Material suitable for remanufacturing of 35CrMnSiA and 42CrMo cutting teeth and laser cladding method

Abstract

The invention provides a material suitable for remanufacturing of 35CrMnSiA and 42CrMo cutting teeth and a laser cladding method. The material for remanufacturing of the cutting teeth is laser cladding powder and is composed of iron-based alloy powder, sintered tungsten carbide WC or cast tungsten carbide WC or a mixture of cast tungsten carbide WC and single-crystal tungsten carbide, nickel Ni and CeO 2, wherein the iron-based alloy powder is composed of C, Cr, Si, B, Al and Fe. The hardness of a cladding layer reaches about 53HRC, good abrasion resistance is achieved, the microstructure is ferrite and carbide distributed on the grain boundary, and the abrasion resistance can be improved by taking the carbide as a framework. A three-dimensional diagram of the abraded surface shows that furrows of the abraded surface are slight, and only little pitting corrosion and peeling exist.

Description

technical field [0001] The invention relates to the technical field of pick remanufacturing materials. Specifically, it is a remanufacturing material and laser cladding method suitable for 35CrMnSiA and 42CrMo picks. Background technique [0002] During the working process of the coal mining machine, the pick is mainly used to cut the coal seam, and the pick achieves the purpose of dropping coal by knocking. During the working process, the pick wears quickly, so wear failure is the main form of pick failure. The main failure mode of the pick is different for different coal seam conditions. If the soft coal seam or the geological environment with less gangue, the failure mode of the pick is mainly wear (such as Figure 1a ); for hard coal rocks or geological environments with a lot of gangue, most of the failed picks are broken or lost due to the hard alloy head (such as Figure 1b , 1c ) and pick broken rod. In the prior art, laser cladding technology is used for repair,...

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Problems solved by technology

However, considering the working conditions of the picks, which need to bear sliding wear, impact wear and abrasive wear, the existing Fe-based alloy powders can no longer meet the production and use requirements, especially for the two different picks of 35CrMnSiA and 42CrMo. The physical properties such as thermal expansion coefficient and melting point are completely different. In order to make the reconstituted material and the pick have a good matching relationship, it is usually to choose different reconstituted materials for laser cladding on the two picks. Remanufacturing materials of 35CrMnSiA and 42CrMo picks by laser cladding

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