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 comprises the following steps: preparing an iron-based wear-resistant composite coating on the surface of an iron-based alloy matrix material by using iron-based composite powder by using a laser cladding method to obtain a composite body; polishing and cleaning the surface of the composite body; then carrying out laser shock, and surface enhancement treatment of the iron-based wear-resistant composite coating is achieved; performing cyclic heat treatment on the composite with the surface subjected to laser shock to eliminate residual stress; and the iron-based composite powder is obtained by uniformly mixing micron La2O3 powder, micron Al2O3 powder and micron FeCrNiSiB powder, carrying out liquid nitrogen circulation subzero treatment and drying, and the iron-based composite powder contains the following components in percentage by mass: 0.05%-10% of the micron La2O3 powder, 0.1%-45% of the micron Al2O3 powder and 50%-95% of the micron FeCrNiSiB powder. According to the iron-based wear-resistant composite material and the preparation method thereof provided by the invention, the composite coating with good performance is prepared on the surface of an iron-based alloy material, the service life of an iron-based alloy matrix is prolonged, and the preparation method has great significance in repairing and reconstruction of engineering machinery.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates 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 and other fields, due to the complex and harsh working environment of parts and components, and the need to ensure long-term operation at the same time, it will cause wear, scratches and corrosion of equipment, resulting in the eventual failure of parts and components Even scrapped. Relevant data show that the cost of machine damage, failure and scrap due to 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 every year will be as high as 1.5 million units, which not only means that a large number of...

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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