Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 53, Issue -, Pages 239-249Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2015.08.013
Keywords
Laser processing; Ti nitride; Wear resistance; Hard coatings; Surface modification
Funding
- Joint Center for Aerospace Technological Innovation (JCATI), WA
- W. M. Keck Foundation
- M. J. Murdock Charitable Trust
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Laser remelting of commercially pure titanium (CP-Ti) surface was done in a nitrogen rich inert atmosphere to form in situ TiN/Ti composite coating. Laser surface remelting was performed at two different laser powers of 425 W and 475W. At each power, samples were fabricated with one or two laser scans. The resultant material was a nitride rich in situ coating that was created on the surface. The cross sections revealed a graded microstructure. There was presence of nitride rich dendrites dispersed in alpha-Ti matrix at the uppermost region. The structure gradually changed with lesser dendrites and more heat affected alpha-Ti phase maintaining a smooth interface. With increasing laser power, the dendrites appeared to be larger in size. Samples with two laser scans showed discontinuous dendrites and more alpha-Ti phase as compared to the samples with one laser scan. The resultant composite of TiN along with Ti2N in alpha-Ti showed substantially higher hardness and wear resistance than the untreated CP-Ti substrate. Coefficient of friction was also found to reduce due to surface nitridation. Leaching of Ti4+ ions during wear test in DI water medium was found to reduce due to laser surface nitriding. (C) 2015 Elsevier Ltd. All rights reserved.
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