Alloy powder and alloying treatment process for laser surface alloying of low-nickel-chromium infinitely chilled cast iron rolls

Abstract

The invention provides an alloy powder for low-nickel / chromium infinite chilled cast iron roll laser surface alloying and an alloying technique thereof. The alloy powder comprises WC, TiC, Ni, Cr, Co, Si, Mo and Y2O3 powders. The invention also provides an alloy powdering technique which comprises the following steps: removing rust by sanding a roll surface to be treated, removing oil stains on the surface with an organic solvent, mixing the alloy powder and a varnish ethanol solution, uniformly spraying the mixed solution on the working surface of the roll to be treated, airing, scanning the roll surface with a laser so as to melt and mix the alloy powder and roll surface layer, thereby forming a laser alloyed layer, and the like. When the alloy powder and alloying technique are utilized to perform laser alloying on the low-nickel / chromium infinite chilled cast iron roll, a superfine-structure alloy layer is formed on the working surface of the roll, thereby improving the microhardness and enhancing the steel throughput of the roll.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an alloy powder for metal laser alloying and an alloying treatment process, in particular to an alloy powder and an alloying treatment process for laser surface alloying of low-nickel-chromium infinite chilled cast iron rolls. Background technique [0002] The quality and service life of rolls are directly related to the production efficiency, product quality and economic benefits of the enterprise. The performance of domestic rolls, especially nickel-chromium infinite chilled cast iron rolls, is generally lower than that of similar foreign products, and high-performance rolls still rely on imports. Therefore, how to improve the quality and precision of domestic rolls, increase their service life, and reduce production costs has become an urgent problem to be solved at present. [0003] The key factor affecting roll performance, product quality and its service life...

AI Technical Summary

Problems solved by technology

At present, most of the existing technologies are to add cemented carbide powder, such as SiC, WC, TiC, etc., or in-situ generate intermetallic compounds such as carbides, nitrides, borides and other intermetallic compounds during the laser surface alloying process to strengthen the alloyed coating. Wear resistance, although it can form a high-hardness, high-wear-resistant alloy layer on the surface of the steel, which can improve the service life of the roll to a certain extent, but because its formula selection is not reasonable enough, there are penetrating cracks and pores when it is applied to cast iron materials. Seriously affect the surface quality of the alloy layer, its service life and technical effects are not ideal, especially the application on large-area rolls is still in the stage of experimental exploration, the biggest problem at present is that the alloy layer is easy to fall off during the rolling process, which seriously affects The application effect of laser alloying treatment is limited, which limits the popularization and application of this technology