Abstract
FeCoCrNi-Mo high entropy alloy/diamond composite coatings were successfully prepared by high speed laser cladding. A high scanning speed was adopted (>30 mm/s), and the effects of laser power, scanning speed, and diamond content on the microstructure and wear resistance of the composite coating were studied. The processing parameters of laser cladding had significant influence on the dilution ratio, graphitization of diamond, and wear resistance of the composite coatings. When the laser cladding parameters were 3000 W of laser power and the high scanning speed of 50 mm/s, the composite coating exhibited a uniform microstructure, the lowest dilution ratio, and the best wear resistance. The wear resistance of the composite coating was enhanced with the addition of diamond, but microcracks also increased. When the amount of diamond was 15 wt.%, the best combination of microstructures and wear resistance was obtained.
Highlights
A diamond rope saw is a cutting tool with high hardness and flexibility, and which is widely used in stone cutting in mining and other industries [1,2,3,4]
The interface bonding behavior between the diamond and metal matrix and the effect of laser cladding process parameters on microstructures and mechanical properties were studied. These results show that under the influence of different laser cladding process parameters, there are great differences in the thermal damage and graphitization of diamond particles, the bonding behavior between diamond and metal matrix, porosity and microcracks, and the dilution effect
FeCoCrNi-Mo high entropy alloys (HEAs)/diamond composite coatings were prepared on 42CrMo steel substrate by using laser cladding equipment with a laser line fiber-coupled semiconductor laser (Fraunhofer, Aachen, Germany), ABB manipulator (ABB, Zurich, Switzerland), and coaxial powder delivery
Summary
A diamond rope saw is a cutting tool with high hardness and flexibility, and which is widely used in stone cutting in mining and other industries [1,2,3,4]. The sintering method is to mix diamond and the matrix powders for granulating, and combine them with the metal matrix for sintering This method obtains good wear resistance and a long service life, but the process is complex, and the cost is high. The interface bonding behavior between the diamond and metal matrix and the effect of laser cladding process parameters on microstructures and mechanical properties were studied. High speed laser cladding was adopted in this study, which can make the coating have a good combination with the substrate, and inhibits the graphitization of diamond and the carbonization reaction of metal components in HEA with diamond. The effects of processing parameters, such as laser power and scanning speed, and diamond addition on the microstructure, hardness, and wear resistance of the composite coatings was systematically discussed
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