Phase evolution during laser In-Situ carbide coating

Abstract

With the help of laser surface engineering, in-situ carbide composite coating on the surface of plain carbon steel was achieved. Energy dispersive spectroscopy (EDS) in supplement with X-ray diffractometry indicated the evolution of TiC, Fe-Cr, and M 7 C 3 as major phases in the coating. A variation in the evolution of M 7 C 3 phase was observed with respect to the laser power over the range of 900 to 2100 W (3 mm ϫ 600 m rectangular beam spot) during processing. Computational techniques were employed with the aim of studying possible reasons for phase evolution, stability of phases, solidification path, and optimization of parameters to stabilize the M 7 C 3 phase and hence tailor properties.

Microstructure and Sliding Wear Behaviour of In-Situ TiC-Reinforced Composite Surface Layers Fabricated on Ductile Cast Iron by Laser Alloying

“…Some published works concerning the in-situ synthesis of composite materials suggest that the experimental results should be complimented by the modelling and simulation of the solidification behaviour of the fabricated alloy system [18,19]. The use of computational thermodynamics allows an evaluation of phase stability in multicomponent systems as a function of temperature and composition and therefore provides the critical basis for understanding phase stability during the in-situ processing of composite materials [20,21].…”

In-situ synthesis of titanium carbide particles in an iron matrix during diode-laser surface alloying of ductile cast iron

“…The difficulty with the in-situ fabrication of CSLs is related to the fact that the distribution homogeneity and the average particle size of an RP depend on the solidification conditions and the fluid flow in the molten pool, so they are difficult to control. [8][9][10] Laser surface alloying is particularly well suited to the needs of the in-situ fabrication of the CSLs, mainly due to an accurate control of the molten-pool solidification. 11 Moreover, the molten pool generated during laser processing undergoes a rapid solidification, which provides a unique opportunity to synthesize non-equilibrium phases.…”

“…11 Moreover, the molten pool generated during laser processing undergoes a rapid solidification, which provides a unique opportunity to synthesize non-equilibrium phases. 10 To date, a number of studies have focused on the laser surface alloying of both grey and ductile cast irons in order to improve the wear resistance. Some studies also attempted to investigate the in-situ formation of CSLs on a cast-iron substrate.…”

Effect of milling of C and Ti mixture as ceramic coating on the properties of 7Ch3 tool steel during plasma spray process

“…[1][2][3][4][5][6][7][8] TiC coatings are produced by chemical and physical vapor deposition, sputtering, laser, cathodic arc and ion plating. 3,[9][10][11][12][13][14][15] Furthermore, this material can be plasma sprayed (as one of categories of thermal spray process). The energy sources for heating are usually microwaves, gamma radiation, electromagnetic radio frequencies and electric arcs.…”

“…The plasma spraying process lends itself to spraying on large parts over a large area and, hence, is of considerable current interest. 12,[16][17][18][19][20] TiC can be synthesized by different routes such as direct reaction of the elements, carbothermal reduction and self-propagating high-temperature synthesis. In most cases, these techniques require expensive furnaces and high temperature which could be higher than the melting point of TiC.…”