Laser cladding nickel-based alloy powder for repairing damaged blower blades and its repairing method

Abstract

The invention discloses laser cladding nickel base alloy powder for repairing a damaged blower vane and a repair method. The laser cladding nickel base alloy powder comprises the raw materials by mass percent: 12.0-18.0% of Cr, 40-47% of Ni, 1.0-3.0% of W, 2.0-4.0% of Mo, 30.0-40.0% of Fe and 2.0-4.0% of Co. The repair method comprises the steps that the damaged blower vane is subjected to cladding pretreatment; by adopting a numerical control laser cladding machine, and in an argon atmosphere, by adopting a CO2 laser as a lasing source and adopting a tapered powder bundle coaxial powder deliver mode, the damaged blower vane is subjected to multitrack lapping laser cladding with prepared mixed powder. According to the invention, two elements, namely Co and Cr, are adopted to stabilize a principal phases, the toughness and the erosion resistance are improved by adding W and Mo, and cracking phenomena during cladding layer multitrack lapping are reduced. The design is simple and reasonable; on the premise of ensuring the repair quality of an impeller of an axial flow blower, the anti-scouring corrosion capacity of the surface of the impeller can be improved effectively; and a cladding powder material having high performance and high reliability is provided for prolonging the service life of the blower.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment surface remanufacturing, and more specifically relates to the design of a nickel-based alloy cladding powder that uses laser cladding technology to improve the anti-erosion performance of impeller blade surfaces, and belongs to the technical field of surface engineering and remanufacturing. Background technique [0002] In the field of petroleum and metallurgy, a large blower is one of the necessary power equipment. During the service period of the fan, its core components such as the main shaft, impeller, and blades are vulnerable to Al 2 o 3 , SiO 2 Erosion of solid particles and H 2 S, SO 2 , CO 2 The corrosion of chemical substances such as , CO, etc. makes the surface of the parts prone to wear and eventually leads to failure. At present, there are two ways to solve this problem. One is to use 2Cr13, 0Cr17Ni4Cu4Nb stainless steel and other materials to prepare impellers and...

AI Technical Summary

Problems solved by technology

Among them, the Fe-based alloy powder is similar to the matrix composition, which can significantly improve the interfacial bonding force between the cladding layer and the matrix, but the corrosion resistance of the Fe-based alloy powder is poor, and it is difficult to meet the requirements of complex working conditions; the Co-based alloy powder is relatively For iron-based alloy powder, it can effectively improve the corrosion resistance of the impeller surface, but the hardness of the cladding layer is significantly reduced, and the flatness of the cladding layer surface is not high; For this kind of alloy powder, although the cost is the highest, it has the best corrosion resistance and the hardness of the cladding layer is the highest.

Therefore, in order to improve the erosion resistance of the impeller, it is most appropriate to use Ni-based powders, but Ni-based powders can easily cause cracks in the cladding layer. If the composition and proportion of the alloy powder and the cladding process can be adjusted, it is expected to inhibit cladding Generation of layer cracks

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