Composite powder material for laser surface strengthening of ball valve and application of composite powder material

Abstract

The invention relates to a composite powder material for laser surface strengthening of a ball valve. The composite powder material comprises 60-85 wt% of nickel-based powder; 15 to 40 wt% of metal ceramic powder; uniformly mixing the nickel-based powder with the titanium carbide powder; the nickel-based powder comprises the following elements in percentage by mass: 17.0 to 25.0 percent of Cr, 6.0 to 12.0 percent of Mo, 2.15 to 5.50 percent of Nb, 0.01 to 5.0 percent of Fe, 0.01 to 0.1 percent of C, 0.01 to 0.8 percent of Al, 0.01 to 0.3 percent of Si, 0.01 to 1.15 percent of Ti and the balance of Ni; the metal ceramic powder comprises the following elements in percentage by mass: 19.1-20.0% of C and the balance of Ti; after the composite powder material is used for strengthening the surface of the ball valve, the wear resistance of the ball valve is improved through metal ceramic phases which are distributed in a dispersed mode on the basis that the corrosion resistance of nickel-based alloy is considered; and meanwhile, a laser cladding process is adopted, so that the coating and the base material are metallurgically bonded, the bonding strength is higher, and the problem that the coating is easy to fall off from the base material under high temperature, high pressure and high load is avoided.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a composite powder material used for laser surface strengthening of ball valves. Background technique [0002] Ball valve is a kind of valve with sphere as the opening and closing part, which is widely used in petroleum, paper, chemical, water conservancy, pharmaceutical, electric power, steel and other industries, and occupies a pivotal position in the national economy. Due to the environmental characteristics of installation and use, ball valves are often exposed to corrosive environments, especially for gas, petroleum and coal chemical industries, which often contain corrosive liquid and gaseous media, resulting in rapid corrosion and wear of ball valves cladding in harsh environments. . Therefore, in order to reduce the loss caused by the corrosion of the ball valve, prolong the service life of the ball valve under harsh working conditions, and make it work safely and reliab...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the surface of the existing ball valve is strengthened with wear resistance and low corrosion resistance, and the coating and the base material are easy to fall off under harsh conditions, the present invention provides a composite powder material for laser surface strengthening of the ball valve. After the composite powder material is strengthened on the surface of the ball valve, on the basis of taking into account the corrosion resistance of the nickel-based alloy, its wear resistance is improved through the dispersed cermet phase; at the same time, the laser cladding process is used to achieve metallurgical bonding between the coating and the substrate. The bonding strength is higher, avoiding the problem that the coating is easy to fall off from the substrate under high temperature, high pressure and high load