Electropolishing and electropolishing-related allowances for powder bed selectively laser-melted Ti-6Al-4V alloy components

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• 作者：V. Urlea ; V. Brailovski<sup> ; sup><sup>v.brailov@gmail.comsup><sup> ; sup><sup>vladimir.brailovski@etsmtl.casup>
• 关键词：Additive manufacturing ; Selective laser melting ; Build orientation ; Surface finish ; Electropolishing allowances ; Ti-6Al-4V
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：242
• 期：Complete
• 页码：1-11
• 全文大小：3797 K
• 卷排序：242

文摘

This study allowed the current density optimization for the efficient electropolishing of Ti-6Al-4V test coupons containing multiple surfaces, which were oriented with respect to the building platform under angles varying from 0 to 135°. It was shown that despite a large scatter in the as-built surface finish, ranging from Ra&#xA0;= 4 μm (0°) to Ra = 23 μm (135°), all the differently-oriented surfaces were polished down to a uniform roughness of Ra = 1&ndash;3 μm. This means that the higher the as-built surface roughness, the larger the quantity of the material needed to be removed during electropolishing in order to reach a uniform level of surface finish. Finally, thickness evolution measurements during finishing of the differently-oriented test coupons allowed us to establish the build orientation-dependent allowances for the electropolishing of selectively laser-melted Ti-6Al-4V parts.