Method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing

A technology of crisscross and magnesium alloy, applied in the field of asynchronous crisscross rolling of AZ31 magnesium alloy, can solve the problems of poor performance, insufficient strength and elongation of AZ31 alloy, improve mechanical properties, optimize microstructure, and refine grains Effect

Inactive Publication Date: 2009-11-04
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After searching the literature of the prior art, it was found that Liu Xing, Chen Zhenhua, etc. published "The Influence of Asynchronous Rolling on the Microstructure and Properties of AZ31 Magnesium Alloy Sheet" in "Thermal Processing Technology" (Volume 35, No. 20, 2006). In this paper, the AZ31 alloy produced by asynchronous rolling method at 400°C has a strength and elongation of 255 MPa and 17.4%. Except for fine grains less than 10 μm, most of them are coarse grains with larger sizes, and some grains even reach 60 μm, which has poor performance

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  • Method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing
  • Method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing
  • Method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: comparative example

[0022] The alloy is rolled by a two-roll asynchronous rolling mill, wherein: the roll temperature is set to room temperature, the rolling temperature is set to 400°C, the speed ratio of the upper and lower rolls is set to 1.0, and the number of passes is set to 4;

[0023] Mark the direction of the first rolling schedule on the alloy to be rolled as X in turn, and rotate 90°, 180° and 270° counterclockwise with the X direction to be the Y direction, -X direction and -Y direction respectively, and then carry out first rolling;

[0024] The given magnesium alloy material is a conventional extruded AZ31 alloy, the average grain size of the crystal obtained after rolling is 10μm, and the mechanical properties are: elongation 11.13%, yield strength 255.05MPa, and tensile strength 301.64MPa.

Embodiment 2

[0026] The first step is to use a two-roll asynchronous rolling mill to roll the alloy, wherein: the roll temperature is set to room temperature, the rolling temperature is set to 400°C, the speed ratio of the upper and lower rolls is set to 1.0, and the number of passes is set to 4;

[0027] Mark the direction of the first rolling schedule on the alloy to be rolled as X in turn, and rotate 90°, 180° and 270° counterclockwise with the X direction to be the Y direction, -X direction and -Y direction respectively, and then carry out first rolling;

[0028] In the second step, the rolling direction of the alloy after the first rolling is set to be rolled 3 times in the Y direction, the X direction and the Y direction successively, wherein: the roll temperature is set to room temperature, and the rolling temperature is set to 400°C, the speed ratio of the upper and lower rolls is set to 1.0, the number of passes is set to 4, and the rolling process is completed.

[0029] The give...

Embodiment 3

[0031] The first step is to use a two-roll asynchronous rolling mill to roll the alloy, wherein: the roll temperature is set to room temperature, the rolling temperature is set to 400°C, the speed ratio of the upper and lower rolls is set to 1.0, and the number of passes is set to 4;

[0032] Mark the direction of the first rolling schedule on the alloy to be rolled as X in turn, and rotate 90°, 180° and 270° counterclockwise with the X direction to be the Y direction, -X direction and -Y direction respectively, and then carry out first rolling;

[0033] In the second step, the rolling direction of the alloy after the first rolling is set to be rolled 3 times in the Y direction, the X direction and the Y direction successively, wherein: the roll temperature is set to room temperature, and the rolling temperature is set to 400°C, the speed ratio of the upper and lower rolls is set to 1.4, the number of passes is set to 4, and the rolling process is completed.

[0034] The give...

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Abstract

The invention relates to a method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing, which belongs to the technical field of metal rolling. The method is characterized by comprising the following steps: calibrating an alloy to be rolled; rolling the alloy for the first time by a dual-roller asynchronous rolling mill; and rolling the alloy for the second time after the alloy is rolled for the first time. The average size of the crystalline grain of the AZ31 alloy rolled by the method is 10 microns, and the mechanical properties of the alloy after optimal rolling can reach that the extensibility is 16.73 percent, the yield strength is 249.2 MPa, and the tensile strength is 319.46 MPa.

Description

technical field [0001] The invention relates to a rolling method in the technical field of metal processing, in particular to an AZ31 magnesium alloy asynchronous cross rolling method. Background technique [0002] In order to prepare various ultrafine-grained metal materials, various deep plastic deformation methods have been invented. The so-called deep plastic deformation method is a variety of processing methods for preparing ultra-fine-grained bulk materials by causing deep plastic deformation of materials. It was developed in the 1930s and 1940s for the preparation of ultra-fine-grained materials with superplastic deformation capabilities. With the extensive research of ultra-fine-grained metal bulk materials in the world in recent years, deep plastic deformation technology has gradually been used by countries represented by Russia and Japan to develop ultra-fine-grained metal blocks. body material. The current deep plastic deformation methods include equal channel a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/00
Inventor 林凌陈彬曾小勤丁文江
Owner SHANGHAI JIAO TONG UNIV
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