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首页> 外文期刊>Journal of Manufacturing Processes >Interfacial microstructures and mechanical properties of friction welded Al/ steel dissimilar joints
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Interfacial microstructures and mechanical properties of friction welded Al/ steel dissimilar joints

机译：铝/钢异种焊缝的界面组织和力学性能

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摘要

A quality joining of Al alloy to steel is difficult to be obtained by fusion welding processes owing to the large difference between melting temperatures and the formation of thick brittle Al/Fe intermetallic compounds (IMCs) layer at the joint interface. In this study, the 6061 Al alloy and 304 austenitic stainless steel were successfully joined by the continuous drive friction welding under different welding parameters. A sound welded joint with joint efficiency of 88 % and bending angle of 80 degrees was obtained at a low friction time and a high upset pressure, where no detect was found at the interface. The IMCs layer was not formed at the interface, but a thin diffusion zone could be observed, indicating the realization of the metallurgical bonding. Under experimental range, a relatively thinner diffusion zone was recommended to ensure higher joint strength and more excellent bend ductility. The IMCs were identified as Fe2Al5, Fe4Al13 and FeAl2 at fracture surface by XRD. The propagation of cracks during tensile testing concentrated on the area where the IMCs existed. The less amount of IMCs was detrimental for joint properties at a low welding parameters. Fracture analysis showed that the dimple fracture predominated the fracture mode for a sound joint.
机译：由于熔融温度之间的巨大差异以及在接合界面处形成的较厚的脆性Al / Fe金属间化合物（IMC）层之间的差异，很难通过熔焊工艺实现铝合金与钢的优质接合。在这项研究中，通过连续驱动摩擦焊接在不同的焊接参数下成功地结合了6061铝合金和304奥氏体不锈钢。在低摩擦时间和高up锻压力下获得了焊接效率为88％，弯曲角度为80度的良好焊接接头，但在界面处未发现任何缺陷。 IMCs层未在界面处形成，但可以观察到较薄的扩散区，表明实现了冶金结合。在实验范围内，建议使用较薄的扩散区，以确保更高的接头强度和更出色的弯曲延展性。用XRD将IMCs鉴定为断口处的Fe2Al5，Fe4Al13和FeAl2。拉伸测试过程中的裂纹扩展集中在IMC存在的区域。少量的IMC对低焊接参数的接头性能有害。断裂分析表明，酒窝断裂占稳固关节断裂模式的主导。

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