Pure commercial titanium is widely used because of its high corrosion resistance and lower cost compared with other
titanium alloys, in particular when there is no high wear requirements. Nevertheless, the wear resistance is poor and
surface damage occurs in areas under contact loadings. Laser melting deposition using a high power laser is a suitable
technique for manufacturing precise and defect free coatings of a dissimilar material with higher wear and corrosion
resistance. In this work a good understanding of laser metal deposition mechanisms allowed to obtain defect free
coatings of Ti6Al4V and TiC metal matrix composite (MMC) using a flash lamp pumped Nd:YAG laser of 1 kW. A
complete investigation of the process parameters is discussed and resultant wear and corrosion properties are shown. The
results show the feasibility to apply the process for manufacturing, improving or repairing high added value components
for a wide range of industrial sectors.
Laser metal deposition (LMD) with high power lasers consists of manufacturing precise layers of materials by fusing
metal powder with a laser beam over a substrate. Typical dilution of 5% allows metallurgical adhesion of the coating.
This technique provides a unique combination of high accuracy and low heat affecting zone which is attractive for
processing high added value components such aeroengines. Nickel (Ni) base superalloys are widely used in aeroengines
because of their high mechanical properties when working at high temperatures (creep). A repairing or manufacturing
chain of these components by LMD requires a good understanding of many parameters; therefore process control plays
an important role. This work is focused on the study of the LMD processing of a Ni base superalloy using two colour
pyrometry for the process monitoring. Presented results show how temperature and cooling rates of the LMD tracks
affect the shape, microstructure and corrosion of the LMD coatings.
This study explores the potential ability of laser metal deposition (LMD) as metal foaming process, considering that its
intrinsic high heating/cooling rates can avoid some of the common problems of gas leakage, in-homogeneity and
anisotropy that arise when manufacturing metallic foams by conventional powder metallurgy (PM) methods. Highly
porous coatings of aluminum and titanium alloys have been obtained by this PM-LMD metal foaming method.