Laser cladding nickel-based alloy powder and preparation method thereof

Abstract

The invention relates to laser cladding nickel-based alloy powder and a preparation method thereof. The laser cladding nickel-based alloy powder is characterized by comprising the following components by weight percent: 0.2-0.7% of C, 2-3.5% of Si, 1.5-3% of B, 1.0-1.5% of Mn, 3-10% of Cr, 2-5% of W, 3-5% of Mo, 0.5-1% of Nb, 0.5-2% of Co, less than 15% of Fe, 0.2-0.4% of Y, 0.2-0.5% of Ce and Ni and the balance of unavoidable impurity elements. A manufacturing process flow of the laser cladding nickel-based alloy powder is as follows: burdening, smelting, atomizing, drying and sieving. The alloy powder used for laser cladding provided by the invention is corrosion-resistant and also has higher hardness, and a treated laser cladding layer has the advantages of no crack, no pore, no impurity, compact structure and refined grain. A large-area thick crack-free laser cladding alloy layer can be obtained without preheating or follow-up heat treatment, and the cladding layer has the advantages of high strength, hardness and abrasion performance, good plasticity and toughness and low cost.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloys, and relates to a laser cladding alloy powder and a preparation method thereof, in particular to a laser cladding nickel-based alloy powder and a preparation method thereof. The nickel-based alloy powder is suitable for laser cladding. Background technique [0002] Wear and tear generally occurs on the surface of machine parts. At present, it is a relatively new method to improve the wear resistance of machine parts through surface engineering technology. Among these new technologies, laser cladding is a high-tech in the field of modern surface engineering technology. Optical cladding technology refers to placing selected coating materials on the substrate to be clad by different addition methods. After being irradiated by laser, it melts with the surface of the substrate and forms a low-dilution coating with the substrate after rapid solidification. Metallurgically bonded surface coat...

AI Technical Summary

Problems solved by technology

In recent years, some researchers have obtained some iron-based alloy powders for laser cladding, but these powders still have certain limitations. For example, in order to make the laser cladding layer have high hardness and wear resistance, the carbon content in the powder is too high ( % by weight>0.65%) leads to low plasticity and toughness of the laser cladding layer, and the cladding layer is easy to crack when laser cladding a large area and thick iron-based alloy. Another example is to make the laser cladding layer have high plasticity and toughness. Too low carbon content (weight % 20%), which significantly increases the cost of the powder, and is likely to increase the cold crack sensitivity of the laser cladding layer

In short, the thermal spray alloy powders currently used in laser cladding and the iron-based alloy powders specially developed for laser cladding in recent years have considerable limitations.

However, it is limited in application in many occasions, especially in laser cladding, which affects the application of laser technology in the field of modern surface engineering technology.