Microstructures and surface performance of laser melting deposited composites on a Ti alloy

Abstract

AbstractThis work is based on the dry sliding wear and cyclic oxidation of composites deposited on a TA1 substrate using laser melting deposition (LMD) technique, the parameters of which are such as to provide almost crack-free composites with minimum dilution and very low porosity. To our knowledge, it is the first time that Stellite SF12-Al-FeSi-B4C mixed powders are deposited as hard composites by LMD technique. Scanning electron microscopy results indicate that such composites with metallurgical joint to a TA1 substrate were formed. It is noted that many nanocrystalline/amorphous phases are also produced, which improve the surface performance of such composites. Compared with the TA1 substrate, improvement of cyclic oxidation and wear resistance are obtained for such composites.