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A method for preparing fine-grained metal materials by equal channel angular extrusion

A technology of equal-channel corners and metal materials, which is applied in the field of preparation of fine-grained metal materials by channel corner extrusion, can solve the problems of low production efficiency and achieve the effects of improving productivity, reducing mold wear, and reducing friction coefficient

Active Publication Date: 2015-11-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing ECAP method has many advantages, it also has disadvantages, such as low production efficiency, and usually requires multi-pass deformation to obtain uniform and fine grains. Therefore, it is urgent to find the best method for ECAP deformation of metal materials. Optimal extrusion path, reducing extrusion passes and improving production efficiency

Method used

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  • A method for preparing fine-grained metal materials by equal channel angular extrusion
  • A method for preparing fine-grained metal materials by equal channel angular extrusion
  • A method for preparing fine-grained metal materials by equal channel angular extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Extrude the 5N5 high-purity aluminum ingot of Φ150mm×300mm into a Φ40mm round bar on the press, and then make a Φ40×120mm cylindrical billet matching the diameter of the cylindrical inner cavity of the extrusion die;

[0035] (2) Apply lubricant on the surface of the cylindrical billet, the cavity of the extrusion die and the surface of the extrusion rod, place the cylindrical billet in the extrusion die for extrusion, and cut off the extrusion after each pass For the tongue and tongue tail, the billet is rotated clockwise by 135°, and then the next extrusion is carried out. A total of 2 passes are performed to obtain a high-purity aluminum fine-grained extrusion material with refined grains.

[0036] In order to verify the beneficial effect of the present invention, select path B C , A and C to conduct 2-pass extrusion comparison experiments, in the traditional path, it is generally believed in the prior art that path B C , that is, the grain refinement effect of ...

Embodiment 2

[0039] (1) Extrude the 5N5 high-purity aluminum ingot of Φ150mm×300mm into a Φ40mm round bar on the press, and then make a Φ40×120mm cylindrical billet matching the diameter of the cylindrical inner cavity of the extrusion die;

[0040] (2) Apply lubricant on the surface of the cylindrical billet, the cavity of the extrusion die and the surface of the extrusion rod, place the cylindrical billet in the extrusion die for extrusion, and cut off the extrusion after each pass For the tongue and tongue tail, the billet is rotated clockwise by 135°, and then the next extrusion is carried out. A total of 8 passes are performed to obtain a high-purity aluminum fine-grained extrusion material with refined grains.

[0041] For further comparison and description, under the same conditions, the billet is rotated 90° clockwise and then the next extrusion is carried out, that is, the path Bc is used, and a total of 8 extrusions are carried out to obtain high-purity crystals with refined grain...

Embodiment 3

[0045] (1) Extrude the 5N5 high-purity aluminum ingot of Φ150mm×300mm into a Φ40mm round bar on the press, and then make a Φ40×120mm cylindrical billet matching the diameter of the cylindrical inner cavity of the extrusion die;

[0046] (2) Apply lubricant on the surface of the cylindrical billet, the cavity of the extrusion die and the surface of the extrusion rod, place the cylindrical billet in the extrusion die for extrusion, and cut off the extrusion after each pass For the tongue and tongue tail, the billet is rotated clockwise by 45° and then the next extrusion is carried out. A total of 8 passes are performed to obtain a high-purity aluminum fine-grained extrusion material with refined grains. The macroscopic structure diagram is as follows Figure 5 shown, from Figure 5 It can be seen that the grain structure of the aluminum material obtained by the extrusion method of this embodiment is effectively refined.

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Abstract

The invention belongs to the technical field of metal material formation, and in particular relates to a method for preparing fine crystal metal materials through equal-channel angular pressing. The method for preparing the fine crystal metal materials through the equal channel angular-pressing comprises the following steps of: firstly, pressing metal ingot blanks on a pressing machine into round bars; then preparing cylindrical blank materials with the size matched with the inner diameter size of a cylindrical inner cavity of a pressing mold, coating a lubricating agent on the surfaces of the cylindrical blank materials and the surfaces of a mould cavity of the pressing mold and a pressing rod, and placing the cylindrical blank materials into the pressing mold for pressing; cutting tongues and tongue tails of pressing elements after pressing for each time, rotating the blank materials clockwise or anticlockwise at theta, wherein the theta is greater than 0 degree and is less than 180 degrees; pressing again for the next time, and pressing for 2-12 time totally, so as to obtain the metal fine crystal pressing materials with refined crystal grains. The method provided by the invention improves the ECAP (equal channel angular pressing) refining effect through expanding a pressing path, reduces the pressing times, and expands the ECAP application range.

Description

technical field [0001] The invention belongs to the technical field of metal material forming, and in particular relates to a method for preparing fine-grained metal materials by equal-channel angular extrusion. Background technique [0002] According to the Hall-Petch function relationship, the smaller the average grain size, the greater the deformation resistance of the metal; at the same time, the smaller the grain size, the higher the toughness index of the metal, so the refinement of the metal microstructure is to improve the metal material An effective means of strength and toughness. Equal Channel Angular Processing (ECAP for short) is a large plastic deformation processing method that uses pure shear deformation to achieve material grain refinement. The great concern of foreign material circles. Equal angular extrusion was proposed by the former Soviet scholar Segal in the 1980s. During the ECAP extrusion process, the cross-sectional area of ​​the sample remains un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C21D7/02
Inventor 班春燕崔建忠
Owner NORTHEASTERN UNIV LIAONING