Microstructure and Properties of the Interface Area in the Laser Cladded Ni Based Coatings on the 1Cr10Mo1NiWVNbN Steel

Abstract

Abstract:The Ni-based coatings were deposited on the 1Cr10Mo1NiWVNbN steel by using laser cladding process. The microstructure and properties of the coatings interface area were investigated by OM (Optical Microscopy), SEM (Scanning Electron Microscope), XRD (X-Ray Diffraction) microhardness test and EDS (Energy Spectrum Analysis) analysis. The results show that the bonding condition of the coatings interface is different in the monolayer and the trilayer. The monolayer coatings have a small dilution area. The dilution rate in a coating layer increases by layers. The scale of ferrite (α) phase increases with the layer increases. The surface cladding quality of a monolayer is better than that of the trilayer coatings. The width of the interface increases with the increase of the layer. The width of the interface region in the trilayer coatings increases significantly. The microhardness of the interface zone is much higher than that in the coatings zone and the substrate zone. The microhardness of trilayer coatings is higher than that of the monolayer.

Effect of Annealing Treatment on Microstructure and Properties of Cr-Coatings Deposited on AISI 5140 Steel by Brush-Plating

“…These conditions make the requirements for the wear resistance of the gear more demanding. In addition to improving the wear resistance by solid-solution precipitation of second-phase particles on the substrate via microalloying [5], surface modification by deposition or diffusion coating, such as plasma spraying [6,7], physical or chemical vapor deposition (PVD or CVD) [8,9], pulsed laser or laser cladding treatment [10,11], and thermo-diffusion coating [12,13] are considered effective ways to improve the wear resistance and meet the growing demand of conventional gear steels.…”

Real-Time Monitoring of Chemical Composition in Nickel-Based Laser Cladding Layer by Emission Spectroscopy Analysis

“…In addition, the alloy coating producing by laser cladding is also cost-effective for enabling the salvage of expensive parts, and the point light source with a high energy makes it possible to process the intractable alloy [1]. According to the characteristics of laser cladding, Nickel-based superalloys—with their many excellent properties [2], specific machinability and the expensive cost [3]—are widely applied on the fabrication of laser cladding layers to enhance the performances of the original surface of substrates [4,5,6,7,8]. However, according to the characteristics of laser cladding, the whole cladding layer is prepared line by line overlappingly, and the parts of substrate can be melted and diluted into the cladding layer during the process [1].…”

Effects of V and Cr on Laser Cladded Fe-Based Coatings

“…Laser cladding technology uses a high energy laser beam to melt metal powder materials, and a high performance thick coating with a metallurgical joint to the substrate can be obtained directly with a small amount of subsequent processing [12]. Compared with the other coating technologies, laser cladding has various advantages, such as realizing a highly refined microstructure, low dilution ratio and limited heat affected zone [13]. Meanwhile, laser cladding technology also has the advantages of accurate control and small deformation.…”