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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effects of Low Frequency on the Microstructure and Mechanical Properties of High-Strength Al-Mg Aluminum Alloys by Wire and Double-Pulsed Arc Additive Manufacturing
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The Effects of Low Frequency on the Microstructure and Mechanical Properties of High-Strength Al-Mg Aluminum Alloys by Wire and Double-Pulsed Arc Additive Manufacturing

机译：低频对电线高强度Al-Mg铝合金微观结构和力学性能的影响

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摘要

An innovative and high deposition efficiency process, the double-pulsed arc additive manufacturing process, is used to produce high-strength Al-Mg wall components. This dissertation investigates the electrical parameter acquisition, bead appearance, porosity morphology, microstructure and mechanical properties of additively manufactured high-strength Al-Mg wall components and how these are affected by the low frequency of the double-pulsed arc additive manufacturing process. Then, using this process at different low frequencies of 0, 1, 3, 5, 7 and 9Hz, multilayer deposition experiments were performed. It can be observed that the deposit porosity is obviously eliminated compared with cold metal transfer (CMT) process. The bead appearance of the deposited aluminum wall varies clearly with low frequencies, and at a low frequency of 3Hz, its appearance is the best of all. The optical observation of microstructure proves that the average grain size varies significantly with low frequency, and at a low frequency of 1Hz, it is the smallest. In addition, the deposited wall showed maximum mean microhardness and maximum ultimate tensile strength at a low frequency of 3Hz. Considering the deposited porosity and mechanical priorities, double-pulsed arc additive manufacturing with a frequency of 3Hz is more suitable for making high-strength Al-Mg wall components than at other low frequencies.
机译：一种创新和高沉积效率过程，双脉冲电弧添加剂制造工艺用于生产高强度Al-Mg壁组分。本文研究了电气参数采集，珠子外观，孔隙率形态，微观结构和机械性能的碱性制造的高强度Al-Mg壁组分以及这些粉末的低频频率的影响。然后，在0,1,3,5,7和9Hz的不同低频下使用该过程，进行多层沉积实验。可以观察到，与冷金属转移（CMT）工艺相比，明显消除了沉积孔隙率。沉积的铝壁的珠子外观随着低频而明显的变化，并且在3Hz的低频频率下，其外观是最好的。微观结构的光学观察证明，平均晶粒尺寸随着低频而变化显着变化，并且在1Hz的低频下，它是最小的。另外，沉积的壁显示出最大的平均微硬度和低频率为3Hz的最大抗拉强度。考虑到沉积的孔隙率和机械优先级，具有3Hz的频率的双脉冲电弧添加剂制造更适合于制造高强度的Al-Mg壁组分而不是在其他低频上。

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