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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AI-Extracted Technical Summary

Problems solved by technology

Therefore, in the prior art, in the rolling process of magnesium alloy sheet, multi-pass rolling is req...

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Method used

A kind of technique that is used for the large plastic deformation of high-quality magnesium alloy sheet material, this technique is that electroplastic processing, asynchronous rolling and cumulative stack rolling technology are compounded on the basis of repeated tests, and optimal A new electro-induced deformation technology for asynchronous rolling of magnesium alloy sheets formed by different parameter values. Among them, electroplastic processing (EPR) technology uses high-density pulse current to increase the kinetic energy of atoms inside the material, change the activation energy of dislocations, accelerate the movement speed of moving dislocations, and open the entanglement between dislocations, thereby overcoming the friction on the slip surface. Obstacles, greatly improving the metal plasticity. The asynchronous stack rolling (ARB) technology is a process in which the multi-layer plates are superimposed and rolled together by using the different circumferential speeds of the two work rolls. The electro-induced asynchronous rolling deformation technology for magnesium alloy plates prevents rolling cracks and ensures the quality of rolled products through reasonable matching of rolling process parameters.

Above-mentioned technological method has synthesized each advantage of e...

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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.

Application Domain

Metal rolling arrangements

Technology Topic

Surface finishingMagnesium alloy +4

Image

Examples

Experimental program(4)

Example Embodiment

[0019] Example one:

[0020] 1) Magnesium alloy sheet preparation: First, prepare the sheet for electro-induced asynchronous stack rolling, and prepare it for use after pre-cutting.

[0021] 2) Homogenizing the plate, heating speed 5℃/min, heating temperature 400℃, holding time 40min, cooling with furnace.

[0022] 3) The homogenized magnesium alloy sheet surface is milled. The milling process requires high-speed milling, the milling cutter speed is greater than 2800r/min, and the surface roughness is less than Ra6.3μm.

[0023] 4) Carry out ultrasonic cleaning on the board processed in step 3). Acetone is used as cleaning fluid to remove impurities and oil stains.

[0024] 5) Wrap the two magnesium alloy plates after the above operation 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 the rolling mill and adjust the speed of the upper and lower rolls, the upper roll speed is 1.2m/min, and the lower roll speed is 0.5m/min. The rolling process is completed at room temperature and within one pass, using a 40% reduction, and the plate strain rate is 1s-1.

[0026] 7) Anneal the magnesium alloy sheet treated with the above steps at a heating rate of 8°C/min, a heating temperature of 250°C, and a holding time of 20 minutes, followed by cooling with the furnace.

[0027] See Attached Table 3 for the mechanical properties of the magnesium alloy sheet rolled in Example 1.

Example Embodiment

[0028] Embodiment two:

[0029] It is basically the same as the first embodiment, and the difference lies in:

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

[0031] Step 3) The speed of the 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 them 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 applied voltage 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 upper and middle roll speed is 1.5m/min, and the lower roll speed is 0.8m. /min. The rolling process is completed at 200°C and within one pass, with a 45% reduction and a plate strain rate of 1.5s-1.

[0034] Step 7) Annealing the magnesium alloy sheet treated by the above steps, the heating rate is 10°C/min, the heating temperature is 300°C, the holding time is 30 minutes, and the furnace is cooled.

[0035] The mechanical properties of the magnesium alloy sheet rolled in Example 2 are shown in Table 3.

Example Embodiment

[0036] Embodiment three:

[0037] It is basically the same as the first embodiment, and the difference lies in:

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

[0039] Step 3) The rotational 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 them 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). The applied voltage on both sides is 115V, the pulse width of the high-energy electric pulse is 80μs, the length of the electrified treatment area is about 250mm, the middle and upper roll speed is 2m/min, and the lower roll speed is 1.2m/ min. The rolling process is completed at 300°C and within one pass, using a 40% reduction, and the plate strain rate is 1.8s-1.

[0042] Step 7) Annealing the magnesium alloy sheet treated by the above steps, the heating rate is 10°C/min, the heating temperature is 350°C, the holding time is 30 minutes, and the furnace is cooled.

[0043] The mechanical properties of the magnesium alloy sheet rolled in Example 3 are shown in Table 3.

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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

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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