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Non-uniformity of intermetallic compounds and properties in inertia friction welded joints of 2A14 Al alloy to 304 stainless steel
Journal of Manufacturing Processes ( IF 6.1 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.jmapro.2021.06.019
Da Zhang , Guoliang Qin , Hong Ma , Peihao Geng

Inertia friction welding (IFW) is attracting considerable attention in recent years for dissimilar metals joining such as aluminum (Al) alloy to stainless steel due to its ease to control heat input accurately. As a result of thermo-mechanical conditions, the microstructure at the friction interface, especially the brittle IMCs, is usually considered to be non-uniformly distributed. In the present study, the non-uniformity of IMCs at different interfacial regions in the IFWed joint and the diffusion bonded joint was comparatively studied by annealing experiments with tensile tests conducted accordingly for quantitatively evaluating the influence of IMCs thickness on the bonding properties. Following the heat treatment, unlike diffusion bonded joints, different growth behavior of IMCs at different interfacial positions of the IFWed joint was observed, which deviated with a varying degree from the parabolic diffusion law. The phenomenon indicated a non-uniform distribution of energy storage along friction interface after welding, resulting from the unique thermo-mechanical conditions in the friction welding process. Moreover, the highest bonding strength appeared at the central interface region where no obvious IMCs layer was founded in the as-welded joint, and a negative correlation between IMCs thickness layer and bonding strength was observed. Therefore, for designing a high-performance Al/steel IFWed joint, the distribution and the corresponding thickness of IMCs should be carefully considered.



中文翻译:

2A14铝合金-304不锈钢惯性摩擦焊接头金属间化合物的不均匀性及性能

近年来,惯性摩擦焊接 (IFW) 因其易于准确控制热量输入而在将铝 (Al) 合金等异种金属连接到不锈钢方面引起了相当大的关注。由于热机械条件,摩擦界面处的微观结构,尤其是脆性 IMC,通常被认为是非均匀分布的。在本研究中,IFWed 接头和扩散接合接头不同界面区域 IMC 的不均匀性通过退火实验和拉伸试验进行了比较研究,以定量评估 IMC 厚度对接合性能的影响。热处理后,与扩散接合接头不同,在IFWed接头的不同界面位置观察到IMCs的不同生长行为,这与抛物线扩散定律有不同程度的偏离。这种现象表明,由于摩擦焊接过程中独特的热机械条件,焊接后沿摩擦界面的能量存储分布不均匀。此外,最高的结合强度出现在中心界面区域,在焊接接头中没有明显的 IMCs 层,并且观察到 IMCs 厚度层和结合强度之间呈负相关。因此,为了设计高性能的铝/钢 IFWed 接头,应仔细考虑 IMC 的分布和相应的厚度。这种现象表明,由于摩擦焊接过程中独特的热机械条件,焊接后沿摩擦界面的能量存储分布不均匀。此外,最高的结合强度出现在中心界面区域,在焊接接头中没有明显的 IMCs 层,并且观察到 IMCs 厚度层和结合强度之间呈负相关。因此,为了设计高性能的铝/钢 IFWed 接头,应仔细考虑 IMC 的分布和相应的厚度。这种现象表明,由于摩擦焊接过程中独特的热机械条件,焊接后沿摩擦界面的能量存储分布不均匀。此外,最高的结合强度出现在中心界面区域,在焊接接头中没有明显的 IMCs 层,并且观察到 IMCs 厚度层和结合强度之间呈负相关。因此,为了设计高性能的铝/钢 IFWed 接头,应仔细考虑 IMC 的分布和相应的厚度。结合强度最高出现在中心界面区域,在焊接接头处没有明显的 IMCs 层,并且观察到 IMCs 厚度层与结合强度呈负相关。因此,为了设计高性能的铝/钢 IFWed 接头,应仔细考虑 IMC 的分布和相应的厚度。结合强度最高出现在中心界面区域,在焊接接头处没有明显的 IMCs 层,并且观察到 IMCs 厚度层与结合强度呈负相关。因此,为了设计高性能的铝/钢 IFWed 接头,应仔细考虑 IMC 的分布和相应的厚度。

更新日期:2021-06-18
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