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As-Built EBM and DMLS Ti-6Al-4V Parts: Topography–Corrosion Resistance Relationship in a Simulated Body Fluid
Metals ( IF 2.9 ) Pub Date : 2020-07-28 , DOI: 10.3390/met10081015
Annalisa Acquesta , Tullio Monetta

Machined devices made of titanium or titanium alloys are widely used in biomedical applications. Recently, additive manufacturing technologies (AM) were proposed to reduce the cost of parts and customise their shape. While several researchers have studied the characterisation of the machined surfaces of AM products, less attention has been focused on the study of the surfaces of as-produced parts. The aim of this study was to compare the surface and bulk properties of Ti-6Al-4V alloy products obtained using two types of AM—i.e., electron beam melting and direct metal laser sintering—in comparison to the wrought material and analyse their metallographic, crystallographic, topographic, and electrochemical properties. The metallographic and crystallographic, as well as topographic, analysis showed different microstructures and surface area extensions between the tested specimens. Potentiodynamic polarisation tests highlighted the complex electrochemical behaviour of additively manufactured parts if compared to that of the traditionally fabricated ones. The tests performed on mechanically polished parts underlined similar electrochemical performance between them, even if the additive manufactured ones exhibited a certain instability. Although the as-produced additive manufactured parts present exciting surface shapes, useful in the biomedical field, significant drawbacks remain. A more in-depth study of the device surface modifications, to improve their electrochemical behaviour, is needed.

中文翻译:

竣工时的EBM和DMLS Ti-6Al-4V零件:模拟体液中的形貌与耐蚀性关系

由钛或钛合金制成的机加工设备广泛用于生物医学应用。最近,提出了增材制造技术(AM)以降低零件成本并定制其形状。尽管有几位研究人员研究了AM产品机加工表面的特性,但很少关注研究成品零件的表面。这项研究的目的是与锻造材料比较使用两种类型的AM获得的Ti-6Al-4V合金产品的表面和整体性能(即电子束熔化和直接金属激光烧结),并分析其金相,晶体学,形貌和电化学性质。金相和晶体学以及形貌,分析显示了测试样品之间不同的微观结构和表面积扩展。电位动力极化测试强调了与传统制造零件相比,增材制造零件的复杂电化学行为。在机械抛光零件上进行的测试强调了它们之间相似的电化学性能,即使添加剂制造的零件表现出一定的不稳定性。尽管所生产的增材制造零件具有令人兴奋的表面形状,可用于生物医学领域,但仍存在明显的缺陷。需要对器件表面改性进行更深入的研究,以改善其电化学性能。电位动力学极化测试强调了与传统制造零件相比,增材制造零件的复杂电化学行为。在机械抛光零件上进行的测试强调了它们之间相似的电化学性能,即使添加剂制造的零件表现出一定的不稳定性。尽管所生产的增材制造零件具有令人兴奋的表面形状,可用于生物医学领域,但仍存在明显的缺陷。需要对器件表面改性进行更深入的研究,以改善其电化学性能。电位动力学极化测试强调了与传统制造零件相比,增材制造零件的复杂电化学行为。在机械抛光零件上进行的测试强调了它们之间相似的电化学性能,即使添加剂制造的零件表现出一定的不稳定性。尽管所生产的增材制造零件具有令人兴奋的表面形状,可用于生物医学领域,但仍存在明显的缺陷。需要对器件表面改性进行更深入的研究,以改善其电化学性能。即使添加剂制造的产品表现出一定的不稳定性。尽管所生产的增材制造零件具有令人兴奋的表面形状,可用于生物医学领域,但仍存在明显的缺陷。需要对器件表面改性进行更深入的研究,以改善其电化学性能。即使添加剂制造的产品表现出一定的不稳定性。尽管所生产的增材制造零件具有令人兴奋的表面形状,可用于生物医学领域,但仍存在明显的缺陷。需要对器件表面改性进行更深入的研究,以改善其电化学性能。
更新日期:2020-07-28
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