scholarly journals As-Built EBM and DMLS Ti-6Al-4V Parts: Topography–Corrosion Resistance Relationship in a Simulated Body Fluid

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1015 ◽  
Author(s):  
Annalisa Acquesta ◽  
Tullio Monetta
Keyword(s):  
Electron Beam Melting ◽  
Biomedical Applications ◽  
Electrochemical Behaviour ◽  
Surface Modifications ◽  
Direct Metal Laser Sintering ◽  
Topographic Analysis ◽  
Bulk Properties ◽  
Depth Study ◽  
Manufacturing Technologies ◽  
The Cost

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.

scholarly journals Epoxy/alumina composite coating on welded steel 316L with excellent wear and anticorrosion properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maryama Hammi ◽  
Younes Ziat ◽  
Zakaryaa Zarhri ◽  
Charaf Laghlimi ◽  
Abdelaziz Moutcine
Keyword(s):  
Electrochemical Behaviour ◽  
Sem Analysis ◽  
Water Contact ◽  
Welded Steel ◽  
Melted Zone ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Alumina Composite ◽  
The Cost ◽  
Good Contrast

AbstractThe main purpose of this study is to elaborate anticorrosive coatings for the welded steel 316L, since this later is widely used in industrial field. Hence, within this work we have studied the electrochemical behaviour of different zones of the welded steel 316 in 1 M HCl media. The macrography study of the welded steel has revealed the different areas with a good contrast. We have stated three different zones, namely; melted zone (MZ), heat affected zone (HAZ) and base metal zone (BM). Impedance studies on welded steel 316L were conducted in 1 M HCl solution, coating of Epoxy/Alumina composite was applied on different zones, in order to reveal the anti-corrosion efficiency in each zone. Scanning electron microscopy (SEM) analysis was undertaken in order to check how far the used coating in such aggressive media protects the studied zones and these findings were assessed by water contact angle measurements. The choice of this coating is based on the cost and the safety. We concluded that the Epoxy/Alumina composite has a good protecting effect regarding welded steel in aggressive media.

Effect of surface modifications of additively manufactured Ti-6Al-4V alloys on apatite formation ability for biomedical applications

2021 ◽  
pp. 161445
Author(s):  
Selim Demirci ◽  
Ramazan Dalmış ◽  
Tuncay Dikici ◽  
Mehmet Masum Tünçay ◽  
Nusret Kaya ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Surface Modifications ◽  
Apatite Formation ◽  
Effect Of Surface

scholarly journals Surface Structuring via Additive Manufacturing to Improve the Performance of Metal and Polymer Joints

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 567
Author(s):  
Xin Zou ◽  
Lifu Huang ◽  
Ke Chen ◽  
Muyang Jiang ◽  
Shanyong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam Melting ◽  
Biomedical Applications ◽  
Surface Structures ◽  
Joint Performance ◽  
Ti6al4v Titanium Alloy ◽  
Promising Strategy ◽  
Surface Structuring ◽  
Ultra High Molecular Weight ◽  
Metal Polymer

In order to enhance the joint performance of Ti6Al4V titanium alloy (TC4) and ultra-high molecular weight polyethylene (UHMWPE) for biomedical applications, different structures were fabricated on TC4 surfaces via electron beam melting (EBM) method in this study. Macromorphologies and microinterfaces of TC4–UHMWPE joints produced via hot pressing technique were carefully characterized and analyzed. The effects of different surface structures on mechanical properties and fractured surfaces were investigated and compared. Strong direct bonding (1751 N) between UHMWPE and TC4 was achieved. The interfacial bonding behavior of TC4–UHMWPE joints was further discussed. This study demonstrates the importance of combining macro- and micromechanical interlocking, which is a promising strategy for improving metal–polymer joint performance. It also provides guidance for metal surface structuring from both theoretical and practical perspectives.

