超声冲击对高强铝合金搅拌摩擦焊接接头疲劳机制影响的研究进展

Research progress of ultrasonic impact on fatigue mechanism of friction stir welding joint of high strength aluminum alloys

疲劳破坏常源于材料表面及次表面,同时也是材料最主要的失效方式,搅拌摩擦焊接结构也不例外。因此,提升焊接接头表面性能对于提高焊接接头疲劳寿命显得尤为重要。超声冲击处理技术作为一种新型表面后处理技术,对焊接接头疲劳性能的影响机制受到广泛关注与研究。作者对超声冲击改善搅拌摩擦焊焊接接头应力集中、残余应力、微观组织、不同超声冲击参数对接头疲劳性能的影响以及数值模拟技术与应力-寿命曲线在整个研究过程中的应用等方面进行综述,并展望超声冲击处理技术未来的研究方向。

Fatigue damage often originates from the surface and subsurface of the material,and is also the main failure mode of the material. So do the friction stir welding structure.Therefore,improving the surface properties of the welded joint is particularly important for improving the fatigue life of welded joints. As a new type of surface post-treatment technology,the effects of ultrasonic impact treatment technology on the mechanism of the fatigue properties of joints has received extensive attention and research. In this paper,the effects of ultrasonic shock on improving stress concentration and residual stress of welded joints,improving the microstructure of materials,different ultrasonic impact parameters on the fatigue performance of friction stir welded joints,the application of numerical simulation technology and stress-life curves in the whole research process are reviewed. The future research direction of ultrasonic shock treatment technology is prospected.