Microstructure, mechanical and wear properties of laser surface melted Ti6Al4V alloy
- 1 April 2014
- journal article
- Published by Elsevier BV in Journal of the Mechanical Behavior of Biomedical Materials
- Vol. 32, 335-344
- https://doi.org/10.1016/j.jmbbm.2013.12.001
Abstract
Laser surface melting (LSM) of Ti6Al4V alloy was carried out with an aim to improve properties such as microstructure and wear for implant applications. The alloy substrate was melted at 250W and 400W at a scan velocity of 5mm/s, with input energy of 42J/mm(2) and 68J/mm(2), respectively. The results showed that equiaxed α+β microstructure of the substrate changes to mixture of acicular α in β matrix after LSM due to high cooling rates in the range of 2.25×10(-3)K/s and 1.41×10(-3)K/s during LSM. Increasing the energy input increased the thickness of remelted region from 779 to 802µm and 1173 to 1199µm. Similarly, as a result of slow cooling rates under present experimental conditions, the grain size of the alloy increased from 4.8μm to 154-199μm. However, the hardness of the Ti6Al4V alloy increased due to LSM melting and resulted in lowest in vitro wear rate of 3.38×10(-4)mm(3)/Nm compared to untreated substrate with a wear rate of 6.82×10(-4)mm(3)/Nm.Keywords
This publication has 45 references indexed in Scilit:
- Laser processed TiN reinforced Ti6Al4V composite coatingsJournal of the Mechanical Behavior of Biomedical Materials, 2011
- Wear performance of laser processed tantalum coatingsMaterials Science and Engineering: C, 2011
- In vitro wear rate and Co ion release of compositionally and structurally graded CoCrMo-Ti6Al4V structuresMaterials Science and Engineering: C, 2011
- Influence of porosity on mechanical properties and in vivo response of Ti6Al4V implantsActa Biomaterialia, 2009
- Surface modification of AISI 410 stainless steel using laser engineered net shaping (LENSTM)Materials & Design (1980-2015), 2009
- Thermal process maps for predicting solidification microstructure in laser fabrication of thin-wall structuresJournal of the American Academy of Dermatology, 2006
- Sensitivity to implant materials in patients undergoing total hip replacementJournal of Biomedical Materials Research Part B: Applied Biomaterials, 2005
- Excimer laser surface treatment of Ti–6Al–4V alloy for corrosion resistance enhancementMaterials Letters, 2001
- Wear resistance of the nitrogen diffusion hardening of the Ti-6Al-4V alloyJournal of Biomechanics, 1998
- Quantitative analysis of bone reactions to relative motions at implant-bone interfacesJournal of Biomechanics, 1993