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A detailed study of the microstructure formed during laser nitriding of Ti-6Al-4V under different gas atmospheres

: Kaspar, J.; Luft, A.; Bonß, S.; Winderlich, B.; Brenner, B.

Lütjering, G. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel:
Ti-2003. Science and technology. Vol.2 : Proceedings of the 10th World conference on Titanium, held at the CCH-Congress Center Hamburg, Germany, 13 - 18 July 2003
Weinheim: Wiley-VCH, 2004
ISBN: 3-527-30306-5
World Conference on Titanium <10, 2003, Hamburg>
Fraunhofer IWS ()

The various microstructures formed in the Ti-6Al-4V alloy during laser nitriding in dependence on the nitrogen content of the gas atmosphere were studied in detail by means of optical microscopy, electron microscopy (SEM, TEM) and energy dispersive X-ray spectroscopy (EDX). The study revealed new results on the microstructural and compositional state of both the metallic matrix and the various TiN x-phases formed during the solidification of the melt and by solid state reactions. The nitrogen content of the gas atmosphere was found to be a key processing parameter by which the structure and hence the properties of the laser nitrided layers can be controlled in a wide range.