Method for improving performance of Hastelloy c-276 nickel-chromium-molybdenum alloy laser cladding layer

Abstract

The invention relates to the technical field of nickel-based high-temperature alloy strengthening, in particular to a method for improving the performance of a Hastelloy c-276 nickel-chromium-molybdenum alloy laser cladding layer. In order to solve the problem of hardness improvement, nano chromium carbide, nano tungsten carbide, nano yttrium oxide and nano boron carbide particles with high hardness are adopted as strengthening phases, and meanwhile, the performance of the cladding layer is further improved by utilizing the small-size effect of the nano particles; meanwhile, in order to solve the problems that the nano-particles are easy to suspend and the number of particles actually entering a cladding layer in the cladding process is small, a high-energy ball milling method is adopted to enable the nano-powder and the Hastelloy c-276 powder to be combined in a mechanical alloying mode; and for part of base materials, a laser cladding process can be regulated and controlled after preheating, cracking of the cladding layer is inhibited, and a workpiece is recovered to the design size through a precision machining method after welding. According to the method, the reinforced nickel-chromium-molybdenum cladding layer which is high in hardness and inhibits crack generation is successfully prepared, and an efficient and reliable novel technological method is provided for improving wear resistance and impact resistance of the surface of a part.

Description

technical field [0001] The invention relates to the technical field of nickel-based high-temperature alloy strengthening, in particular to a method for improving the performance of a Hastelloy c-276 nickel-chromium-molybdenum alloy laser cladding layer. Background technique [0002] Nickel-based superalloy Hastelloy c-276 is an alloy grade with a density of 8g / cm 3 , with a melting point of 1290-1350°C, excellent corrosion resistance to inorganic acids, and excellent corrosion resistance to various corrosive media in oxidizing and reducing environments. Hastelloy c-276 alloy exhibits excellent corrosion resistance in many media. Excellent resistance to pitting, crevice, intergranular and erosion in chloride media. [0003] Nickel-based superalloy Hastelloy c-276 powder has good cladding performance, and its application field is relatively wide in actual production, and its wear resistance at high temperature is excellent. [0004] However, this alloy has the defect of ins...

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Problems solved by technology

[0004] However, this alloy has the defect of insufficient hardness. Generally speaking, the hardness is below 300HV, which greatly hinders the application of the powder. Therefore, it is necessary to find an effective method to strengthen the powder. The laser cladding layer can achieve a hardness increase of more than 50%.