Diminishing residual stress and distortion by in-situ rolling tensioning to increase fatigue performance of friction stir welded AA2024-T3 joints

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-10-19 DOI:10.1016/j.ijfatigue.2024.108659

Pujono , M.N. Ilman , Kusmono , M.R. Muslih , T.H. Priyanto , R. Apriansyah , A. Isnaini

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Abstract

In this research, local mechanical tensioning treatment in the form of in-situ rolling tensioning (ISRT) was applied during friction stir welding of AA2024-T3 sheets. Two types of roller configurations were used. First, a single roller located at the rear of the tool which passed over the weld region and secondly, two rollers were located next to the weld zone symmetrically. Subsequently, several experiments comprising residual stress, distortion and fatigue crack growth (FCG) measurements were carried out combined with microstructure, texture, hardness and tensile tests. Results demonstrated that a single roller ISRT effectively diminished residual stress in the nugget zone (NZ) from + 11.7 MPa to −45.3 MPa accompanied by better weld FCG resistance. Apart from residual stress reduction, the improved weld fatigue performance was likely correlated with the modifications of weld microstructure and texture due to rolling tensioning.

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通过原位滚动拉伸减小残余应力和变形，提高 AA2024-T3 搅拌摩擦焊接接头的疲劳性能

在这项研究中，AA2024-T3 板材的搅拌摩擦焊接过程中采用了原位滚动拉伸（ISRT）形式的局部机械拉伸处理。使用了两种类型的轧辊配置。第一种是位于工具后部的单个辊子穿过焊接区域，第二种是两个辊子对称地位于焊接区域旁边。随后，结合微观结构、纹理、硬度和拉伸测试，进行了多项实验，包括残余应力、变形和疲劳裂纹生长（FCG）测量。结果表明，单辊 ISRT 有效地将金块区 (NZ) 的残余应力从 + 11.7 MPa 减小到 -45.3 MPa，同时提高了焊缝的抗 FCG 能力。除了降低残余应力外，焊接疲劳性能的改善还可能与滚动拉伸导致的焊接微观结构和纹理的改变有关。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.