A kind of iron-based wear-resistant composite material and preparation method thereof

Abstract

The invention discloses an iron-based wear-resistant composite material and a preparation method thereof. The preparation method includes the following process: using a laser cladding method to prepare an iron-based wear-resistant composite coating on the surface of an iron-based alloy base material with iron-based composite powder. layer to obtain the composite body; the surface of the composite body is polished and cleaned; then laser shock is carried out to realize the surface enhancement treatment of the iron-based wear-resistant composite coating; the composite body subjected to laser shock on the surface is subjected to cyclic heat treatment to eliminate residual stress; The iron-based composite powder is micron La 2 o 3 Powder, Micron Al 2 o 3 The powder and micron FeCrNiSiB powder are uniformly mixed, cryogenically treated with liquid nitrogen circulation, and dried. In terms of mass percentage, the iron-based composite powder contains: 0.05% to 10% of micron La 2 o 3 Powder, 0.1%~45% micron Al 2 o 3 powder and 50% to 95% micron FeCrNiSiB powder. The invention improves the service life of the iron-based alloy matrix by preparing a composite coating with good performance on the surface of the iron-based alloy material, and has great significance for the repair and reconstruction of engineering machinery.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, in particular to an iron-based wear-resistant composite material and a preparation method thereof. Background technique [0002] In the fields of machinery manufacturing, petroleum and coal, rail transit, electronic chips, etc., due to the complex and harsh working environment of components and the need to ensure long-term operation, the equipment will be worn, scratched and corroded, resulting in the final failure of components. even scrapped. Relevant data show that the cost of machine damage, failure and scrapping caused by corrosion and wear in the industrial industry is as high as hundreds of billions of yuan every year. At the same time, the data also shows that the number of construction machinery and equipment scrapped each year will be as high as 1.5 million units, which not only means that a large number of machinery and equipment will be scrapped each year due to impr...

AI Technical Summary

Problems solved by technology

However, since the process parameters of laser cladding depend on a single alloy, the prepared coating has problems such as uneven stress, coarse columnar crystals, and easy cracking, which seriously affects the comprehensive mechanical properties of the coating and reduces the coating's impact on the substrate. material protection

Among them, the impact on wear resistance is the most serious. For parts that have been in service for a long time, this indicator is particularly important. Long-term vibration, wear and scratches will cause the coating to gradually expand into macro cracks in the form of micro cracks, and eventually Reduced service life of the coating

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