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A kind of continuous asynchronous rolling preparation method of surface layer of gradient strip

An asynchronous rolling and strip technology is applied in the field of continuous asynchronous rolling and preparation of the surface layer of gradient strips, which can solve problems such as inability to use strips, and achieve the effect of improving material toughness.

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods can only be used to prepare rods, not strips

Method used

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  • A kind of continuous asynchronous rolling preparation method of surface layer of gradient strip
  • A kind of continuous asynchronous rolling preparation method of surface layer of gradient strip
  • A kind of continuous asynchronous rolling preparation method of surface layer of gradient strip

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Embodiment Construction

[0015] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0016] The main principle of the invention is to use asynchronous rolling to produce strong shear deformation on the surface of the material, thereby forming a nanostructure on the surface of the material. figure 1 Shown is the flow chart of surface layer continuous asynchronous rolling preparation. Through multi-pass surface asynchronous rolling, the rolled piece forms a strip with a gradient structure, such as figure 1 Shown, the concrete steps of the present invention are as follows:

[0017] The first step: the aluminum alloy strip after annealing heat treatment is used as a raw material.

[0018] The second step: carry out asynchronous rolling on the surface layer of the strip 1, and control the roughness of the roll at about 3 microns. The reduction rate ((H-h) / H) per pass is 2%. Roll speed ratio (V Upper :V Lower ) is controlled at ...

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Abstract

The invention relates to a continuous asymmetrical rolling preparation method for a gradient strip. The asymmetrical rolling is utilized to generate violent shear deformation on the material surface layer, so that a nanometer structure is formed on the material surface. On the basis of multi-pass surface asymmetrical rolling, a rolled piece is formed into a strip with a gradient structure. The surface asymmetrical rolling according to the invention is suitable for aluminum alloy and copper alloy materials at present. On the basis of the technology, under the condition of achieving the same pressure rate of the traditional cold rolling, the strength of the material is almost not reduced but the material toughness can be doubled or above.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a method for preparing a surface layer of a gradient strip by continuous asynchronous rolling. Background technique [0002] At present, ultra-fine-grained metal materials have attracted the attention of scientists for a long time in the past, and people have developed a large number of methods to prepare these materials, such as equal channel extrusion technology, cumulative stack rolling technology, high-pressure torsion technology, etc. However, it has been found that for ultrafine-grained materials, as the strength of the material increases, the toughness of the material decreases sharply. [0003] Researchers have discovered that a gradient structure is formed in the metal material, which can simultaneously achieve good toughness and strength of the material. Gradient materials to form an ultra-fine-grained material structure on the surface of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C22F1/08
CPCC22F1/04C22F1/08
Inventor 喻海良
Owner CENT SOUTH UNIV