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Investigation of friction stir welding process applied to ASTM 572 steel plate cladded with Inconel®625
Welding in the World ( IF 2.1 ) Pub Date : 2020-11-16 , DOI: 10.1007/s40194-020-01007-w
Renan Mensch Landell , Cleber Rodrigo de Lima Lessa , Luciano Bergmann , Jorge Fernandez dos Santos , Carlos Eduardo Fortis Kwietniewski , Benjamin Klusemann

This study investigates friction stir welding (FSW) in the dissimilar joining process of cladded plates. Samples of 4-mm thick ASTM 572 steel plate cladded with 3-mm thick Inconel®625 represent the base material. In order to limit mixing between the dissimilar materials to keep the corrosion resistance, a two-pass welding procedure was applied. Optimal welding parameters for each pass were identified. The welded specimens were evaluated by light microscopy, SEM equipped with EDS, and mechanical tests such as hardness, bending, and tensile testing. Defect-free joints with excellent surface finish have been obtained with a well-defined interfacial region between both materials. The FSW process changed the microstructure of both metals used in this study to a new refined grain region into the weld with complex microstructure inside the ASTM 572 steel, as well as change from a dendritic to an equiaxial microstructure in the Inconel®625. The breaking and the distribution of the intermetallic and secondary phases of the nickel alloy were promoted by the FSW process, moreover the second welding pass on the Inconel® tempered the steel which had previously been welded in the first FSW weld pass. The mechanical properties within the welding zone increased due to this microstructural rearrangement coupled with the Hall-Petch effect.



中文翻译:

对涂有Inconel®625的ASTM 572钢板进行摩擦搅拌焊接工艺的研究

这项研究调查了在覆层板的不同连接过程中的搅拌摩擦焊(FSW)。以4毫米厚的ASTM 572钢板包裹3毫米厚的Inconel®625的样品为基础材料。为了限制异种材料之间的混合以保持耐腐蚀性,采用了两道焊工艺。确定了每个焊道的最佳焊接参数。通过光学显微镜,配备EDS的SEM和机械测试(例如硬度,弯曲和拉伸测试)对焊接的样品进行评估。两种材料之间均具有明确的界面区域,从而获得了具有出色表面光洁度的无缺陷接头。FSW工艺将本研究中使用的两种金属的微观结构更改为一个新的细化晶粒区域,使之成为ASTM 572钢内部具有复杂微观结构的焊缝,以及在Inconel®625中从树枝状转变为等轴显微结构。FSW工艺促进了镍合金的金属间相和第二相的破坏和分布,此外,Inconel®回火的第二道焊缝回火了先前在第一道FSW焊道中焊接过的钢。由于这种微观结构的重新排列以及霍尔-帕奇效应,焊接区内的机械性能得以提高。

更新日期:2020-11-17
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