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Titanium Matrix Composite Ti/TiN Produced by Diode Laser Gas Nitriding

Welding Department, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
Academic Editor: M. T. Whittaker
Metals 2015, 5(1), 54-69;
Received: 11 November 2014 / Accepted: 4 January 2015 / Published: 9 January 2015
(This article belongs to the Special Issue Titanium Alloys)
PDF [3082 KB, uploaded 9 January 2015]


A high power direct diode laser, emitting in the range of near infrared radiation at wavelength 808–940 nm, was applied to produce a titanium matrix composite on a surface layer of titanium alloy Ti6Al4V by laser surface gas nitriding. The nitrided surface layers were produced as single stringer beads at different heat inputs, different scanning speeds, and different powers of laser beam. The influence of laser nitriding parameters on the quality, shape, and morphology of the surface layers was investigated. It was found that the nitrided surface layers consist of titanium nitride precipitations mainly in the form of dendrites embedded in the titanium alloy matrix. The titanium nitrides are produced as a result of the reaction between molten Ti and gaseous nitrogen. Solidification and subsequent growth of the TiN dendrites takes place to a large extent at the interface of the molten Ti and the nitrogen gas atmosphere. The direction of TiN dendrites growth is perpendicular to the surface of molten Ti. The roughness of the surface layers depends strongly on the heat input of laser nitriding and can be precisely controlled. In spite of high microhardness up to 2400 HV0.2, the surface layers are crack free. View Full-Text
Keywords: titanium; titanium nitrides; composite; laser gas nitriding; laser surface treatment titanium; titanium nitrides; composite; laser gas nitriding; laser surface treatment

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Lisiecki, A. Titanium Matrix Composite Ti/TiN Produced by Diode Laser Gas Nitriding. Metals 2015, 5, 54-69.

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