Alloy Powder Effect On Microstrcture And Interface WC/Steel Surface Composites

Recently, WC particles/steel surface composite become a new class of advanced materials, but the particle of steel composite materials studies involving domain is not widely, especially have rare reports in the WC ceramic particle/steel composite materials research. Based on this, the paper studies the effects of alloy powder particles to WC surface/steel composite material, The effects of the microstructure, phase, elements changed, microhardness, to lay the theoretical foundation of WC particles/steel surface composite materials research.In the paper, the high-carbon chromium steel substrate surface composites containing different volume fractions of WC particles were fabricated successfully by V-EPC infiltrating casting process. Organizational analysis shows that the organization is matrix composite layer for pearlite, martensite and austenite, its distributed netted connected into white bones, branch shape tungsten carbide is higher primary and black branch shape organization chromium-contained quantity of high carbon, born in net primary carbide substrate with small black in the distribution of eutectic carbide particulate tiny. Among them, Fe3W3C phase is the main primary carbide products, is the main content is higher, the carbon steel products, is to improve the resistance of composite important organization. Three components of the composite layer, tungsten steel base layer of preset surface preparation M6C in composite materials, and the highest content of carbide freshman many smaller particle, abrasion resistance; the WC containing molybdenum preset layer of steel base surface preparation M6C type of composite material, after the content is also more carbon tungsten steel base layer of preset surface preparation of composite materials, better wearability, containing nickel layer, the yankees were preset steel surface composite nickel content is higher in the area, there is a single austenite zone, composite materials in wear-resisting, has good corrosion resistance and high temperature resistant properties.Composite layer organizational changes can be seen for macro hardness change of material:from the composite material of base material to the surface, first increased and then decreased, and the composite layer of average hardness enhanced almost twice as much.Prefabrication of alloy powder on the surface of steel and composite material tissue: compound floor crystal carbide content increase gradually with the increase of the content of alloy, the primary tungsten carbide size, number also increased, composite layer thickness, without defect, composite cast-penetrated layer thickness. Among them, the elements of tungsten and small tungsten particles, and evenly distributed in organizations.Add preset layer of alloy powder WC/steel base surface composite matrix composite layer with high hardness and high chrome matrix, higher microhardness by matrix interface bonding layer by layer direction to increase. In the interface, hardness and union of an interface in both mutations, but there is a low hardness of high hardness gradient from the narrow area. Interface between atomic interdiffusions of forming a good metallurgical combination, body and compound layer between the interface is continuously.