Method for restraining edge cracking of magnesium alloy plate through longitudinal wrinkling

Abstract

The invention belongs to the field of magnesium alloy preparation processes, and particularly relates to a method for restraining edge cracking of a magnesium alloy plate through longitudinal wrinkling. The method comprises the following steps that the AZ31B magnesium alloy plate undergoes heat preservation for 15 minutes at 380 DEG C, firstly, the first pass of rolling on the AZ31B magnesium alloy plate is performed by using transverse-wave corrugated rollers, a relatively large deformation amount is set here, crystal grains of the magnesium alloy plate are fully crushed, moreover, an extremely-strong base surface texture generated by large deformation of rolling is effectively avoided, and the subsequent rolling ability of the plate is improved; and after the magnesium alloy plate returns to a further again to be heated, the second pass of rolling on the AZ31B magnesium alloy plate is performed by using flat rollers, and finally the magnesium alloy plate with less edge cracks can beprepared. The method has the advantages that the application range is wide, the process is simple and easy to control, the cost is low, the generation of the edge tensile stress of the magnesium alloyplate is weakened or inhibited in the macro view, the base surface texture is weakened in the micro view, and the rolling forming property of the magnesium alloy plate is improved.

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 longitudinal wrinkling. Background technique [0002] Magnesium alloy is the lightest metal structural material in practical application. Its mass is generally 30%-50% lighter than aluminum alloy and more than 70% lighter than steel. It also has high specific strength and specific stiffness, large elastic modulus, and biophase With the advantages of good capacitance, 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 "21st century green engineering metal structure Material". [0003] Rolling is one of the main methods of producing magnesium alloy sheets, which can flexibly produce sheets ...

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Problems solved by technology

[0005] After searching the existing technology, it is found that there are mainly the following production processes for suppressing the edge cracking of magnesium alloy plates: Chinese patent "Multiple, Small, High-Strength Plastic Magnesium Alloy and Its Short-process Preparation Method with Large Reduction" with publication number CN109504884A And publication number is the Chinese patent of CN107964602A " effective method for improving the plastic formability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy ", both start to slow down or eliminate the edge crack of magnesium alloy sheet material from raw material, but technology is relatively Complicated; the Chinese patent "A Roller and Rolling Method for Magnesium Alloy Cross-Rolling and Its Rolling Method" with publication number CN109332389A records that cross-rolling can effectively solve the problem of edge cracking in magnesium alloy plate rolling, but its plate specifications are limited; The Chinese patent with the publication number CN104889160A "A Method and Device for Multi-directional Pre-deformation Rolling of Wide Magnesium Alloy Thick Plate Edges" adopts the combination of front vertical roll / slanted roll + flat roll + rear skewed roll / vertical roll combination synchronous rolling Manufacturing technology can reduce the occurrence and expansion of edge cracks and improve the yield of magnesium alloy sheets, but the limitations of its equipment make it difficult to apply on a large scale

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