Abstract
Abstract A coating of pure titanium without defects was successfully prepared on the surface of Ti-6Al-4V substrate by pulsed laser cladding. The characteristics and performance of the coating and the substrate including microstructure, phase constitution and hardness were probed by combined use of multiple characterization methods. Results show that fine lamellar grains are formed in the coating during the ultrafast non-equilibrium solidification process induced by pulsed laser cladding. The average size of these grains is about 0.79 μm. The hardness test shows that the hardness of the coating is 433.82 HV, 30.4% higher than that of the Ti-6Al-4V substrate. Besides, a lower wear volume compared to the substrate is found for the coating which indicates greatly improved wear resistance. In-depth analyses suggest that the improved surface performance can be mainly attributed to grain refinement strengthening in the cladding zone.
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