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Severe plastic deformation technology of magnesium alloy board

A large plastic deformation, magnesium alloy technology, applied in the direction of metal rolling, can solve the problems of many processes, low efficiency, high cost, etc., and achieve the effect of simple process, high strength and high production efficiency

Active Publication Date: 2013-09-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the prior art, in the rolling process of magnesium alloy sheet, multi-pass rolling is required at high temperature and small downforce, which has many procedures, high cost and low efficiency.

Method used

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  • Severe plastic deformation technology of magnesium alloy board
  • Severe plastic deformation technology of magnesium alloy board
  • Severe plastic deformation technology of magnesium alloy board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Magnesium alloy sheet preparation: first prepare the sheet for electro-induced asynchronous stack rolling, pre-cutting and then reserve.

[0021] 2) Homogenize the plate with a heating rate of 5°C / min, a heating temperature of 400°C, a holding time of 40min, and cooling with the furnace.

[0022] 3) Milling the surface of the homogenized magnesium alloy plate, the milling process requires high-speed milling, the milling cutter speed is greater than 2800r / min, and the surface roughness is lower than Ra6.3μm.

[0023] 4) Ultrasonic cleaning is performed on the plate treated in step 3). Clean with acetone to remove impurities and oil.

[0024] 5) Wrap the two pieces of magnesium alloy plates after the above operations with pure aluminum foil, and age at room temperature.

[0025] 6) The voltage applied on both sides of the plate is 110V, the pulse width of the high-energy electric pulse is 60μs, and the length of the electrified treatment area is about 300mm. Start t...

Embodiment 2

[0029] It is basically the same as Embodiment 1, the difference is that:

[0030] The process parameters of the homogenization treatment in step 2) are heating rate 8°C / min, heating temperature 420°C, holding time 50min, and cooling with the furnace.

[0031] Step 3) The speed of medium and high-speed milling is 2900r / min, and the surface roughness is Ra3.2μm.

[0032]Step 5) Wrap the three magnesium alloy plates after the above operations with pure aluminum foil, and preheat in a resistance furnace at a heating temperature of 200°C and a holding time of 3-8 minutes.

[0033] Step 6) Take out the plate in step 5), the voltage applied on both sides is 115V, the pulse width of the high-energy electric pulse is 70μs, the length of the electrified treatment area is about 250mm, the speed of the upper and middle rolls is 1.5m / min, and the speed of the lower roll is 0.8m / min. The rolling process was completed at 200°C in one pass, with a 45% downforce and a sheet strain rate of 1...

Embodiment 3

[0037] It is basically the same as Embodiment 1, the difference is that:

[0038] The process parameters of the homogenization treatment in step 2) are heating rate 10°C / min, heating temperature 440°C, holding time 60min, and cooling with the furnace.

[0039] Step 3) The speed of medium and high speed milling is 3000r / min, and the surface roughness is Ra3.2μm.

[0040] Step 5) Wrap the four magnesium alloy plates after the above operations with pure aluminum foil, and preheat in a resistance furnace at a heating temperature of 300°C and a holding time of 3-8 minutes.

[0041] Step 6) Take out the plate in step 5) and apply a voltage of 115V on both sides, a pulse width of high-energy electric pulse of 80μs, a length of energized treatment area of ​​about 250mm, a speed of upper and middle rolls of 2m / min, and a speed of lower rolls of 1.2m / min. min. The rolling process was completed at 300°C in one pass, with a 40% downforce and a sheet strain rate of 1.8 s-1.

[0042] Ste...

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Abstract

The invention relates to a severe plastic deformation technology of a magnesium alloy board. The technology comprises the following steps of: pretreating the magnesium alloy board; carrying out homogenization treatment on the magnesium alloy board; carrying out surface finishing on the magnesium alloy board; cleaning the magnesium alloy board; preheating the magnesium alloy board; carrying out pack rolling deformation on the magnesium alloy board; putting the magnesium alloy board into a rolling mill, and carrying out asynchronous pack rolling deformation on the magnesium alloy board; and carrying out annealing treatment on the magnesium alloy board. The magnesium alloy board processed by the technology has the advantages of being simple in technology, high in production efficiency, good in mechanical property and good in product quality.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a process for large plastic deformation of magnesium alloy plates. Background technique [0002] Magnesium alloy is light in weight (ρ=1.74×103kg / m3, only 2 / 3 of aluminum), high specific strength (σ / ρ=120, 3-4 times that of iron), and is widely used in aerospace, machinery, electronics, automobiles, etc. It has been widely used in the industrial field. However, cast magnesium alloy has low strength at room temperature and low temperature, poor plastic deformation ability, and unsatisfactory corrosion resistance, which limits its wide application. Compared with cast magnesium alloys, wrought magnesium alloys have higher strength, better ductility, and more diverse mechanical properties, as shown in Supplementary Table 1. [0003] However, since magnesium belongs to the close-packed hexagonal structure, only The basal surface slips and the mechanical twin starts, and th...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22F3/00B21B3/00
Inventor 王守仁薛广记宋令慧韩莹
Owner UNIV OF JINAN
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