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首页> 外文期刊>Materials Science and Engineering >Wire arc additive manufacturing of Al-6Mg alloy using variable polarity cold metal transfer arc as power source
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Wire arc additive manufacturing of Al-6Mg alloy using variable polarity cold metal transfer arc as power source

机译:以可变极性冷金属转移电弧为动力源的Al-6Mg合金丝电弧增材制造

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摘要

A variable polarity cold metal transfer (VP-CMT) arc power source with different arc modes was employed in additive manufacturing Al-6Mg alloy parts. The microstructures were characterized using scanning electron microscopy with electron back-scattered diffraction. Even equiaxed grains in size of 20.6-28.5 μm with random orientation were obtained under VP-CMT mode, while a large number of columnar grains in bigger size exist in samples under other arc modes. Tensile strength of the VP-CMT sample with a maximum of 333 MPa is higher than that of the Al-6Mg wrought alloys due to fine-grain strengthening. However, the tensile strength of the VP-CMT sample in different tensile direction was anisotropic, with a percentage of 8-27%. The comprehensive analysis of defects and grain orientation showed that the micro pores in interlayer pore region lead to the anisotropy.
机译:在增材制造Al-6Mg合金零件中使用了具有不同电弧模式的可变极性冷金属转移(VP-CMT)电弧电源。使用扫描电子显微镜和电子背散射衍射对微结构进行表征。在VP-CMT模式下,甚至可以获得20.6-28.5μm大小的随机取向的等轴晶粒,而在其他电弧模式下,样品中也存在大量较大尺寸的柱状晶粒。由于细晶粒强化,VP-CMT样品的最大抗拉强度为333 MPa,高于Al-6Mg变形合金。然而,VP-CMT样品在不同拉伸方向上的拉伸强度是各向异性的,百分比为8-27%。对缺陷和晶粒取向的综合分析表明,层间孔区域中的微孔会导致各向异性。

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