Deposition of Co–Ti alloy on mild steel substrate using laser cladding

✍ Scribed by Hamidreza Alemohammad; Shahrzad Esmaeili; Ehsan Toyserkani

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 975 KB
• Volume: 456
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.12.054

✦ Synopsis

Laser cladding of a Co-Ti alloy on a mild steel substrate is studied. Premixed powders with the composition of 85 wt% cobalt and 15 wt% titanium are pre-placed on the substrate and a moving laser beam at different velocities is used to produce clad layers well bounded to the substrate. Characteristics of the clad are investigated using optical microscopy, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and microhardness tests. The results reveal that the intermetallic phase TiCo 3 and ␤ (i.e. fcc) cobalt are formed in the clad layer. The clad layer can also have major dilution from the substrate depending on the laser scanning velocity. It is observed that a finer microstructure is achievable with higher laser velocities whereas higher hardness is achieved using lower velocities. The latter is due to the formation of a larger fraction of TiCo 3 phase.