Laser cladding composite coating on mild steel using Ni–Cr–Ti–B₄C powder

Abstract

The composite coating was fabricated by laser cladding on Q235 mild steel. The cross-section morphology, microstructure, phase, micro-hardness and wear resistance of the coating were investigated by scanning electron microscope, energy dispersive spectrometry, X-ray diffraction, Vickers micro-hardness tester and dry sliding wear testing machine, respectively. Results showed that composite coating was gained without cracks and bonded with substrate excellently because of the prominent metallurgical bonding. The composite coating was made up of Ni 3 Ti, Cr 2 Ti, Ni-Cr-Fe, TiB 2 and TiC. Ceramic reinforcements existed in coating with eutectic and independent structures. The micro-hardness of coating was about 5 times the substrate. Compared with substrate, the coating showed superior wear resistance.

Effect of carbon nanotubes content on microstructure and properties of WC/Ni laser cladding coatings

“…Ceramic materials are possessing outstanding advantages of high melting point, hardness, and wear resistance. They are used as reinforced phase materials commonly, including oxide ceramics, carbide ceramics, nitride ceramics [7,8]. Tungsten carbide powder is often used to improve the strength of the metal coating, where the preparation of Ni/WC coating has aroused the interest of many scholars.…”

Enhanced mechanical properties of molybdenum-coated aluminium via laser cladding

“…During the movement of the laser beams, the G and R vary spatially within the molten pool. The value of G reaches the maximum at the boundary of the molten pool and the minimum at the centre line owing to the Gauss distribution of the laser energy [27]. R strongly depends on the location of the molten pool under the same scanning speed.…”

“…Besides, the solidification structure heterogeneity between internal and peripheral molten pool regions is observed in the LR/LC coating (Figure 4). This phenomenon can be explained by the well-known non-steady solidification theory [25][26][27]. Generally, the ratio G (thermal gradient)/R (growth rate) at the solid-liquid interface determines the solidification mode and the product GR determines the size of the microstructure.…”

Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

“…In Fe-TiC alloy, secondary phases, such as Fe 2 Ti, are generated [27]. When Ni is added, Ti 2 Ni, NiTi, and Ni 3 Ti are developed [28,29], and Cr 2 Ti is detected in Cr-Ti [30].…”