喷丸处理对2219铝合金搅拌摩擦焊接残余应力场再分布的影响

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy.

作者信息

Nie Lin, Wu Yunxin, Gong Hai, Chen Dan, Guo Xudong

机构信息

School of Mechanical and Electronic Engineering, Central South University, Changsha 410083, China.

State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2020 Jul 16;13(14):3169. doi: 10.3390/ma13143169.

DOI:10.3390/ma13143169

PMID:32708581

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7411698/

Abstract

Welding is one of the essential stages in the manufacturing process of mechanical structures. Friction stir welding structure of aluminum alloy has been used as a primary supporting member in aerospace equipment. However, friction stir welding inevitably generates residual stress that promotes the initiation and propagation of cracks, threatening the performance of the welded structure. Shot peening can effectively change the distribution of residual stress and improve the fatigue properties of materials. In this paper, friction stir welding and shot peening are performed on 2219 aluminum alloy plates. The residual stress fields induced by friction stir welding and shot peening are measured by using the X-ray diffraction method and incremental center hole drilling method, and the distribution characteristics of residual stress fields are analyzed. The effect of the pellet diameters and pellet materials used in shot peening on the redistribution of welding residual stress field are investigated. The pellet diameter used in the experiment is in the range of 0.6-1.2 mm, and the pellet material includes glass, steel, and corundum. This study provides guidance for the application of shot peening in friction stir welding structure of 2219 aluminum alloy.

摘要

焊接是机械结构制造过程中的关键阶段之一。铝合金搅拌摩擦焊接结构已被用作航空航天设备的主要支撑部件。然而，搅拌摩擦焊接不可避免地会产生残余应力，促进裂纹的萌生和扩展，威胁焊接结构的性能。喷丸处理可以有效地改变残余应力的分布，提高材料的疲劳性能。本文对2219铝合金板材进行了搅拌摩擦焊接和喷丸处理。采用X射线衍射法和增量中心孔钻削法测量了搅拌摩擦焊接和喷丸处理引起的残余应力场，并分析了残余应力场的分布特征。研究了喷丸处理中使用的弹丸直径和弹丸材料对焊接残余应力场再分布的影响。实验中使用的弹丸直径在0.6 - 1.2毫米范围内，弹丸材料包括玻璃、钢和刚玉。本研究为喷丸处理在2219铝合金搅拌摩擦焊接结构中的应用提供了指导。