A Method for Inhibiting Edge Cracks of Magnesium Alloy Sheets by Transverse Wrinkling

Abstract

The invention belongs to the field of magnesium alloy preparation technology, and in particular relates to a method for suppressing edge cracking of magnesium alloy plates by transverse wrinkling. Insulate the magnesium alloy sheet at 400°C for 15 minutes, first use the longitudinal wave corrugated roll to carry out the first rolling of the magnesium alloy sheet, set a large amount of deformation here, fully break the grains of the magnesium alloy sheet, and effectively avoid rolling The extremely strong base surface texture produced by large deformation improves the subsequent rollability of the plate. After returning to the furnace for heating, the flat rolls are used to carry out the second rolling of the magnesium alloy sheet, and finally the magnesium alloy sheet with less edge cracks can be prepared. The invention has wide application range, simple process and easy control, and low cost. Macroscopically, it weakens or suppresses the generation of tensile stress at the edge of the magnesium alloy plate; microscopically, it weakens the texture of the base surface and improves its rolling formability.

Description

technical field [0001] The invention belongs to the field of magnesium alloy preparation technology, and in particular relates to a method for suppressing edge cracking of magnesium alloy plates by transverse wrinkling. Background technique [0002] Magnesium alloy is the lightest metal structural material in practical application. Its density is about 1 / 4 of that of iron and 2 / 3 of that of aluminum. It also has high specific strength and specific stiffness, large elastic modulus, and good biocompatibility. With the advantages of good thermal and electrical conductivity, strong electromagnetic shielding ability and good damping and shock absorption performance, it is widely used in aerospace, transportation, national defense and military industry, equipment manufacturing and 3C electronics, etc., and is known as "the most developed in the 21st century Promising green engineering materials". [0003] Rolling is one of the main methods of producing magnesium alloy sheets, whi...

AI Technical Summary

Problems solved by technology

[0004] After searching the prior art, it is found that at present there are mainly the following production processes for suppressing edge cracking of magnesium alloy plates: the Chinese patent "Rolling Method of Magnesium Alloy Covered by Aluminum Plate" with the publication number CN102909217A and the publication number CN105170660A The Chinese patent "A Method for Edge-Controlled Rolling of Wide-width Magnesium Alloy Sheets" both start from raw materials to slow down or eliminate the edge cracking of magnesium alloy sheets, but the process is relatively complicated; the Chinese patent "A Magnesium Alloy with Publication No. CN103962376A "Large reduction rolling method" records that lining plate rolling can effectively solve the problem of rolling edge cracks of magnesium alloy plates, but its plate specifications are limited; the Chinese patent "A Wide Magnesium Alloy Thick Plate" with publication number CN104889160A Edge multi-directional pre-deformation rolling method and device", using front vertical roll / slanted roll combination + flat roll + rear skewed roll / vertical roll combination synchronous rolling technology to reduce the generation and expansion of edge cracks and improve the strength of magnesium alloy plates Yield, but the limitations of its equipment make it difficult to apply on a large scale

In addition, technologies such as cross rolling and asynchronous rolling have a significant effect on the grain refinement of magnesium alloy sheets, but the rolled sheets still have problems such as serious edge cracks and prominent anisotropy.

Images