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Preparation method of texture controllable fine grain metal material based on large strain deformation and recrystallization

A metal material and large strain technology, which is applied in the field of preparation of texture-controllable fine-grained metal materials, can solve problems such as difficult to obtain texture-controllable fine-grained metal materials, and achieve the effect of increasing hardness and yield strength

Active Publication Date: 2011-03-30
JIANGYIN HENGYE FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that it is difficult to obtain fine-grained metal materials with controllable texture during large-strain processing and subsequent heat treatment, and to invent a method for preparing texture-controllable fine-grained metal materials based on large-strain deformation and recrystallization. Obtain fine-grained materials and make the XRD spectrum (ie X-ray diffraction spectrum) of the material close to the ideal state

Method used

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  • Preparation method of texture controllable fine grain metal material based on large strain deformation and recrystallization
  • Preparation method of texture controllable fine grain metal material based on large strain deformation and recrystallization
  • Preparation method of texture controllable fine grain metal material based on large strain deformation and recrystallization

Examples

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Effect test

Embodiment 1

[0021] Example 1: The billet is made of annealed commercially pure aluminum, wherein the rolling strain is 1.75 (download 80%), and the ECAP strain is 0.8. Heat treatment is carried out at 200° C., heat preservation for 1 hour, and air cooling. The prepared industrial pure aluminum has a crystal grain size of 1-2 microns and a sub-grain size of about 50 nanometers, and its yield strength is 60% higher than that of the original blank, and its hardness is 50% higher than that of the original blank.

Embodiment 2

[0022] Example 2: The billet is made of annealed industrial pure aluminum, wherein the rolling strain is 0.4 (download 50%), the ECAP strain is 0.8, heat treatment is carried out at 500° C., heat preservation for 1 hour, and air cooling. The prepared industrial pure aluminum has a good texture orientation, and its XRD spectrum ( image 3 ) is very close to the standard XRD spectrum of pure aluminum ( figure 1 ),from figure 2 As can be seen, the XRD and standard XRD spectra ( figure 1 ) is very different.

Embodiment 3

[0023] Example 3: The blank is made of annealed 5052 aluminum alloy, the rolling strain is 0.4 (download 50%), the ECAP strain is 0.8, heat treatment is carried out at 500° C., heat preservation for 1.5 h, and air cooling. The prepared 5052 aluminum alloy has a good texture orientation, and its XRD spectrum is very close to that of ideal industrial pure aluminum.

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Abstract

A preparation method of texture controllable fine grain metal material based on large strain deformation and recrystallization includes large strain predeformation and recrystallization heat treatment. The preparation method is characterized in that the large strain predeformation includes that blanks are firstly subject to rolling by multi-pair rolling wheels, so that the blanks get thinner and deformation degree of the blanks rolled by multi-pair rolling wheels is not less than 50%; secondly an equal channel angular pressing mould is arranged at the outlet of the last pair of rolling wheel,so that the thinner blanks after rolling carry out ECAP deformation; and the recrystallization heat treatment includes that the blanks after the large strain deformation are fed into a thermal treatment furnace, temperature is maintained to be 150-500 DEG C for 0.5-2h, and then air cooling is carried out. The invention combines the advantages of the multi-pair wheel rolling technology and the equal channel angular pressing technology and can realize energy-saving, high-efficiency, continuous and uniform large strain deformation processing of metal material; and the prepared metal material hasthe characteristics of small grain crystal, strength and hardness far higher than supply state and wonderful texture orientation and the like.

Description

technical field [0001] The invention relates to a method for modifying metal materials, especially a method for modifying metal materials that combines pre-shaping and recrystallization technology with a deformation amount greater than 10%, specifically a method based on large-strain deformation recrystallization A method for preparing a texture-controllable fine-grained metal material. Background technique [0002] As we all know, recrystallization heat treatment of pre-deformed metal materials is one of the most effective methods for obtaining fine-grained metal materials. When other conditions are the same, the recrystallized grain size is directly related to the pre-deformation degree of the metal material. When the degree of deformation is below 2%, the grain size is basically unchanged because the lattice distortion is small enough to cause recrystallization; when the degree of deformation is in the range of 2% to 10%, the deformation is small and extremely uneven , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C22F1/00
Inventor 许晓静王宏宇程晓农崇凯张增雷赵梓皓成城
Owner JIANGYIN HENGYE FORGING
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