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Tijo, D.; Masanta, Manoj; Das, Alok Kumar
Surface & coatings technology, 06/2018, Volume: 344Journal Article
In order to improve the surface mechanical performance of Ti-6Al-4V alloy, in-situ TiC-TiB2 composite coating was deposited by tungsten inert gas (TIG) cladding process using Ti and B4C as precursor powder. Based on the available literature, SEM images of the blended precursor powder mixture and coating layer, electron probe micro analysis (EPMA) and corresponding XRD analysis of the produced coating, the formation mechanism of the present TiC-TiB2 composite coating during TIG cladding process was elucidated. The analysis shows that in the coating, TiB2 and TiB phases appeared as hexagonal or rectangular shape, whereas TiC as spherical shape within the matrix of unreacted Ti, Ti-6Al-4V alloy form the substrate and intermetallic phase like TiAl3 formed during the cladding process. The analysis also revealed that the TIG cladding processing current and scan speed have substantial effect on the coating morphology and the phases formed in the coating. •In-situ TiC-TiB2 coating deposited on Ti-6Al-4V alloy by TIG cladding method with Ti and B4C powder.•Formation mechanism of TiC/TiB2 phases was elucidated during the process.•TiB2 and TiB phases formed as hexagonal/rectangular shape and TiC as spherical shape within matrix.•TIG current and scan speed have enormous effect on coating morphology and amount of phases formed.
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