Ti-SiC Composite and TiC Ceramic Layer Formation of Ti6Al4V Surface by Laser Alloying of Pre-Placed SiC Coating

摘要

The Ti-6Al-4V alloy pre-placed with SiC coatingwas laser alloyed using high power CO2 laser. The laser alloyedcross section shows dendrite and Ti-SiC composite layermicrostructure and the respective hardness was 650-800 HV and1500-2000 HV. The observed hardness was 2 to 7 times greaterthan that measured on the bulk Ti-6Al-4V substrate. The laseralloyed surface produced high temperature ceramic phases such asTiC, TiSi and Ti5Si3. The elemental analysis was qualitativelyestimated using SIMS analysis.