Composite carbide and carbonitride alloy used for laser cladding

The invention relates to a composite carbide and carbonitride alloy used for laser cladding, and belongs to the science and technology field of new and high-tech material processes. The alloy comprises, by mass percent, 15%-35% of Cr, 8%-50% of W, 2%-25% of Mo, 0.5%-3.0% of V, 0.5%-4.0% of Ti, 4%-20% of Ni, 1.0%-6.0% of C, 0.2%-1.5% of N, 1.0%-15% of Mn, not larger than 2.0% of Si, smaller than 0.03% of S, smaller than 0.03% of P and the balanced Fe. The alloy is prepared according to the component ratio of the alloy and is smelted and atomized into alloy powder. A preset part of a workpiece is covered with the prepared carbide and carbonitride alloy powder in advance. A laser head of a laser device is controlled to conduct laser scanning on the clad alloy powder covering the workpiece in advance on the surface of the workpiece according to a preset route. Under the conditions that the laser power ranges from 1.5 kW to 2.0 kW, the light spot diameter ranges from 4 mm to 5 mm and the scanning speed ranges from 10 mm/sec to 15 mm/sec, according to the cladding layer structure characteristic, MC type, M2C type, M6C type, M23C6 type and M7C3 type multi-element carbide and carbonitride are distributed on a gamma-phase matrix. No mesh-shaped carbide or mesh-shaped structures exist in a texture. The alloy is suitable for surface laser cladding of special tools with requirements for high abrasion resistance and high corrosion resistance.