铝合金静止轴肩搅拌摩擦焊组织非均质性对接头力学性能的影响
Effect of microstructural inhomogeneity on mechanical properties of stationary shoulder friction stir welded joints for 6061-T6 aluminum alloy
-
摘要: 对6061-T6铝合金静止轴肩搅拌摩擦焊(stationary shoulder friction stir welded， SSFSW)接头组织非均质性与力学性能的相互影响进行了定量分析. 结果表明，SSFSW焊接接头存在明显的组织非均质性，表现在晶粒尺寸及形状、沉淀相种类及分布形态不同，其中沉淀相析出不同是影响力学性能差异的主要因素. 由于组织非均质性导致紧邻焊核区的热影响区软化严重，其硬度和抗拉强度在接头区域最低，分别为母材的60%和72%，为接头最薄弱部分. 由于沉淀强化和晶粒细化效应，焊核区的强度与塑性最好，而抗拉强度和断后伸长率分别达到母材的88%和215%. 随着与焊核区距离的增加，热影响区抗拉强度和屈服强度逐渐增加，断后伸长率不断降低.
-
关键词:
- 6061-T6铝合金 /
- 静止轴肩搅拌摩擦焊 /
- 组织非均质性 /
- 力学性能
Abstract: The relationship between microstructural inhomogeneity and mechanical properties of the stationary shoulder friction stir welded (SSFSW) joint for 6061-T6 aluminum alloy was investigated. Results show that there is existing obviously microstructural inhomogeneity in the SSFSW joints, which reflected in the different grain size and shape, morphology and distribution of precipitates. It should be noted that the different precipitates is the major factor of the mechanical properties variation. Resulting from the microstructural inhomogeneity, the HAZ which is closed to the NZ was softened seriously, and its hardness and tensile strength were the lowest in the joint, reaching at 60% and 72% of the base metal, respectively. The strength and plasticity of the NZ are the best in the joint because of the precipitation strengthening and finegrain strengthening, and the tensile strength and elongation of the NZ reach at 88% and 215% of base metal, respectively. With the distance from NZ increasing, the ultimate tensile strength and yield strength of microtensile specimens increase, while the elongation of samples decreases. -
-
[1] Gibsona B T, Lammlein D H, Prater T J,etal. Strauss friction stir welding: process, automation, and control[J]. Journal of Manufacturing Processes, 2014(16): 56-73.[2] 刘会杰, 李金全, 段卫军. 静止轴肩搅拌摩擦焊的研究进展[J]. 焊接学报, 2012, 33 (5): 108-112. Liu Huijie, Li Jinquan, Duang Weijun. Progress in the stationary shoulder friction stir welding[J]. Transactions of the China Welding Institution, 2012, 33(5): 108-112.[3] 白景彬, 杜岩峰, 田志杰, 等. 2219铝合金搅拌摩擦焊接头组织与力学性能的不均匀性[C]∥第十六次全国焊接学术会议论文摘要集, 江苏： 2011.[4] 张 昭, 刘亚丽, 陈金涛, 等. 搅拌摩擦焊接过程中材料流动形式[J]. 焊接学报, 2007, 28 (11): 17-21. Zhang Zhao, Liu Yali, Chen Jintao,etal. Material flow patterns in friction stir welding[J]. Transactions of the China Welding Institution, 2007, 28(11): 17-21.[5] Li D X, Yang X Q, Cui L,etal. Effect of welding parameters on microstructure and mechanical properties of AA6061-T6 butt welded joints by stationary shoulder friction stir welding[J]. Materials and Design, 2014(64): 251-260. -
期刊类型引用(7)
1. 张亮亮，刘致远，剡晓旭. 轴肩构型对6082铝合金搅拌摩擦焊温度场的影响. 甘肃高师学报. 2024(05): 23-27 . 
百度学术
2. 杨新岐，元惠新，孙转平，闫新中，赵慧慧. 铝合金厚板静止轴肩搅拌摩擦焊接头组织及性能. 材料工程. 2022(07): 128-138 . 百度学术
3. 闫新中，杨新岐，唐文珅，赵慧慧，郭立杰. 2A14厚板铝合金SSFSW角焊缝接头组织及性能. 机械工程学报. 2022(22): 186-197 . 百度学术
4. 赖鸥，谭元冰，胡伟，马蓉. 铝合金搅拌摩擦焊与双轴肩搅拌摩擦焊接接头疲劳性能对比试验. 新型工业化. 2019(03): 54-57 . 百度学术
5. 郝云飞，马建波，毕煌圣，李超，王国庆. 铝合金T形接头静止轴肩搅拌摩擦焊接及组织性能分析. 焊接学报. 2019(07): 48-54+163 . 本站查看
6. 曾申波，陈高强，张弓，史清宇. T形接头角接静轴肩搅拌摩擦焊三维流动特征. 焊接学报. 2019(12): 1-5+161 . 本站查看
7. 张华，赵常宇，林三宝，石功奇. 7050-T7451铝合金静轴肩搅拌摩擦焊接头组织与性能研究. 焊接. 2018(09): 5-9+65 . 百度学术
其他类型引用(5)
计量
- 文章访问数: 1001
- HTML全文浏览量: 33
- PDF下载量: 483
- 被引次数: 12
下载:
