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Liquid Phase Surface Treatment of Ti-6Al-4V Titanium Alloy by Pulsed Nd:YAG Laser

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Abstract

In this paper, liquid phase surface engineering of Ti-6Al-4V titanium alloy using a 400 W average power-pulsed mode Nd:YAG laser has been studied. Optimized parameters of the laser treatment were determined based on the quality and properties of the fabricated surface layers. Optical microscope and scanning electron microscope equipped with EDS analyzer were used to investigate the microstructural and geometrical features of the laser-treated surfaces. In addition, x-ray diffraction method was also applied for phase analysis of the treated layers. The microstructures of the melted zones were mainly consisted of α′ martensite together with Ti3Al intermetallics where α′ martensite had hexagonal structure with acicular morphology. α′ martensite transformed to fine α + β structure after tempering at 480 °C for 7 h. Microhardness measurements showed approximately two-fold increases in hardness after surface melting (600-630 HV0.2) compared to that of the parent metal (300-350 HV0.2).

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Authors and Affiliations

  1. School of Metallurgy and Materials, College of Engineering, University of Tehran, P.O.Box 11155-4563, Tehran, Iran

    Hassan Ghorbani, Mahmoud Heydarzadeh Sohi & Babak Mehrjou

  2. Iranian National Center for Laser Science and Technology, P.O. Box 14665-576, Tehran, Iran

    Mohammad Javad Torkamany

Authors
  1. Hassan Ghorbani
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  2. Mahmoud Heydarzadeh Sohi
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  3. Mohammad Javad Torkamany
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  4. Babak Mehrjou
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Correspondence to Hassan Ghorbani.

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Ghorbani, H., Heydarzadeh Sohi, M., Torkamany, M.J. et al. Liquid Phase Surface Treatment of Ti-6Al-4V Titanium Alloy by Pulsed Nd:YAG Laser. J. of Materi Eng and Perform 24, 3634–3642 (2015). https://doi.org/10.1007/s11665-015-1615-x

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  • DOI: https://doi.org/10.1007/s11665-015-1615-x

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