Tribology Property of Laser Cladding Crack Free Ni/WC Composite Coating

Abstract

In order to improve wear resistance, the Ni/WC composite coating was prepared on NAK80 mold steel surface by laser cladding technology. Phase and microstructure had been investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Dry sliding tribological properties at room temperature of the coating had been researched by ball-on-disc wear tests. Results indicated that phase constituents of the coating were mainly composed of WC, W 2 C, Cr 23 C 6 , NiCr, CrB 2 and £-Ni, etc. There was a chemical metallurgical bonding between the coating and the steel substrate. Higher wear resistance of NAK80 mold steel was achieved after cladded by the Ni/WC composite coating, which was mainly related to dendrite phases Cr 23 C 6 and hard phases WC, W 2 C dispersing in the coating.

Thermomechanical Wear Testing of Metal Matrix Composite Cladding for Potential Application in Hot Rolling Mills

“…Several methods for experimental testing of tribology and wear behavior of potential roll and cladding materials have been used by researchers. The majority of these methods can be roughly classified as 1) pin‐on‐disc or ball‐on‐disc tests, 2) ring‐on‐bock tests with different setups, 3) block‐on‐disc tests with or without addition of abrasive particles, and 4) disc‐on‐disc or roll‐on‐roll tests with two or even three discs or rolls, respectively. Among those test methods, in particular, the roll‐on‐roll tests are suitable to simulate the combined effects of relative motion (slip effects) and high contact pressure between the rolls of the rolling mill and the metal strip.…”

“…MMC claddings typically consist of crushed or spherical tungsten carbide particles embedded into an iron‐, cobalt‐, or nickel‐based matrix. The microstructure and the wear behavior of these claddings are generally well studied at room temperature, but only a few investigations focus on their particular wear behavior at elevated temperatures . At room temperature, abrasive wear tends to decrease with increasing hardness of the MMC cladding, i.e., with increasing content or size of the hard particles inside the matrix, respectively.…”

Characteration of Laser Cladded Fe-Mn-Cr Alloy Coatings Modified by Plasma Nitriding

“…The width and depth of wear scar of each sample was measured using Axio CSM true color confocal microscope. According to Cheng et al 3) , the wear volume, V w and wear rate, K can be calculated from the wear track dimensions, such that…”

“…Laser cladding technique can be employed to repair the worn surface of a mould locally 2) . During this process, high-performance coating material is cladded onto the mould surface, where the coating materials possess excellent properties: low dilution rate, homogenized and dense microstructure, good bond between the cladding layer and the substrate, and low heat affect [3][4][5] . This technique can repair mould parts to original dimensions, and improve the wear resistance, corrosion resistance, heat resistance, fatigue resistance of mould surfaces 6,7) .…”

The Effect of Thickness on the Properties of Laser-Deposited NiBSi-WC Coating on a Cu-Cr-Zr Substrate

“…Laser-deposited metal matrix composites (MMCs) like Ni60WC are characterised by high wear resistance and minimal cracking when applied to steel substrates: This is due to an elastic matrix reinforced with fused tungsten carbides [7,8]. Depending on the rate of heating and cooling, mono-tungsten carbide (WC) and di-tungsten carbide (W 2 C), characterized by a high level of hardness (16)(17)(18)(19)(20)(21)(22), may be present in the final structure [9].…”