High hardness gradient enhanced cold roll and preparation method for surface laser cladding coating thereof

Abstract

The invention discloses a high hardness gradient enhanced cold roll and a preparation method for a surface laser cladding coating thereof. The cold roll comprises a cold roll base and the surface laser cladding coating. The surface laser cladding coating is arranged into a gradient structure including a laser cladding priming coating, a laser cladding transition layer and a laser cladding workinglayer. The laser cladding priming layer can reduce a thermal expansion coefficient between the laser cladding coating and the cold roll base with high carbon content, reduce the carbon content, and improve the toughness of the laser cladding coating. By adding the CeO2 strengthening phase, the laser cladding coating microstructure obtains refined grains, and the friction coefficient of the laser cladding coating can be reduced favorably at the same time. By designing the compositional gradient change of the laser cladding coating, the crack sensitivity of the laser cladding coating can be reduced.

Description

technical field [0001] The invention relates to the technical field of rolls, in particular to a high-hardness gradient enhanced cold roll and a method for preparing the surface laser cladding coating thereof. Background technique [0002] At present, the market demand for cold rolls is increasing, and the product quality requirements are also getting higher and higher. During the rolling process, the cold rolls are in close contact with the plate and strip under high pressure, and the working stress is extremely high. At the same time, the inclusions, edge cracks and oxide scales on the rolled piece are broken and peeled off during rolling, resulting in various wear forms. , causing scratches, cracks, or even failure to peel off the surface of the roll, which not only caused a lot of waste of failed rolls, but also caused a huge loss of production efficiency for the enterprise due to shutdown and production stoppage. Therefore, it is very urgent to prepare strengthened col...

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Problems solved by technology

[0004] However, the cladding process of cold rolls in the prior art has certain technical difficulties; when cold rolls are prepared from low-carbon alloys, although good cladding molding can be achieved, the mechanical properties are difficult to meet the use requirements of cold rolls; When the cold roll is made of high-carbon alloy, although the cladding performance can meet the requirements, the large-area cladding layer is prone to cracking, which is difficult to apply to the overall strengthening of the roll.

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