Preparation method for iron-based nickel-coated boron carbide laser cladding material

The invention provides a preparation method for a laser cladding coating prepared from mixed powder of iron-based alloy and nickel-coated boron carbide. The preparation method is characterized by comprising the following steps: step 1, selecting steel No. 45 as a cladding substrate, polishing the substrate with 600-mesh sand paper and cleaning oil stains and rust on the surface of the substrate by using an acetone solution; step 2, separately adding nickel-coated boron carbide powders with mass percentages of 10%, 20% and 30% and 40% and iron-based alloy powder into a dryer, carrying out drying to remove moisture, then fully mixing the powders by using a mechanical powder mixer and pre-placing the mixed powder on the surface of the steel No. 45 substrate, wherein the thickness of the mixed powder is 1.5 mm; and step 3, carrying out cladding with a high-power semiconductor laser, wherein laser output power is 3000 W. Selected laser beam width is 4 to 8 mm, and focal length is 370; a scanning speed is 8 mm/s; and protection gas is argon.