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Comparative Analysis of Structure and Mechanical Properties of Additive Objects Manufactured by Electron Beam Method and Cold Metal Transfer
Russian Journal of Non-Ferrous Metals ( IF 0.8 ) Pub Date : 2020-10-21 , DOI: 10.3103/s106782122005003x
A. A. Eliseev , V. R. Utyaganova , A. V. Vorontsov , V. V. Ivanov , V. E. Rubtsov , E. A. Kolubaev

Abstract

Nowadays prototyping and additive manufacturing of objects are the most promising trends of development. As opposed to more precise powder methods, particular attention has been given to faster wire techniques, which allow manufacturing of objects without pores. This work compares the influence of two wire techniques, electron beam additive manufacturing and cold metal transfer, on the structure and mechanical properties of AMg5 aluminum alloy. Under optimum printing parameters, the powers of the electron beam and arc were close, however, due to the pulse pattern of the arc, the cold metal transfer was more cost efficient. In addition, the arc technique is carried out in an argon environment, which accelerates cooling of the applied layer. Generally, due to lower heat input and accelerated cooling, the grain structure is refined, which leads to an increase in strength and microhardness. Due to continuous removal from the substrate and an increase in the weight of the object, the heat conditions of application of the next layer vary, which is controlled by a decrease in beam/arc power. That said, each layer is characterized by its thermal history, thus influencing the structure and properties of the material. In particular, the higher the heat amount accepted by a layers from previous layers, the lower its strength. When a certain height is crossed (about 30 mm) the cooling is intensified, due to the higher weight of the object, and the strength increases again. This is the most characteristic for cold metal transfer. However, these oscillations are rather moderate; the mechanical properties along the height are highly stable in both techniques. In addition, in the case of cold metal transfer, burning of alloying magnesium is lower. In general, at present, the cold metal transfer is more cost efficient and allows one to manufacture objects of higher quality.



中文翻译:

电子束法和冷金属转移法制造添加物的结构和力学性能比较分析

摘要

如今,物体的原型制作和增材制造是最有希望的发展趋势。与更精确的粉末方法相反,特别关注的是更快的线材技术,该技术允许制造没有孔的物体。这项工作比较了两种线技术(电子束增材制造和冷金属转移)对AMg5铝合金的结构和力学性能的影响。在最佳打印参数下,电子束和电弧的功率接近,但是,由于电弧的脉冲模式,冷金属转移的成本效益更高。另外,电弧技术在氩气环境中进行,这加速了施加层的冷却。通常,由于较低的热量输入和加速的冷却,晶粒结构得以细化,这导致强度和显微硬度的增加。由于不断从基板上移走并增加了物体的重量,因此下一层施加的加热条件会发生变化,这由光束/电弧功率的降低来控制。也就是说,每个层的特征都在于其热历史,因此会影响材料的结构和性能。特别地,层从先前的层接受的热量越高,其强度越低。当超过一定高度(约30毫米)时,由于物体的重量增加,冷却作用增强,强度再次提高。这是冷金属转移的最典型特征。但是,这些振荡是相当适度的。在这两种技术中,沿高度的机械性能都非常稳定。此外,在冷金属转移的情况下,镁合金的燃烧降低。通常,目前,冷金属转移具有更高的成本效益,并且可以制造更高质量的物体。

更新日期:2020-10-30
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