Improvement of Surface Properties of Ti64 Alloy in the Presence of ZrO2 Nano-Particles by Using of Tungsten Inert Gas Welding
In this research, coating of ZrO2 nano-particles with different thicknesses on the surface of Ti-6Al-4V sheet was used for surface melting using by TIG welding process and without filler metal. After the melting operation in the presence of zirconia nanoparticles, the depth of the melting surface and hardness was measured. Also, using of optical microscope and SEM microscope, the microstructure of the different melting surface areas was investigated. To defined the presence of nanoparticles in the melted area, chemical analysis of EDS and X-ray diffraction pattern (XRD) have been carried out to identify the phases formed in the samples from melting operations. Nano particles penetrate deeply from the melt surface, resulting in a acicular structure that is interlocked. The causes of the formation of this structure is the presence of nanoparticles during surface melting operations And the formation of nucleation centers to create appropriate buds in suitable places. The applied nanoparticles on the surface with the surface tension shift gradient mechanism have increased the depth of the penetration of the melt surface. The most important effect of nanoparticles on the surface was hardness. The hardness result is in the sample, which has the highest nanoparticles. The hardness of these samples is 2.5 times higher than the base metal. With the constant consideration of welding parameters and increasing the ZrO2 nanoparticles, the depth of the melting area and the hardness of the melting region increased compared to the base metal.
Article Type:
Research/Original Article
Iranian Journal of Surface Science and Engineering, No. 33, 2017
89 - 100  
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