Laser forming method of Cr3C2-FeCr composite component

The invention relates to a laser forming method of a Cr3C2-FeCr composite component. Raw material powder selected in the laser forming method comprises, by weight percent, 4.23-6.31% of graphite, 39.82-47.25% of Cr, 3.26-5.16% of Mo, 0.59-0.71% of rare earth oxide and the balance Fe. Raw materials are in the form of powder, and the particle size of metal Fe powder, metal Cr powder, metal Mo powder and graphite powder is 50-200 microns. Quantitative conveying of powder formed through lasers is finished through a multi-hopper conveying system, four-pipe coaxial and discontinuous powder sprayers are adopted for laser forming, an inner and outer gradient layering structure of the Cr3C2-FeCr component can be achieved by controlling the powder conveying system and a laser head, and the fracture toughness of the Cr3C2-FeCr component can reach more than 70% of Fe base alloy.