A wear-resistant high-speed steel coating with high tungsten and molybdenum content and its preparation method

Abstract

The invention discloses a wear-proof high-speed steel coating with the high tungsten content and the high molybdenum content and a preparation method of the wear-proof high-speed steel coating, and belongs to the technical field of metallurgy. The wear-proof high-speed steel coating is prepared through a laser-cladding rapid solidification method. According to the main chemical components, the wear-proof high-speed steel coating comprises, by weight percentage, 0.9%-1.3% of C, 7%-14% of W, 6%-9% of Mo, 1.0%-2.0% of V, 3.5%-5.0% of Cr, 0.5%-5.0% of Co, smaller than 0.5% of Si, smaller than 1.0% of Mn, smaller than 0.04% of S, smaller than 0.04% of P and the balance Fe. After laser cladding is accomplished, the coating can be directly processed through tempering at the temperature ranging from 470 DEG C to 560 DEG C, and the hardness of the coating can be remarkably improved. Compared with tungsten-molybdenum-series W6Mo5Cr4V2 high-speed steel prepared under the same condition, the wear-proof high-speed steel coating has the advantages that due to the high tungsten content and the high molybdenum content, the content of the hard carbide in a tempered structure can be increased, the tempering hardness and the wear resistance are obviously improved, and manufacturing of hot roll, cutting tool and die surface laser-cladding high-wear-resistance coatings with the high requirements for the high hardness and the high wear resistance can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a wear-resistant high-speed steel coating with high tungsten and molybdenum content and a laser cladding preparation method thereof. Background technique [0002] High-speed steel is a high-alloy steel containing tungsten, molybdenum, chromium, vanadium and other strong carbide-forming elements. After proper heat treatment, it has excellent red hardness, thermal stability, oxidation resistance and thermal wear resistance. It is widely used in the field of grinding tools, knives, cutting tools, hot rolls and surface coating manufacturing of such materials. The wear resistance of high-speed steel mainly depends on the type and content of carbides in its structure. The more hard carbides, the finer the size, and the more uniform the distribution, the better the wear resistance. [0003] High-speed steel is classified according to the type of alloying elements added, ...

AI Technical Summary

Problems solved by technology

However, this type of technology still mainly uses the traditional block high-speed steel composition and high-temperature quenching and tempering process in terms of composition and heat treatment technology. Since rapid solidification inhibits the precipitation and growth of carbides, the coating prepared by this type of method It is generally found that the hard phase content is significantly less than that of block high-speed steel with the same composition, and the high-temperature quenching and tempering process is likely to cause the growth of the solidification structure of the coating and a large amount of oxidation loss of the material

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