, STAINES D G, et al. Friction stir welding-process developments and variant techniques[R].[2011-06-01].http://www4.twi.co.uk/private/rg/wt-fsw/pdf.
【7】王大勇, 冯吉才, 王攀峰.铝锂合金搅拌摩擦焊研究[J].材料科学与工程学报, 2005, 23(3):369-372.
【8】柯黎明, 邢丽, 黄奉安.搅拌摩擦焊接头形成过程的二维观察与分析[J].焊接学报, 2005, 26(3):1-4.
【9】史清宇, 王细波, 康旭, 等.搅拌摩擦焊温度场[J].清华大学学报, 2010, 50(7):980-983.
【10】CAVALIERE P, CABIBBO M, PANELLA F, et al. 2198 Al-Li plates joined by friction stir welding: mechanical and microstructural behavior[J].Materials and Design, 2009, 30(9):3622-3631.
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