打磨粒度对A5083铝合金焊接接头力学及疲劳性能的影响
李春广1，云中煌1，金文涛1，戴忠晨1，吴斌1，苟国庆2，覃超2
（1.南车南京浦镇车辆有限公司，江苏 南京 266111；2.西南交通大学 材料科学与工程学院，四川 成都 610031）
摘要：对A5083铝合金焊接接头采用不同粒度的打磨片进行打磨，研究了打磨后焊接接头的拉伸性能和疲劳性能差异，并分析其断口形貌与疲劳性能的关系。80目打磨片条件下的焊接接头拥有最大的抗拉强度以及最高的延伸率，而40目打磨片条件下试样的疲劳极限最高。对疲劳断口进行扫描电镜（SEM）观察，发现裂纹源均为焊缝区的焊接缺陷。研究结果表明，打磨片粒度对A5083铝合金焊接接头的拉伸性能和疲劳性能没有明显影响，焊接接头的质量是其力学性能的主要影响因素。
关键词：A5083铝合金；打磨粒度；力学性能；疲劳性能
中图分类号：TG40 文献标志码：A doi：10.3969/j.issn.1006-0316.2016.05.004
文章编号：1006－0316 (2016) 05－0014－04
Effect of grinding granularity on mechanical and fatigue properties of welded joints of A5083 aluminum alloys
LI Chuanguang1，YUN Zhonghuang1，JIN Wentao1，DAI Zhongchen1，WU Bin1，GOU Guoqing2，QIN Chao2
( 1.CSR Nanjing Puzhen Co., Ltd., Nanjing 266111, China; 2.School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China )
Abstract：The welded joints of A5083 were fabricated and the tensile properties, fatigue properties and the relationship between fracture characteristics and fatigue properties were investigated. the samples under 80 number grinding granularity had the best tensile strength and elongation rate, but the samples under 40 number grinding granularity had the best fatigue properties. The fracture characteristics were investigated by scanning electron microscopy (SEM), which found that crack source all were weld defects. The results showed that the different grinding granularity do not have obvious effect on the tensile strength and fatigue properties of A5083 aluminum alloys and the welding quality is still a major factor affecting the mechanical properties of welded joints.
Key words：A5083 aluminum alloys；grinding granularity；mechanical properties；fatigue properties
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收稿日期：2015－09－14
基金项目：铝合金打磨方向和调修温度对疲劳性能影响研究（CGKY 14－002）
作者简介：李春广（1980－），男，吉林省吉林市人，硕士研究生，高级工程师，主要从事轨道车辆工艺管理及工艺设计开发工作。
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