Interfacial inhomogeneous plastic deformation during rotary friction welding of dissimilar AA2219-SS321 joint combination with AA6061 interlayer

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

This research investigates the inherent radial non-uniformity within the rotary friction welding process, particularly concerning microstructure attributes like grain size, grain boundaries, misorientation angles, and interlayer presence along the radial axis. SS321-AA2219 rotary friction welding was carried out with and without an AA6061 interlayer. The numerical thermal model suggests increase in temperatures from the center to the periphery, due to non-uniform heat generation. Also, dissimilar material across the interface resulted in an asymmetric temperature profile along axial direction. Plastic deformation on the Aluminum side suggests dynamic recrystallization and grain refinement, whereas pronounced low-angle grain boundary (LAGB) formation near the SS side interface validates dynamic recovery. A radial non-uniformity in microstructure is observed, with metrics such as average grain size, LAGB fraction, and misorientation showing an increase from the center towards the periphery. The insertion of an interlayer alters process dynamics, manifesting in reduced temperatures and heightened forces, resulting in a more consolidated joint by enhancing the strength by 31 %. Interdiffusion of elements across the interface formed Fe-Al intermetallic compounds (IMC) confirmed with X ray diffraction. Fractography analysis elucidates the presence of rubbing marks and facet surfaces in interlayer-less joints, while joints with interlayer display sticking and dimples.

带有 AA6061 中间膜的异种 AA2219-SS321 接头旋转摩擦焊接过程中的界面不均匀塑性变形
本研究调查了旋转摩擦焊过程中固有的径向不均匀性,特别是沿径向轴线的晶粒尺寸、晶界、错位角和夹层存在等微观结构属性。在有 AA6061 夹层和没有 AA6061 夹层的情况下进行了 SS321-AA2219 旋转摩擦焊。数值热模型表明,由于发热不均匀,温度从中心向周边升高。此外,界面上的异种材料导致沿轴向的温度分布不对称。铝侧的塑性变形表明了动态再结晶和晶粒细化,而 SS 侧界面附近明显的低角度晶界(LAGB)形成则验证了动态恢复。观察到微观结构的径向不均匀性,平均晶粒大小、LAGB 分数和取向偏差等指标显示出从中心向外围增加的趋势。中间层的插入改变了工艺动态,表现为温度降低和作用力增加,从而使接头更加牢固,强度提高了 31%。X 射线衍射证实,元素在界面上的相互扩散形成了铁铝金属间化合物(IMC)。碎裂分析表明,无夹层的接合处存在摩擦痕迹和刻面,而有夹层的接合处则出现粘连和凹陷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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