Laser Treatment of Titanium Alloys
GIRZHON V.V.$^1$, SMOLYAKOV O.V.$^1$, GRESHTA V.L.$^1$, YEMELIANCHENKO V.V.$^1$, and RAZZOKOV A.Sh.$^2$
$^1$National University ‘Zaporizhzhia Polytechnic’, 64 Zhukovsky Str., UA-69063 Zaporizhzhia, Ukraine
$^2$Urgench State University, 14 Khamid Alimzhan Str., UZ-220100 Urgench City, Uzbekistan
Received 22.04.2024, final version 02.11.2024 Download PDF
Abstract
The structural and phase states of surface layers of the titanium VT1-0, VT3-1, VT-6 and VT-8 alloys after laser treatment in various gas environments, VT25-U alloy after twist extrusion and subsequent laser treatment, and VT1-0 alloy after laser alloying with powders of pure elements Fe, Co, Ni are investigated. As shown, the mentioned types of treatments lead to an increase in the surface-layers’ microhardness values. The influence of the surrounding gas atmosphere and the titanium-alloy chemical composition on the structure-formation processes during their laser melting and on the microhardness value of the treated layers is analysed. The effect of laser treatment of the surface of sintered single-phase powder titanium VT1-0-type alloys on the porosity level in the melting zone is investigated. As established, the microhardness in the laser-melting zone of the VT25U alloy exceeds the samples’ microhardness after heat treatments and twist extrusion. Therefore, the presented laser surface-treatment modes act as an effective method of titanium-alloy surface treatment, since they have a qualitative effect on structure that, in turn, leads to an improvement in the mechanical characteristics of the surface layers.
Keywords: laser treatment, laser alloying, melting zone, martensitic transformation, microhardness, phase composition.
DOI: https://doi.org/10.15407/ufm.25.04.787
Citation: V.V. Girzhon, O.V. Smolyakov, V.L. Greshta, V.V. Yemelianchenko, and A.Sh. Razzokov, Laser Treatment of Titanium Alloys, 25, No. 4: 787–821 (2024)