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Wear behavior of Ti6Al4V biomedical alloys processed by selective laser melting, hot pressing and conventional casting

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Transactions of Nonferrous metals Society of China 2017年第4期27卷 829-838页

作者： F.BARTOLOmEU m.buciumeanu E.PINTO N.ALVES F.S.SILVA O.CARVALHO G.mIRANDA Center for micro-Electro mechanical Systems (CmEmS-Uminho) University of Minho Azurem 4800-058 Guimaraes Portugal Cross-Border Faculty of Humanities Economics and Engineering"Dunarea de Jos" University of Galati Domneasca 47 800008 Galati Romania Centre for Rapid and Sustainable Product Development Polytechnic Institute of Leiria Rua General Norton de Matos Apartado 4133 2411-901 Leiria Portugal

The aim of this work was to study the influence of the processing route on the microstructural constituents,hardness andtribological(wear and friction)behavior of Ti6Al4V biomedical *** this sense,three different processing routes were studied:conventional casting,hot pressing and selective laser melting.A comprehensive metallurgical,mechanical and tribologicalcharacterization was performed by X-ray diffraction analysis,Vickers hardness tests and reciprocating ball-on-plate wear tests ofTi6Al4V/Al2O3sliding *** results showed a great influence of the processing route on the microstructural constituents andconsequent differences on hardness and wear *** highest hardness and wear resistance were obtained for Ti6Al4Valloy produced by selective laser melting,due to a markedly different cooling rate that leads to significantly different microstructurewhen compared to hot pressing and *** study assesses and confirms that selective laser melting is potential to producecustomized Ti6Al4V implants with improved wear performance.

关键词： biomedical alloy Ti6Al4V alloy wear behavior microstructure selective laser melting hot pressing casting

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Fatigue Behaviour of Naval Steel Under Seawater Environmental and Variable Loading Conditions

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Journal of Iron and Steel Research International 2011年第5期18卷 64-69页

作者： C Gheorghies L Palaghian S Baicean m.buciumeanu S Ciortan Department of Physics University "Dunarea de Jos" of Galati Department ofmechanical Engineering University "Dunarea de Jos" of Galati

The way to characterize the behaviour of a naval steel grade E36 subjected to the corrosive fatigue process is investigated. The tests were carried out by bending fatigue of plate specimens with thickness of 10 mm in the corrosive environment consisting of an aqueous solution of 3.5% of NaCl which is similar to seawater. Experimental results show that the principal mechanism of degradation of the superficial layer is based on the pit evolution,evidenced by electrochemical,micro and macro structural timely changes such as evolution of electrode potential,evolution of current density,polarization resistance,anodic and cathodic parameters,and dislocation density evolution.

关键词： naval steel fatigue pitting corrosion structure

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