Evaluation of Mechanical Properties of Ti6Al4V Built by Composite Coating of WS2, CNT, Ni, and Ti6Al4V Powders Through Laser Cladding Process

Abstract

Titanium and its alloy have wide application in the field of aerospace and marine engineering. But due to it’s poor tribological and weight to strength ratio make difficult to use in the critical working environment. To overcome this drawback a composite cladding of WS2, CNT, and Ni was formed on the Ti6Al4V substrate. In the present work select the process parameter at constant scanning speed (450 mm/min), laser power (125–250 W). The variations of layer thickness microhardness with respect to the input parameter have been analyzed and it was observed that laser power is the influential parameter to the output measure. Hence the maximum microhardness was found to be 1246 HV.5 kg which is approximately three times more than that of the substrate material. Further characterization has been done for the morphological analysis which shows that strong bonding have been formed to the interface zone and there is no crack found but at a higher percentage of CNT some microcrack are observed. With the increase in WS2, wear resistance have been improved significantly in comparison to the substrate. XRD analysis observed that there are a number of a compounds like W2C, WS2, TiC, Ti2S, NiS2, and Al4C3 was formed which improve the mechanical properties of the substrate titanium alloy.