Modern biomaterials: a review—bulk properties and implications of surface modifications

2007 ◽  
Vol 18 (7) ◽  
pp. 1263-1277 ◽  
Author(s):  
Paul Roach ◽  
David Eglin ◽  
Kirsty Rohde ◽  
Carole C. Perry
Keyword(s):  
Surface Modifications ◽  
Bulk Properties

Functionalization of pure titanium MAO coatings by surface modifications for biomedical applications

2020 ◽  
Vol 394 ◽  
pp. 125812 ◽  
Author(s):  
Shu-Chuan Liao ◽  
Chia-Ti Chang ◽  
Chih-Ying Chen ◽  
Cheng-Hung Lee ◽  
Win-Li Lin
Keyword(s):  
Biomedical Applications ◽  
Pure Titanium ◽  
Surface Modifications

Investigation on the Effect of Process Parameters on Hardness of Components Produced by Direct Metal Laser Sintering (DMLS)

2012 ◽  
Vol 488-489 ◽  
pp. 1414-1418 ◽  
Author(s):  
C.D. Naiju ◽  
K. Annamalai ◽  
P.K. Manoj ◽  
K.M. Ayaz
Keyword(s):  
Process Parameters ◽  
Statistical Design ◽  
Laser Sintering ◽  
Optimum Process ◽  
Direct Metal Laser Sintering ◽  
Significant Extent ◽  
Statistical Design Of Experiments ◽  
Layer Manufacturing ◽  
Manufacturing Technologies ◽  
Hatch Spacing

Direct metal laser sintering (DMLS) is one of the methods in layer manufacturing technologies by which metal powder can be directly used to produce both prototype and production tools. The components manufactured by DMLS should have essential hardness for its application in the industry. This study was carried out to determine the optimum process parameters influencing the hardness of the components produced by DMLS. Sintering speed, hatch spacing, post contouring, infiltration and hatch type are the process parameters taken up for study. Statistical design of experiments using Taguchi’s orthogonal array was employed for this study. The experimental data obtained were analyzed using ANOVA. From the results, it is found that one of the process parameters; scan spacing affects the hardness of the parts produced by this technology to a significant extent.

Electrochemical behaviour of passive film formed on the surface of Ti-6Al-4V alloys fabricated by electron beam melting

2018 ◽  
Vol 145 ◽  
pp. 80-89 ◽  
Author(s):  
Xin Gai ◽  
Yun Bai ◽  
Ji Li ◽  
Shujun Li ◽  
Wentao Hou ◽  
...  
Keyword(s):  
Electron Beam ◽  
Passive Film ◽  
Electron Beam Melting ◽  
Electrochemical Behaviour

scholarly journals Surface Modifications and Functionalization of Materials for Biomedical Applications

2010 ◽  
Vol 252 ◽  
pp. 011001 ◽  
Author(s):  
Jose Luis Endrino ◽  
Jose A Puértolas ◽  
Jose M Albella
Keyword(s):  
Biomedical Applications ◽  
Surface Modifications

Microstructure and Tensile Strength of Rapid Manufacturing Parts

2014 ◽  
Vol 903 ◽  
pp. 114-117 ◽  
Author(s):  
Izhar Abd Aziz ◽  
Brian Gabbitas ◽  
Mark Stanford
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Biomedical Applications ◽  
Bulk Material ◽  
Solidification Rate ◽  
Laser Sintering ◽  
Liquid Pool ◽  
Sintering Process ◽  
Direct Metal Laser Sintering ◽  
Production Route

The purpose of this work is to investigate the microstructure and tensile strength of Ti6Al4V pre-alloyed powders produced by a direct metal laser sintering technique. Traditionally, Ti6Al4V products for biomedical applications were produced through hot working or machining of wrought semi-finished products. A change in the production route for manufacturing Ti6Al4V products, from the more traditional methods to an additive manufacturing route, requires an investigation of microstructure and mechanical properties because these are strongly influenced by the production route. The microstructure obtained through rapid solidification during laser sintering shows a very fine α+β lamellar morphology. There is also evidence of martensite which was expected due to high solidification rate of the liquid pool from a temperature above the β-transus during the laser sintering process. Structurally, good mechanical properties which are comparable to the bulk material were obtained.

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