Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip

A magnesium alloy plate and grain refinement technology, applied in the field of magnesium alloy processing, can solve problems such as low efficiency, high equipment requirements, and unfavorable costs, and achieve the effects of reasonable process design, high processing efficiency, and convenient operation

Inactive Publication Date: 2011-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many methods to achieve surface grain refinement, such as friction stir processing (FSP), high energy shot peening (HESP) and surface mechanical grind

Method used

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  • Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip
  • Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip
  • Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Bidirectional repeated bending of AZ31 magnesium alloy sheets was performed at 250 °C. First, place the AZ31 plate between a set of bending rolls, adjust the distance between the upper and lower sets of bending rolls h=1.8r, and the distance between the same set of bending rolls L=3.8r, so that the bending radius R of the strip and the plate thickness The ratio R / t of t is 9, and then the driving roller drives the strip to move in one direction once, so that the strip is bent and deformed when it passes through the bending roller. Repeat the above steps to control the deformation pass to 30 times. attached by figure 1 It can be seen that after two-way repeated bending, the surface grains of the plate are refined to less than 1 μm, and the integral fraction of fine crystals is as high as 90%.

Embodiment 2

[0027] Bidirectional repeated bending of AZ61 magnesium alloy sheets was performed at 350 °C. Firstly, place the AZ61 plate between a set of bending rolls, adjust the distance between the upper and lower sets of bending rolls h=1.8r, and the distance between the same set of bending rolls L=2.2r, so that the bending radius R of the strip and the plate thickness The ratio R / t of t is 6.5, and then the driving roller drives the strip to move in one direction once, so that the strip is bent and deformed when it passes through the bending roller. Repeat the above steps to control the deformation pass to 10 times. attached by figure 2 and 3 The microstructure observation and texture analysis show that after bidirectional repeated bending, the double surface grains of the plate are refined to less than 3 μm, and the thickness of the fine grain layer is 0.6-0.7 mm; the surface texture of the plate is obviously deflected, and most of the grains (0001 ) The base surface is turned to...

Embodiment 3

[0029] AZ61 magnesium alloy sheets were subjected to bidirectional repeated bending at 400 °C. First, place the AZ61 plate between two sets of bending rolls, adjust the distance h between the upper and lower sets of bending rolls to h=1.5r, and the distance between the same set of bending rolls to L=3r, so that the bending radius R of the strip and the plate thickness t The ratio R / t is 3, and then the driving roller drives the strip to move in one direction once, so that the strip is bent and deformed when it passes through the bending roller. Repeat the above steps to control the deformation pass to 6 times. attached by Figure 4 It can be seen that after deformation, the surface grains of the plate are refined to less than 15 μm.

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Abstract

The invention relates to a processing method for refining crystal grains and improving texture of double surface layers of a magnesium alloy plate strip. In the method, the magnesium alloy plate strip is arranged between at least two groups of bending rolls which are stacked up and down and staggered mutually at the temperature of between 250 and 400 DEG C; the magnesium alloy plate strip is driven to move towards one direction for at least one pass, and when passing through the bending rolls, the magnesium alloy plate strip are bent and deformed, so the magnesium alloy plate strip of which the crystal grains of the double surface layers are refined and the texture is improved is prepared. In the deformation process, large strain is accumulated on the upper and lower surface layers of the plate strip due to repeated stretching and compression, and dynamic recrystallization is induced at middle and high temperature, so that the crystal grains of the double surface layers of the plate strip are refined; and the surface layers are subjected to shear stress, so that a basal plane deflects to improve the original texture. In the method, a process design is reasonable, and equipment is simple and convenient to operate, can be matched with the conventional processing equipment for magnesium alloy, has high processing efficiency and can improve the rigidity and ductility of the double surface layers of the magnesium alloy plate strip effectively and improve the subsequent processing performance of the magnesium alloy plate strip; and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention discloses a processing method for grain refinement and texture improvement of a double surface layer of a magnesium alloy strip, belonging to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, good electromagnetic shielding effect, strong shock resistance and shock absorption ability, and easy recycling and reuse. It has broad application prospects in the fields of aviation, aerospace, automobiles, 3C products, and military industries. However, magnesium alloys belong to the close-packed hexagonal structure, and there is a strong plate texture in the rolled and extruded plates or strips. This texture is difficult to reduce and eliminate through annealing process and conventional deformation process. It is easy to produce various defects in it, which seriously limits its secondary deformation ability. In order to...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 杨续跃姜育培
Owner CENT SOUTH UNIV
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