Laser-cladding high-toughness high-hardness nickel-base alloy powder and preparation method thereof

Abstract

The invention discloses laser-cladding high-toughness high-hardness nickel-base alloy powder and a preparation method thereof. The nickel-base alloy powder is characterized by comprising the following chemical components in percentage by mass: 0.4-0.8% of C, 2-3% of Si, 1-3% of B, 12-18% of Cr, 6-8% of Cu, 0.5-1% of Sn, 10-15% of Fe, 0.2-0.5% of rare earth and the balance of Ni and inevitable impurity elements. The preparation process flow sequentially comprises: dosing, smelting, atomizing, drying and screening. The laser-cladding alloy powder disclosed by the invention has corrosion resistance and relatively high hardness; and the processed laser-cladding layer has the advantages of no crack, no air hole, no impurity, dense tissue, grain refinement and the like. Through the invention, a large-area great-thickness laser-cladding alloy layer without cracks can be obtained without preheating or follow-up thermal treatment, and the laser-cladding alloy layer has the advantages of high strength, hardness and abrasion resistance, good plasticity and toughness, low cost and the like.

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 high-toughness and high-hardness nickel-based alloy powder and a preparation method thereof. The nickel-based alloy powder is suitable for laser cladding. Background technique [0002] Wear is the main form of failure of mechanical shaft parts, and its loss is quite huge. According to statistics, in industrially developed countries, the economic loss caused by wear accounts for about 1-4% of the entire national economic budget. In our country, due to the low level of science and technology, the service life of most mechanical parts is several times or even ten times lower than that of similar foreign products. Spare parts, and due to the reason of the parts, it needs to be shut down for maintenance, which affects the production efficiency and wastes a lot of manpower and m...

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 > 0.85%) 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.