Abstract
Titanium alloy has extensive applications in numerous fields, such as in aerospace, shipbuilding, petrochemical, and bio-medical. However, under the condition of high temperature (above 700 °C), it is difficult to meet the requirements of the performance of the turbine blades, piston rings, valves, etc. In this paper, the alloy powder is composed of Ni60A, TiN, Al, and Si in accordance with the proportion of 1:3:4:2 (mass ratio), and the composite coating, such as TiN, TiB, Ti5Si3, and Al3Ti were synthesized on Ti-6Al-4V alloy by Yttrium Aluminium Garnet(YAG) laser. The friction and wear experiments were carried out on Ti-6Al-4V alloy and alloyed coatings at different loads (3N, 6N, 9N), and different temperatures (25 °C, 350 °C, 700 °C). The impact of load and temperature on wear performance were analyzed by analyzing the friction traces. The results showed that the abrasion loss, wear width, and depth, wear volume, and wear ratio of the alloyed coatings were less than Ti-6Al-4V alloy, and the surface of furrow was shallow and the wear was less. However, under high temperature conditions, the alloy coating wears worse than Ti-6Al-4V alloy, and the high temperature wear resistance is not ideal.
Highlights
With the development of technology and the requirements of deep space and deep-sea exploration, it is extremely important for equipment and structural parts to be stable, to serve under severe conditions, such as high stress, strong corrosion, and high temperature
Nair et al [13] synthesized TiCN coating in situ on Tie6Ale4V matrix by laser surface alloying, and the results showed that the dendritic structure of TiCN increased the hardness of the coating, and its corrosion resistance was significantly improved due to the alloying of Ti-6Al-4V matrix and TiCN
It can be seen that the wear resistance ability of alloying coating at room temperature is better than Ti-6Al-4V alloy, but worse at high temperatures
Summary
With the development of technology and the requirements of deep space and deep-sea exploration, it is extremely important for equipment and structural parts to be stable, to serve under severe conditions, such as high stress, strong corrosion, and high temperature. Improving the wear resistance of the titanium alloy is of great significance for broadening its application range in parts and components requiring high performance materials. Laser surface alloying is a method of local modification of metal surface It aims to change the composition, phase, and microstructure of the material surface, and change the performance of the material surface, to meet the performance requirements of wear resistance, corrosion resistance, and oxidation resistance. The tribological properties of the composite coating and Ti-6Al-4V under different loads and temperatures were compared, and the mechanism of different wear results was analyzed This has certain guiding significance for improving the wear resistance and high temperature resistance of the titanium alloy Ti-6Al-4V under harsh conditions, such as high temperature
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