Dredge boat high-strength and ductility high-wear-resisting composite cutter tooth and preparing method thereof

Abstract

The invention relates to the technical field of dredge boat cutter teeth, in particular to a dredge boat high-strength and ductility high-wear-resisting composite cutter tooth and a preparing method thereof. The composite cutter tooth comprises a cutter tooth body and a wear-resisting deposition layer deposited on the tip of the cutter tooth body, and the preparing material of the cutter tooth body is middle carbon alloyed steel. The cutter tooth body comprises, by mass percent, 0.30 to 0.32% of C, 1.35 to 1.43% of Si, 1.40 to 1.60% of Mn, 1.40 to 1.45% of Cr, 0.10 to 0.20% of Mo, 0.20 to 0.25% of Ni, 0.03 to 0.07% of Re, and the balance Fe and some inevitable impurities. The mass percent of S and P in the impurities is smaller than 0.035%, the wear-resisting deposition layer is an iron-based tungsten carbide layer, the content of tungsten carbide ranges from 50 to 55%, and the wear property of the wear-resisting deposition layer is far larger than that of a traditional wear-resistingcutter tooth material.

Description

technical field [0001] The invention relates to the technical field of dredger cutter teeth, in particular to a dredger cutter with high strength, toughness and high wear resistance and a preparation method thereof. Background technique [0002] At present, dredgers are widely used in port and coastal dredging projects. They are mainly used to improve flood control and the river and lake traffic capacity of ships. The reamer teeth are one of the main reasons that affect the working efficiency of dredgers. The middle cutter teeth are in direct contact with materials such as sand, soil, rocks, etc., and are subjected to a large amount of impact and friction during work. The tip of the cutter tooth is subjected to strong sand wear during the working process, which causes serious deformation of the tip of the reamer tooth, resulting in surface wear and even surface material shedding. The main failure mode of the dredger tooth is abrasive wear and fracture. The wear of the cutte...

AI Technical Summary

Problems solved by technology

[0003] At present, the main material of reamer teeth in the domestic market is medium carbon alloy steel. After heat treatment, the hardness of this kind of reamer teeth is usually around 48HRC, and the impact toughness is good. Although it can meet the needs of reamer teeth, the working time is not long , the wear is very serious, and the general service life is less than 50 hours

During the working process, the cutter teeth need to be replaced frequently, which not only consumes a lot of cutter teeth, but also takes a lot of time to replace the cutter teeth, which greatly reduces the production efficiency. The wear and breakage of ship reamer teeth during use increases the service life of the cutter teeth, which is of great help to the development of the domestic dredging industry

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