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Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip

A magnesium alloy plate and processing method technology, applied in the direction of metal rolling, etc., can solve the problems of small pass reduction, limited processing deformation, and high plate preparation cost, achieve controllable grain size, and weaken basal surface texture. , the effect of improving mechanical properties

Inactive Publication Date: 2016-01-13
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the close-packed hexagonal crystal structure of pure magnesium and its alloys, and the c / a axis ratio is close to 1.63, at lower temperatures (temperature lower than 498K), it is mainly Slip start, few independent slip systems, plastic deformation around room temperature is mainly coordinated by twins, poor plastic deformation ability
Traditionally rolled magnesium alloy sheets have small reductions in each pass, are prone to edge cracking, and have a low yield. Frequent intermediate annealing is required between passes, and the cost of sheet preparation is relatively high.
At the same time, the hot-rolled slab usually forms a strong basal texture, that is, the grain basal plane is parallel to the rolling surface of the sheet, resulting in a strong anisotropy of the finished sheet, which will greatly affect the subsequent processing deformation and application. limits

Method used

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  • Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip
  • Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip
  • Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip

Examples

Experimental program
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Effect test

Embodiment 1

[0032] AZ31 magnesium alloy hot-rolled slab, its macro-texture {0001} pole figure is as follows figure 1 shown. figure 1 The macroscopic pole figure shows that the hot-rolled slab has a strong basal texture, and the highest strength is 7.795. The AZ31 magnesium alloy hot-rolled slab with an initial thickness of 7mm was opened for continuous cooling and rolling. The rolling path was one-way synchronous rolling. The secondary reduction is about 5%; after the continuous rolling, carry out intermediate annealing at 350°C for 30 minutes, and then repeat the aforementioned continuous cooling and rolling until the thickness of the magnesium alloy sheet reaches the required size.

Embodiment 2

[0034] The macro-texture {0001} pole figure of AZ31 magnesium alloy hot-rolled slab with an initial thickness of 4 mm is as follows figure 1 shown. figure 1 The macroscopic pole figure shows that the hot-rolled slab has a strong basal texture, and the highest strength is 7.795. The AZ31 magnesium alloy hot-rolled slab is opened for continuous cooling and rolling. The rolling path is unidirectional asynchronous rolling (different speed ratio is 1.1-1.5), the starting rolling temperature is 350°C, and the number of continuous rolling is 2 passes. , the single-pass reduction is about 10%; after continuous rolling, intermediate annealing at 350°C is performed for 15 minutes, and then the aforementioned continuous cooling rolling is repeated until the thickness of the magnesium alloy sheet reaches the required size.

Embodiment 3

[0036] AZ31 magnesium alloy hot-rolled slabs with an initial thickness of 4 mm were subjected to continuous rolling with cooling, the rolling path was multi-directional rolling, and the rolling method was asynchronous rolling (different speed ratio 1.5), and the starting rolling temperature was 400 °C , the number of continuous rolling is 4 passes, and the reduction in a single pass is about 5%; after the continuous rolling, an intermediate annealing at 350°C is carried out, the annealing time is 15 minutes, and then the aforementioned continuous rolling at lower temperature is repeated to obtain the total reduction About 40% of the rolled plate is subjected to final annealing at 250°C×1h, 300°C×1h, and 350°C×1h.

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Abstract

The invention discloses a rolling machining method for improving the microstructure texture and the mechanical property of a magnesium alloy sheet strip. Cooling continuous rolling is carried out on a magnesium alloy cogging panel, wherein the rolling starting temperature ranges from 250 DEG C to 500 DEG C, the number of continuous rolling times is two to eight, and one-time rolling reduction ranges from 2% to 20%; 200 DEG C-450 DEG C intermediate annealing is carried out after continuous rolling, wherein the annealing time ranges from 1 min to 60 min; and then the cooling continuous rolling step is repeatedly executed until the thickness of a magnesium alloy sheet reaches the needed size. According to the rolling machining method, through a cooling continuous rolling technology, base face slippage, taper face slippage and twinborn and grain boundary slippage can be started at the same time in the rolling process of the magnesium alloy sheet strip; meanwhile, the continuous rolling process facilitates grain accumulation coordinated deflection, and the base face texture inclines and is weakened; and the grain size of the magnesium alloy sheet strip is controllable through combination of the annealing process, and the mechanical property of a magnesium alloy is obviously improved.

Description

technical field [0001] The invention relates to a processing method for improving the microstructure and mechanical properties of magnesium alloy plates and strips, in particular to a rolling processing method for improving the microstructure and mechanical properties of magnesium alloy plates and strips. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength, specific stiffness, good thermal conductivity, electrical conductivity, damping and shock absorption, electromagnetic shielding, and easy recycling. Heavy and other fields have a wide range of industrial application prospects. Rolling is an efficient and low-cost plastic processing method for producing sheet and strip of metal materials. Metal alloy plate and strip are not only plastic processed products, but also can be used as raw materials for secondary processing. Therefore, the development of low-cost, high-quality magnesium alloy pla...

Claims

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Application Information

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IPC IPC(8): B21B1/26
CPCB21B1/26
Inventor 朱涛
Owner GUIZHOU UNIV
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