Hot extrusion production technique for improving plastisity of magnesium alloy sectional material

A production process, hot extrusion technology, applied in metal extrusion, metal extrusion control equipment, metal processing equipment, etc., can solve problems affecting product processing and mechanical properties, high local temperature, destructive plasticity, etc., to achieve convenience Calculate and apply the effect

Inactive Publication Date: 2009-12-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the deficiencies of the prior art, and provide a hot extrusion production process for improving the plasticity of magnesium alloy profiles. It adopts two-stage homogeneous annealing treatments with different temperatures on magnesium alloy blanks to solve the problem of magnesium alloy heat dissipation. In the extrusion production process, the charging of the hot furnace can easily cause the local temperature caused by the uneven temperature in the furnace to be too high, resulting in non-equilibrium low melting point eutectic melting, affecting the processing and mechanical properties of the product, especially the problem of destroying its plasticity, so as to meet the Extrusion deformation at ultra-high temperature to improve the plasticity of magnesium alloy profiles

Method used

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  • Hot extrusion production technique for improving plastisity of magnesium alloy sectional material
  • Hot extrusion production technique for improving plastisity of magnesium alloy sectional material
  • Hot extrusion production technique for improving plastisity of magnesium alloy sectional material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put the ZM21 magnesium alloy billet into the heating furnace when the furnace temperature is less than 250°C, use the conventional heating rate to raise the temperature to 350°C with the furnace, and keep the constant temperature. The temperature of the furnace is raised to 430°C, and the constant temperature is maintained, and the billet is continuously subjected to the second-stage homogenization annealing at the constant temperature for 5 hours. The temperature rise rate from the first stage to the second stage with the furnace temperature rise can be ignored because of the basis of the homogenization annealing of the first stage.

[0037] After the billet is annealed, it is air-cooled and then loaded into the extruder for hot extrusion deformation.

[0038] When extruding a bar with a cross-sectional area of ​​11.6 square millimeters (12 millimeters in diameter), a 500-ton extruder is used for extrusion deformation. The inner diameter of the extrusion cylinder is 85...

Embodiment 2

[0040] Put the ZM21 magnesium alloy billet into the heating furnace when the furnace temperature is less than 250°C, use the conventional heating rate to raise the temperature to 350°C with the furnace, and keep the constant temperature. The temperature of the furnace is raised to 430°C, and the constant temperature is maintained, and the billet is continuously subjected to the second-stage homogenization annealing at the constant temperature for 5 hours. The temperature rise rate from the first stage to the second stage with the furnace temperature rise can be ignored because of the basis of the homogenization annealing in the first stage.

[0041] After the billet is annealed, it is air-cooled and then loaded into the extruder for hot extrusion deformation.

[0042] Extrusion section shape as image 3 For the profile shown in the profile, a 2,500-ton extruder is used for extrusion deformation. The inner diameter of the extrusion cylinder is 200 mm, and the extrusion ratio i...

Embodiment 3

[0044]The AZ61 magnesium alloy blank is loaded into the heating furnace when the furnace temperature is <250°C, and the blank is loaded into the heating furnace when the furnace temperature is <250°C. The conventional heating rate is used to raise the temperature to 300°C with the furnace, and the constant temperature is maintained. The blank is heated at a constant temperature. The first stage of homogenization annealing for 6 hours, and then the temperature of the furnace is raised to 420°C, and the temperature is kept constant. The billet continues to perform the second stage of homogenization annealing at constant temperature for 5 hours. The temperature rise rate from the first stage to the second stage with the furnace temperature rise can be ignored because of the basis of the homogenization annealing in the first stage.

[0045] After the billet is annealed, it is air-cooled and then loaded into the extruder for hot extrusion deformation.

[0046] When extruding a bar ...

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Abstract

The invention discloses a hot extrusion production process for improving the plasticity of magnesium alloy profiles. The homogenization annealing treatment of the process is carried out in two stages. 350°C, the billet is subjected to the first-stage homogenization annealing at constant temperature for 4-8 hours, and then the second-stage homogenization annealing is carried out at 420-480°C for 2-6 hours; the maximum limit temperature of the hot extrusion deformation is controlled at Within the temperature value K=(0.85~0.87)Tm, the extrusion ratio is controlled in the range of ratio λ=(15~55)×(1-G / 100). It adopts two-stage homogenization treatment to solve the problem of excessive local temperature caused in the hot extrusion production process of magnesium alloy, resulting in non-equilibrium low melting point eutectic melting, affecting the processing and mechanical properties of the product, especially the problem of destroying its plasticity , can improve the plasticity of magnesium alloy profiles.

Description

technical field [0001] The invention relates to the field of extrusion processing of metal materials, in particular to a hot extrusion production process for improving the plasticity of magnesium alloy profiles. Background technique [0002] Magnesium alloy is currently the lightest metal structure material and has been widely used in aviation, aerospace, automobile and electronics industries. Deformed magnesium alloy products produced by extrusion, forging, rolling and other processes have higher strength, better ductility, and more diverse mechanical properties than cast magnesium alloy products, which can meet the needs of more structural materials. Demand, wrought magnesium alloys have become an important direction for the development of the world's magnesium industry. [0003] The production of wrought magnesium alloy products is difficult because the plastic deformation ability of magnesium alloy is insufficient compared with other materials such as aluminum and iron....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/02B21C31/00B21C23/01C21D1/26C21D11/00
Inventor 潘复生彭建丁培道汪凌云
Owner CHONGQING UNIV
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