Material-property evaluation of magnesium alloys fabricated using wire-and-arc-based additive manufacturing
Material-property evaluation of magnesium alloys fabricated using wire-and-arc-based additive manufacturing
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DOI：
10.1016/j.addma.2018.10.026
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发表时间：
2018-12-01
影响因子：
11
通讯作者：
Nakamura, Kunimitsu
中科院分区：
文献类型：
--
作者：
Takagi, Hisataka;Sasahara, Hiroyuki;Nakamura, Kunimitsu
已经检查了使用基于焊丝和电弧的增材制造技术制造的镁合金部件的材料特性，例如孔隙率、拉伸强度和微观结构，所述增材制造技术基本上代表电弧焊接技术的一种形式。在所提出的方法中，线材通过电弧放电熔化，随后熔融金属凝固并积聚。本研究中开发的镁丝有助于使用所述增材制造工艺制造镁合金部件。随后，探索了制造条件的组合，例如焊接电流、焊炬进给速度和焊炬的横向进给，并且确定了用于实现与使用压铸和其他制造方法时观察到的焊接缺陷相比具有较少焊接缺陷的实心结构的合适条件。拉伸试验和显微组织观察也进行了阐明镁合金部件的机械性能，通过上述线和电弧为基础的技术制造。结果表明，制造的物体具有足够的拉伸强度相比，观察到的标准值的散装材料。此外，显微组织观察的结果表明，焊炬进给速度越高，显微组织越细。此外，观察到的微观结构之间的边界处的基板和制造的对象是精细的相比，在顶层。
Material properties, such as porosity, tensile strength, and microstructure, of magnesium-alloy components fabricated using wire-and-arc-based additive-manufacturing techniques, which essentially represent a form of arc-welding technology have been examined. In the proposed method, the wire material is melted by arc discharge, and the molten metal is subsequently solidified and accumulated. Magnesium wire developed in this study facilitated fabrication of magnesium-alloy components using the said additive-manufacturing process. Subsequently, combinations of fabrication conditions, such as the welding current, torch feed speed, and cross feed of the torch, were explored, and suitable conditions for realizing a solid structure with fewer weld defects compared to those observed when using die-casting and other manufacturing methods, were determined. Tensile tests and microstructure observations were also performed to elucidate mechanical properties of magnesium alloy components fabricated via the said wire-and-arc-based technique. It was demonstrated that the fabricated object possesses sufficient tensile strength compared to the observed standard value of the bulk material. Furthermore, results from microstructure observations demonstrated that the higher the torch feed speed, the finer is the microstructure. Moreover, the observed microstructure at the boundary between the substrate and fabricated object was finer compared to that at the top layer.