Investigation on the wear properties of Ti/TiC/TiN composite coatings prepared by powder cored wires through TIG method at nitrogen atmosphere on titanium substrate

Abstract

In this present study, Tungsten Inert Gas (TIG) welding and powder filled cored wires with nitrogen shielding gas were utilized to produce TiC and TiN surface composite coatings on the titanium (Ti) sheet substrate. The TIG procedure was done at same welding parameters for all of prepared samples. Phase analysis and microstructures were done by X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The obtained results from XRD and EDS demonstrated that the presence of crystalline phases of TiC, TiN and Ti. SEM and OM exhibited formation of the spherical and dendritic TiC particles in a martensitic matrix and also, TiN pinhole areas with rough and collapsed arms. Maximum microhardness value obtained was 571 HV in the case of sample treated with TiC cored wire at 95%argon+5% nitrogen atmosphere. The Pin-on-disk wear tests showed that the coating with maximum hardness had a higher wear resistance due to the presence of fine and hard TiC particles in the high-impact toughness titanium alloy with uniform distribution.