MICROSTRUCTURE AND MECHANICAL PROPERTIES OF STELLITE 6 ALLOY POWDERS INCORPORATED WITH Ti/B4C USING PLASMA-ARC-SURFACING PROCESSES

摘要

Composite powders including Ti, B4C and Stellite 6 were deposited on the 316 stainless steel using plasma-transferred arc welding to improve the wear resistance. Microstructural characterisation using an optical microscope and a Vickers hardness tester was performed on the surface to determine the coating and hardness. Scanning electron microscopy and energy-dispersive-spectroscopy line scanning were also applied to characterise the microstructure, the chemical composition and the process of wear. Results showed that Ti. B4C and Stellite 6 considerably affected the microstructure and morphology of the coating. The in-situ new phases. namely, TiC and TiB, remarkably improved the wear resistance compared with the Stellite 6 coating only.