Interfacial microstructure and mechanical behaviour in laser clad TiC p /Ni alloy coatings

Abstract

Coatings of TiC_p reinforced composite have been produced by laser cladding. Two kinds of coating with different TiC_p origins were investigated, i.e. undissolved TiC_p and in situ TiC_p. For undissolved TiC_p, epitaxial growth of TiC, precipitation of CrB, and a chemical reaction occur at phase interfaces, and nanoindentation loading curves show pop in marks caused by the plastic deformation associated with crack formation or debonding of TiC_p from the matrix. As for in situ TiC_p, no pop in mark appears. Meanwhile, in situ TiC_p produces hardness and elastic modulus values that are higher than those produced by the coating that contains undissolved TiC_p.