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.
Highlights
Fe-based bulk amorphous alloys are gaining more and more attention due to their superior properties, such as higher hardness, higher wear resistance, higher corrosion resistance [1,2,3,4], and lower cost
Amorphous coatings are prepared on surfaces of metallic components to avoid such shortcomings and to take advantage of superior wear and corrosion resistances
The results showed that the coating consisted of an amorphous phase and crystallization phases of Fe2Si, Fe3P, etc., and the coating had a high hardness, wear resistance, and corrosion resistance
Summary
Fe-based bulk amorphous alloys are gaining more and more attention due to their superior properties, such as higher hardness, higher wear resistance, higher corrosion resistance [1,2,3,4], and lower cost. Their applications are restricted by poor tensile ductility and limited size when they are used in bulk form. Basu et al [17] attempted to prepare amorphous coatings by laser cladding Fe48 Cr15 Mo14 Y2 C15 B6 bulk amorphous alloy powders on AISI4140 steel substrates. The microstructure, composition, phase, and properties of the cladding layer were studied
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