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Laser Gas Nitriding of Ti-6Al-4V Part 2: Characteristics of Nitrided Layers

Laser Gas Nitriding of Ti-6Al-4V Part 2: Characteristics of Nitrided Layers The characteristics of laser nitrided layers formed on Ti-6Al-4V are presented in this investigation. It has been determined that titanium nitride (TiN) is formed, which significantly increases the hardness of the nitrided surfaces. The amount of titanium nitride produced depends on the processing parameters such as laser pulse energy and nitrogen concentration. Nitrided layers are much smoother along the laser pass direction than perpendicular to this direction. The shrinkage effect in the laser melt zone produces surface residual tensile stresses in Ti-6Al-4V samples regardless of whether the processing environment is Ar, N2, or a mixture of these gases. Pre-heating or stress relieving after laser nitriding significantly reduces the residual tensile stress level. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Performance Materials Springer Journals

Laser Gas Nitriding of Ti-6Al-4V Part 2: Characteristics of Nitrided Layers

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Publisher
Springer Journals
Copyright
Copyright © 1997 by Kluwer Academic Publishers
Subject
Engineering; Automotive Engineering; Characterization and Evaluation of Materials; Classical Mechanics; Metallic Materials
ISSN
0929-1881
eISSN
1572-8765
DOI
10.1023/A:1008696511669
Publisher site
See Article on Publisher Site

Abstract

The characteristics of laser nitrided layers formed on Ti-6Al-4V are presented in this investigation. It has been determined that titanium nitride (TiN) is formed, which significantly increases the hardness of the nitrided surfaces. The amount of titanium nitride produced depends on the processing parameters such as laser pulse energy and nitrogen concentration. Nitrided layers are much smoother along the laser pass direction than perpendicular to this direction. The shrinkage effect in the laser melt zone produces surface residual tensile stresses in Ti-6Al-4V samples regardless of whether the processing environment is Ar, N2, or a mixture of these gases. Pre-heating or stress relieving after laser nitriding significantly reduces the residual tensile stress level.

Journal

Advanced Performance Materials – Springer Journals

Published: Sep 28, 2004

References

  • Laser nitriding and carburizing of Ti-6Al-4V titanium alloy
    Collin, M.; Coquerelle, G.
  • Laser surface alloying of titanium substrates with carbon and nitrogen
    Walker, A.; Folkes, J.; Steen, W.M.; West, D.R.F.
  • The effect of laser surface treatments on the tribological behaviour of Ti-6Al-4V
    Yerramareddy, S.; Bahadur, S.
  • Laser gas nitriding of Ti-6Al-4V, Part 1: Optimization of the process
    Xue, L.; Islam, M.; Koul, A.K.; Bibby, M.; Wallace, W.
  • Wrought titanium and titanium alloys
    Lampman, S.
  • Laser surface hardening of AISI 01 tool steel and its microstructure
    Bande, H.; L'Espérance, G.; Islam, M.U.; Koul, A.K.
  • Mechanical testing of thin films
    Brotzen, F.R.