Edge-controlling rolling method for wide magnesium alloy plate

Abstract

The invention belongs to the field of machining of metal materials, and particularly relates to an edge-controlling rolling method for a wide magnesium alloy plate. In order to solve the problems of serious edge cracking, anisotropic protrusions and the like of an existing rolling process for the magnesium alloy plate, widening rolling and Mizushima automatic plan view pattern control system (MAS) rolling are recombined and optimized, and a method for determining the prefabricated convexity is given definitely specific to magnesium alloy materials. The convexity of the edge of a rolled piece is prefabricated before cross rolling and axial rolling, so that the flow amount of metal at the edge is improved, and the flaws of the head and the tail of a common rolled piece are compensated. Coordinate deformation of the edge and the middle of the rolled piece with low fracture toughness is achieved during rolling and deformation, and therefore edge cracking is relieved or eliminated, the rolling yield of the wide magnesium alloy plate is improved, and the cost is reduced. Meanwhile, orthogonal rolling is achieved in the axial-cross-axial rolling process, the anisotropic defect in the common rolling process is effectively relieved, and the performance of the materials is improved. By means of the edge-controlling rolling method for the wide magnesium alloy plate, the edge cracking and anisotropic defects during rolling of the wide magnesium alloy plate are effectively relieved or controlled, the yield and the performance of the materials are further improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a method for edge-controlled rolling of wide-width magnesium alloy plates. Background technique [0002] Abundant magnesium resources, remarkable lightweight effect, low energy consumption and easy recycling, and other excellent characteristics have achieved broad application prospects and an undoubted position in the field of future materials for magnesium alloys. However, its special HCP crystal structure results in less slip systems, poor plasticity, and low fracture toughness under low temperature conditions. Small size and fast heat dissipation. When magnesium alloys are rolled by traditional full longitudinal rolling, full transverse rolling, transverse-longitudinal rolling, and longitudinal-horizontal rolling, problems such as edge cracking and prominent anisotropy are still very easy to occur. It reduces the yield and mechanical properties of the prod...

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Problems solved by technology

[0003] The main reasons for the above defects are: the metal flow of the rolled piece follows the law of least resistance during the rolling process, and the metal in the middle area along the width direction of the rolled piece has greater resistance to flowing to both sides, so it mainly extends longitudinally along the rolling direction; and Because the metal at the edge of the rolled piece has less resistance to flowing to the edge, it also flows transversely to the edge while extending longitudinally, so that the longitudinal extension of the edge is smaller than that in the middle, and the edge of the rolled piece as a whole must be pulled. The effect of stress, for rolled pieces with good plasticity and high fracture toughness such as steel or aluminum alloy, the above-mentioned rolling method only appears "tongue"-shaped defects at the end of the rolled piece, while for magnesium alloy material, then Not only does the "tongue" shape defect appear at the end, but at the same time, due to the two-way deformation of the edge, the amount of deformation is large, but the plasticity is low, the metal flow is limited, the vacancies after deformation cannot be effectively replenished, and the fracture toughness of the magnesium alloy material is low. , so edge cracks will also appear under the action of tensile stress

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