Microstructure and property of composite coatings on titanium alloy deposited by laser cladding with Co42+TiN mixed powders

Effect of Mo on Microstructures and Wear Properties of In Situ Synthesized Ti(C,N)/Ni-Based Composite Coatings by Laser Cladding

“…Besides this, Cr 2 B and Cr 7 C 3 are also detected in the 0Mo coating owing to the reactions between Cr and B, C [ 13 ]. It has been noted that the 4Mo and 8Mo coatings contains not only all of the above phases, but also a new phase MoC, which is derived from the reaction between Mo and C. Meanwhile, the diffraction peak of MoC is higher in 8Mo coating than that of 4Mo coating, which is coincides with the increasing Mo content.…”

“…In addition, crystals in planar and cellular morphologies appear near the bonding line because of the ultra-high thermal gradient, as shown in Figure 2 b. Due to the rapid melting and rapid solidification caused by laser cladding, acicular martensites ( ) [ 13 ] emerge in the substrate near the bonding line, which is regarded as heat-affected zone.…”

“…On the one hand, Mo can decrease the solubility of TiN or Ti(C,N) in the Ni matrix, and more small TiN particles are remained [ 23 , 24 ]. On the basis of the heterogeneous nucleation theory, the grain crystals tend to attach themselves on the already existed phases in order to reduce the energy for their growth [ 13 ]. In this case, the undissolved TiN will act as the nucleation site for the grain growth, so the grain is refined due to the increased number of crystal nuclei.…”

“…Self-fluxing alloy (Fe-based, Ni-based, Co-based alloys, etc.) powders have been used as laser cladding materials in virtue of the characteristics of low melting point and good wettability [ 13 ]. Moreover, previous investigations indicated that the composite materials composed of self-fluxing alloy powders and hard ceramic particles can fabricate coatings with a better microstructure and better mechanical properties [ 14 , 15 , 16 ].…”

The Microstructure and Wear Resistance of a Copper Matrix Composite Layer on Copper via Nitrogen-Shielded Arc Cladding

“…TiN particles are one of most common reinforced particles that are used to enhance the surface property of metals, as it has a high melting point and hardness, perfect ductility, wear resistance, and electric conductivity [16][17][18]. Some researchers have used laser cladding to prepare a TiN/Ti 3 Al particle-reinforced composite on a titanium alloy surface [19,20]; some researchers have used arc cladding and powder made of Ti, BN, and Ni to prepare a TiN-reinforced nickel matrix composite on the surface of 16Mn steel [21]; other researchers have used the power metallurgy method to prepare a nanoscale Cu-based composite with TiN particles [22] In addition, Ti 2 Cu particles regarded as an inevitable reaction of copper and titanium are a hard and brittle phase and usually used as reinforced particles in copper matrix materials.…”