Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Abstract

A novel amorphous composite coating was synthesized successfully on 3Cr13 stainless steel by laser cladding Fe-Cr-Mo-Co-C-B amorphous alloy powder. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were used to analyze the microstructure, composition, and phase structure of the coatings. Hardness and friction wear testers were used to analyze the hardness and wear resistance of the coatings. Results show that the cladding layer has an amorphous/crystalline composite structure, which is composed of a columnar grain region at the bottom and an amorphous region in the upper layer. The solute redistribution between the coating and the substrate in the bonding zone and the lower cooling rate at bottom account for the occurrence of crystallization. The highest hardness of the cladding layer is 1179 HV0.5, which is about 6 times that of the 3Cr13 stainless steel substrate (200 HV0.5). The cladding layer greatly improves the wear resistance of the substrate with a much lower coefficient of friction and wear mass loss compared with the substrate.

Mechanical Properties, Electronic Structures, and Debye Temperature of NixBy Compounds Obtained by the First Principles Calculations

“…Researchers have carried out a lot of experimental studies on the properties of Ni-B binary compounds [6][7][8][9]. Laser cladding is a new type of surface modification technology, in which some powders of special properties are cladded onto the surface of a substrate [10,11]. Compared with other traditional surface modification technologies, it can create coatings with better mechanical properties [12,13].…”

Additive Layer Manufacturing using Metal Deposition

“…The preservation of the amorphous nature during laser deposition is partly confirmed in the innovative paper of Hou et al [5]. Considering a Fe-Cr-Mo-Co-C-B alloy powder, and rather classical DED conditions, sound laser deposits were obtained, which were subsequently analyzed by X-ray Diffraction (XRD).…”

A Review on Metallic Alloys Fabrication Using Elemental Powder Blends by Laser Powder Directed Energy Deposition Process

“…Manna et al [78] deposited 94Fe4B2C, 75Fe15B10Si, and 78Fe10BC9Si2Al1C by mixing glass-forming elemental powders on a substrate made by carbon steel. While in Hou et al's work [79], the Fe-based Fe-Cr-Mo-Co-C-B amorphous alloy was produced according to the weight percentage of Fe45.8Mo24.2Cr14.7Co7.8C3.2B4.3. The amorphous phase occupied 52.8% of the entire volume.…”