The plasma arc spraying welding of high performance alloy layer on the surface of common materials has many advantages, such as less consumption of alloy materials, spraying welding of various alloy powder materials, low cost, high production efficiency, easy to realize automation and so on. Therefore, it is more and more widely used in many fields, such as machinery, metallurgy, power and so on, and has achieved remarkable economic benefits.
Nickel-based alloy tungsten carbide composite coating was prepared on 45 steel surface by plasma spray welding technology. The microstructure, microhardness and wear resistance of the spray welding layer were studied. The results show that the bonding between the spray welding layer and the matrix is close, forming a good metallurgical bonding, and fine grain zone appears at the interface. 45 steel has obvious advantages after spray welding. High hardness and wear resistance of common carbon steel can be used to replace high alloy hot working die steel.
When the content of WC particles exceeds 50%, it is very difficult to add WC composite powder to spray-welded nickel-based alloys (or cobalt-based and iron-based alloys). The main reason is that it is difficult to obtain the "mirror" effect required for spray-welding. Even if spray-welded, WC particles may grow up excessively and lose their high hardness and poor adhesion with the substrate. Or the loss of carbon and the decrease of microhardness are caused by melting loss and dissolution.
Another article: The relationship between particle size of tungsten carbide alloy powder and wear resistance of spray welding layer may be helpful for you to understand the relationship between WC particles and wear resistance.
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