Preparation technology for large size super-high obdurability magnesium alloy thin plate

A preparation process and technology of magnesium alloys, applied in the field of metal rolling, can solve the problems of insufficient grain structure, unable to meet performance requirements, low mechanical properties, etc., to improve the structure, solve poor plastic deformation, and ensure formability. Effect

Active Publication Date: 2017-03-22
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in domestic industrial applications, the magnesium alloy sheet is mostly prepared by a single cold rolling or hot rolling method, the grain structure is not fine enough, the mechanical properties are low, and it cannot meet the performance requirements of aerospace, military weaponry and other fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The selected magnesium alloy ingot has a specification of Ф65mm and a length of 240mm.

[0023] First, homogenize the magnesium alloy billet, heat the billet to 400°C for 2 hours; then, perform equal-channel angular extrusion on the homogenized magnesium alloy billet, wherein the extrusion temperature is 450°C, and the equal-channel in the mold The rotation angle is 90°, the extrusion path is the Bc path, and annealed at 350°C for 30 minutes after every 1 to 2 extrusion passes, and after 8 extrusion passes, a magnesium alloy rod with a specification of Ф20mm and a length of 420mm is obtained; Heat the roll to 350°C; heat the magnesium alloy bar to 450°C for 30 minutes, and then roll it. During the rolling process, the roll is kept warm, the rolling speed is controlled at 0.35m / s, and the rolling reduction per pass is 8% to 16%, after each pass, anneal at 400°C for 20 minutes, cycle, and after 16 passes of rolling, a magnesium alloy sheet with a thickness of 1mm and a de...

Embodiment 2

[0026] The selected magnesium alloy ingot has a specification of Ф86mm and a length of 280mm.

[0027] First, homogenize the magnesium alloy billet, heat the billet to 350°C for 3 hours; then, carry out equal-channel angular extrusion on the homogenized magnesium alloy billet, wherein the extrusion temperature is 450°C, and the equal-channel in the mold The rotation angle is 60°, the extrusion path is A path, and annealed at 400°C for 20 minutes after every 1 to 2 extrusion passes, and after 8 extrusion passes, a magnesium alloy rod with a specification of Ф60mm and a length of 450mm is obtained; Heat the roll to 400°C; heat the magnesium alloy bar to 400°C and keep it warm for 40 minutes before rolling. During the rolling process, the roll is kept warm, the rolling speed is controlled at 0.3m / s, and the rolling reduction per pass is 8% to 16%, after each pass, anneal at 370°C for 30 minutes, cycle, and after 12 passes of rolling, a magnesium alloy sheet with a thickness of 6m...

Embodiment 3

[0030] The selected magnesium alloy ingot has a specification of Ф71mm and a length of 205mm.

[0031] First, homogenize the magnesium alloy billet, heat the billet to 450°C for 2 hours; then, perform equal-channel angular extrusion on the homogenized magnesium alloy billet, wherein the extrusion temperature is 370°C, and the equal-channel in the mold The rotation angle is 30°, and the extrusion path is B C The route is to anneal at 400°C for 30 minutes after every 1 to 2 extrusion passes, and obtain a magnesium alloy rod with a specification of Ф40mm and a length of 480mm after extrusion for 8 passes; heat the roll to 450°C; place the magnesium alloy rod After the material is heated to 450°C and kept for 60 minutes, rolling is carried out. During the rolling process, the rolls are kept warm, the rolling speed is controlled at 0.4m / s, and the rolling reduction of each pass is 8% to 16%. Annealed at 370°C for 40 minutes, cycled, and rolled through 12 passes, finally a magnesiu...

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Abstract

The invention relates to the preparation technology for a large size super-high obdurability magnesium alloy thin plate. The preparation technology particularly comprises the following steps that firstly, a magnesium alloy blank is heated to 250-450 DEG C and subjected to heat preservation for 1-3 h; then, the magnesium alloy blank is subjected to equal-channel angular pressing, after being extruded for one to two passes, the magnesium alloy blank is remelted and annealed, pressing is conducted for 8-12 times, and then a magnesium alloy rod material is obtained; before a rolling mill conducts rolling, a roller is preheated, the preheating temperature is 150-450 DEG C, and the roller is subjected to heat preservation treatment in the rolling process; after the obtained magnesium alloy rod material is subjected to heat preservation for 20-60 min at the temperature of 250-450 DEG C, the magnesium alloy rod material is rolled by adopting a multi-pass and small-deformation method, and the speed of the roller is 0.2-0.5 m/s; after every pass of rolling, remelting and annealing are conducted, horizontal rolling and vertical rolling are alternately conducted in the rolling process, and a magnesium alloy thin plate is obtained; and the obtained magnesium alloy thin plate is subjected to aging treatment, and then a finished magnesium alloy thin plate is obtained. According to the preparation technology of the large size super-high obdurability magnesium alloy thin plate, the prepared magnesium alloy thin plate is uniform in crystalline grain and excellent in mechanical property.

Description

technical field [0001] The invention belongs to the field of metal rolling, and in particular relates to a preparation process of a large-size ultra-high-strength and toughness magnesium alloy sheet. Background technique [0002] Magnesium alloy is a light-weight structural material, which has the advantages of light weight, high specific strength, good specific stiffness, easy cutting and processing, good thermal and electrical conductivity, good electromagnetic shielding performance, damping and vibration reduction performance, and low processing cost. , is an ideal material for components such as aerospace, weaponry, automobiles, and 3C products, making the research on the rolling process of magnesium alloy sheets an important topic in the field of material processing. The magnesium alloy sheet rolling process usually encounters two problems. One is that the magnesium alloy belongs to the hexagonal close-packed crystal (hcp) structure, and its slip system is relatively sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/00B21C37/02
CPCB21C37/02C22C23/00C22F1/06
Inventor 李轶肖宏超熊雯瑛
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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