MICROSTRUCTURE AND WEAR RESISTANCE OF LASER CLAD Cr₃Si / Cr₂Ni₃Si COMPOSITE COATING

A novel rapidly solidified Cr₃Si / Cr₂Ni₃Si composite coating is fabricated on the substrate of a 0.20 % C low carbon steel by laser cladding using Cr-Si-Ni elemental powder blends. The laser clad coating has a homogeneous microstructure consisting of Cr₃Si primary dendrites uniformly distributed in the Cr₂Ni₃Si complex silicide matrix and is metallurgically bonded to the substrate. The laser clad Cr₃Si reinforced Cr₂Ni₃Si silicide matrix composite coating has good wear resistance under dry sliding wear test condition and pin-on-disk abrasive wear test condition.