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

A technology of laser cladding and cold roll, which is applied in the direction of coating, roll, metal rolling, etc., can solve the problems of difficult roll overall strengthening, cold roll use requirements, and difficult to achieve mechanical properties, so as to achieve no crack pores and improve toughness , the effect of reducing crack sensitivity

Active Publication Date: 2019-03-01
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment 1

[0032] like figure 1 as shown, figure 1 It is a structural schematic diagram of the cross-section of the high-hardness gradient enhanced cold roll of the present invention; the high-hardness gradient enhanced cold roll of the present invention includes a cold roll base 1 and a surface laser cladding coating, and the surface laser cladding coating is set to include The gradient structure of the laser cladding primer layer 2, the laser cladding transition layer 3 and the laser cladding working layer 4.

[0033] Wherein, the laser cladding primer layer 2 is formed by laser cladding of self-fluxing iron-based alloy powder onto the roll body and roll neck surface of the cold rolling roll base 1; the particle size of the self-fluxing iron-based alloy powder is 100 Mesh to 270 mesh, the alloy mass percentage composition is: C: 0.2%, Cr: 17%, B: 1.7%, Si: 1.4%, Mo: 2%, and the rest is Fe. The thickness of the laser cladding primer layer 2 is generally set at 1 mm to 1.5 mm.

[0034...

Embodiment 2

[0040] In this embodiment, the material of the cold roll base 1 is GCr15 high-carbon chromium bearing steel. GCr15 high-carbon chromium bearing steel has high hardenability, and high and uniform hardness can be obtained after heat treatment, but the weldability is poor. Sensitive to white spot formation. In the existing field, the GCr15 cold rolls used for rolling 6mm strips have a very short online service life, and the failure of the rolls causes a lot of waste. At the same time, the shutdown of production and replacement of rolls greatly reduces the production efficiency of the enterprise. The GCr15 cold rolling roll is strengthened by laser cladding through the preparation method of the invention to form a laser cladding coating, so as to improve the performance of the GCr15 cold rolling roll and prolong the service life.

[0041] Specifically, in the present embodiment, the preparation method of the crack-free laser cladding coating on the surface of the GCr15 cold roll i...

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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...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/32C22C38/02C22C38/34C22C38/22B21B27/00
CPCB21B27/00C22C38/02C22C38/22C22C38/32C22C38/34C23C24/103C23C24/106C23C28/028
Inventor 张世宏张林李明喜方钊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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