Process for laser cladding of nickel-based tungsten carbide on surface of nickel-aluminum bronze

Abstract

The invention relates to a process for laser cladding of nickel-based tungsten carbide on the surface of nickel-aluminum bronze. The process comprises the following steps that (1) the surface of the nickel-aluminum bronze is cleaned, and burrs and oil stains are removed; (2) process parameters are set through laser cladding equipment, and laser cladding is conducted on a nickel-aluminum bronze plate; and (3) after laser cladding is completed, after the nickel-aluminum bronze plate is naturally cooled, dye penetrant inspection is carried out, whether air holes, cracks and other phenomena exist or not is checked, then machining is carried out, the adopted nickel-based tungsten carbide is Ni50 + 60% WC, the hardness of a final cladding layer is HRC45-52, the thickness is 1.8-2.5 mm, and the defects of air holes, slag inclusion, micro cracks, spalling and the like do not exist, and tungsten carbide cladding on the surface of the nickel-aluminum bronze is achieved. The corrosion resistance and wear resistance of the nickel-aluminum bronze are enhanced, the service life of the key parts of ships and the like made of the nickel-aluminum bronze which is in contact with seawater is prolonged, and the nickel-aluminum bronze has wide application benefits.

Description

technical field [0001] The invention relates to the field of ship parts manufacturing, and specifically relates to a nickel-aluminum bronze surface laser cladding nickel-based tungsten carbide process, which is suitable for strengthening treatment of the marine nickel-aluminum bronze surface. Background technique [0002] Nickel-aluminum bronze has excellent resistance to stress corrosion cracking, corrosion fatigue, cavitation corrosion, erosion and marine pollution. In the marine environment, cavitation and corrosion will work together to further damage marine components, causing damage and accidents to marine components. Therefore, nickel aluminum bronze has been widely used in the manufacture of ship parts, such as marine propellers. However, nickel-aluminum bronze has two main disadvantages: poor wear resistance; reduced corrosion resistance in polluted seawater, and sensitivity to phase selection corrosion, so it is necessary to strengthen a corrosion-resistant and we...

AI Technical Summary

Problems solved by technology

However, due to the two main disadvantages of nickel-aluminum bronze: poor wear resistance; reduced corrosion resistance in polluted seawater, and sensitivity to phase selection corrosion, it is necessary to strengthen a corrosion-resistant and wear-resistant coating on its surface

[0003] With the development of surface modification technology, laser cladding technology has gradually been widely used. Laser cladding adds cladding materials on the surface of the substrate and uses a high-energy-density laser beam to fuse it together with the thin layer on the surface of the substrate. The method of forming a metallurgically-bonded cladding layer on the surface of the base layer, Chinese patent: preparation process for laser cladding nickel-based tungsten carbide coating on valve plate, patent authorization announcement number: CN 108441857 B, patent authorization announcement Day: 2019.11.08, the inventive process can effectively avoid the cracking of the nickel-based carbide coating and the deformation of the valve plate, but it cannot be applied to the large-area cladding of the nickel-based tungsten carbide coating on the surface of nickel-aluminum bronze. Preheating and heat preservation processes, and at the same time, defects such as pores, slag inclusions, cracks, and peeling are likely to occur during the actual laser cladding process on the copper alloy surface, resulting in shortened life after laser cladding. Therefore, it is necessary to design a nickel-aluminum bronze Surface laser cladding nickel-based tungsten carbide process to solve the above problems

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