Rough rolling process and method for preparing high-strength high-ductility magnesium alloy sheet

Abstract

The invention discloses a rough rolling process for preparing a high-strength high-ductility magnesium alloy sheet. In the rough rolling step, the rolling speed of each rolling pass is controlled to be 50-100 m / min, and the rolling reduction of each rolling pass is controlled to be 60%-90%. The invention further discloses a method for preparing the high-strength high-ductility magnesium alloy sheet. The method comprises the rough rolling process. According to the rough rolling process and method for preparing the high-strength high-ductility magnesium alloy sheet, the rolling speed is high, the rolling reduction is large, the average grain size of a magnesium alloy slab obtained after the rough rolling step is less than or equal to 20 microns, the magnesium alloy sheet manufactured after subsequent warm rolling is good in rolled plate shape, and in the case of the magnesium alloy sheet, the yield strength is larger than or equal to 220 MPa, the tensile strength is larger than or equalto 290 MPa, and the elongation percentage is larger than or equal to 15%.

Description

technical field [0001] The invention relates to a rough rolling process and method, in particular to a rough rolling process and method for preparing magnesium alloy thin plates. Background technique [0002] Magnesium alloy has a low density (1.8g / cm 3 ), high specific strength and high specific stiffness, and excellent physical properties (such as thermal conductivity, electromagnetic shielding performance, damping and shock absorption performance, and response characteristics to high-frequency range of sound), which are used in transportation industries such as automobiles and rail transit and home appliances. It has a good application prospect in many fields such as industry. [0003] At present, there are two main factors restricting the application and development of magnesium alloy sheets: first, magnesium alloys have a close-packed hexagonal crystal structure, few independent slip systems, and poor room temperature processability. It is generally believed that the p...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main factors restricting the application and development of magnesium alloy sheets: first, magnesium alloys have a close-packed hexagonal crystal structure, few independent slip systems, and poor room temperature processability. It is generally believed that the plasticity of magnesium alloys will increase with the strain rate. Therefore, the rolling speed usually used in rolling is less than 5m / min, which is far lower than the rolling speed of steel, aluminum, copper and other non-ferrous metals, which increases the production cost of magnesium alloy plates.

Second, considering the poor plasticity of magnesium alloy sheets, the production of magnesium alloy sheets in the prior art all adopts multi-pass and small reduction mode at high temperature (ie hot rolling). In the production process, it takes more than ten passes to roll the magnesium alloy plate

However, the process steps of this processing method are relatively complicated, and it is difficult to be widely used in actual production.

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