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Deep-cooling surface-layer continuous-rolling preparation method for gradient strip

A strip and surface layer technology, which is applied in the field of metal material rolling, can solve the problem that it cannot be used to prepare strips, etc., and achieve the effect of improving the strength

Active Publication Date: 2017-05-17
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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Embodiment Construction

[0016] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0017] The main principle of the invention is to use the plastic deformation of the surface of the material to promote the refinement of the crystal grains in the surface area, and at the same time, use the ultra-low temperature deformation to suppress the recrystallization of the ultra-fine grains during the plastic deformation, thereby forming a nanostructure on the surface of the material. figure 1 Shown is the flow chart of the continuous rolling preparation of the cryogenic surface layer. Through multi-pass cryogenic surface 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:

[0018] The first step: the aluminum or aluminum alloy strip after annealing heat treatment is used as raw material.

[0019] Step 2: Put the strip into the liquid nit...

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Abstract

The invention provides a deep-cooling surface-layer continuous-rolling preparation method for a gradient strip. Grains in the surface-layer area are promoted to be refined through plastic deformation of the surface layer of a material, and meanwhile, recrystallization of ultra-fine grains in the plastic deformation process is restrained through ultralow-temperature deformation, so that a nano-structure is formed on the surface of the material; through multi-pass deep-cooling surface-layer rolling, the strip of a gradient structure is formed through a rolled piece, the surface layer of the material is of an ultra-fine grain structure, and coarse grains are located on the central area of the material; and compared with a material which is prepared through traditional cold rolling, the strength of the material is greatly improved under the condition that the material has better plasticity. Compared with the prior art that deep-cooling surface-layer rolling is only suitable for pure aluminum and aluminum alloy materials currently, through the technique, the tenacity of the material is hardly reduced, and the strength of the material can be improved by 30% or over.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a method for preparing gradient strip material by deep-cooling surface layer continuous 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/002C22F1/04
Inventor 喻海良
Owner CENT SOUTH UNIV
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