CN103276328A - Severe plastic deformation technology of magnesium alloy board - Google Patents
Severe plastic deformation technology of magnesium alloy board Download PDFInfo
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- CN103276328A CN103276328A CN2013102094278A CN201310209427A CN103276328A CN 103276328 A CN103276328 A CN 103276328A CN 2013102094278 A CN2013102094278 A CN 2013102094278A CN 201310209427 A CN201310209427 A CN 201310209427A CN 103276328 A CN103276328 A CN 103276328A
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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
The present invention relates to metallic substance and love and respect worker's technical field, especially relate to a kind of magnesium alloy plate large plastometric set technology.
Background technology
Magnesium alloy in light weight (ρ=1.74 * 103kg/m3, only be aluminium 2/3), specific tenacity height (σ/ρ=120, be the 3-4 of iron doubly), obtained widespread use at industrial circles such as space flight, machinery, electronics, automobiles.But cast magnesium alloys room temperature, low temperature intensity are low, and plastic deformation ability is poor, and corrosion resistance is undesirable, has limited its widespread use.Compare with cast magnesium alloys, wrought magnesium alloys has higher intensity, better ductility, and more diversified mechanical property is shown in subordinate list 1.
Yet, because magnesium belongs to close-packed hexagonal structure, have only under the room temperature during distortion
Basal slip with the twin startup of machinery, deformability is relatively poor.Though and under the high temperature
The cylinder slippage and
Conical surface sliding system can both start, and can satisfy the Taylor criterion requirement of needed 5 the independent sliding systems of distortion, but conical surface slip system＜c+a〉the Bai Shi vector is big, and spacing is little, and dislocation core is narrow, and slippage is difficult for taking place.Therefore, prior art need be carried out the rolling of multi-pass under high temperature and little volume under pressure in the magnesium alloy plate operation of rolling, and operation is many, the cost height, and efficient is low.
Summary of the invention
The objective of the invention is to overcome the shortcoming that exists in the prior art, a kind of magnesium alloy plate large plastometric set technology is provided, this process using electricity causes induces dislocation moving, by Pulse Electric Current with High Density inner atomic motion energy is raise, change the dislocation intensity of activation, accelerate motion dislocation motion speed, open between dislocation and tangle, thereby overcome the obstacle on the slip plane, improved Plastic Deformation greatly; This technology is also with many plate stacks, and simultaneously rolling, it is poor to produce micro-displacement between plate and plate, and basal plane texture is verted, and starts basal slip simultaneously, improves plasticity; This technology also adopts the top and bottom rolls friction-motion speed, allows two faces of each sheet material produce velocity contrast, and basal plane texture is verted, and increases shear-stress, and reduction basal plane texture is come crystal grain thinning, thereby further improves its plasticity.The technical scheme that adopts is: a kind of magnesium alloy plate large plastometric set technology, and this technology may further comprise the steps: the pre-treatment of magnesium alloy plate: standby after magnesium alloy plate is handled through pre-machining; The homogenizing of magnesium alloy plate is handled: magnesium alloy plate is put into process furnace, heat-up rate 5-11 ℃/min, be heated to 400-450 ℃, insulation 40-70min, this sheet material furnace cooling after finishing; The surface finishing of magnesium alloy plate: require the plate surface roughness to be lower than Ra6.3 μ m after the precision work; The cleaning of magnesium alloy plate; Preheating of magnesium alloy plate: two above magnesium alloy plates are coated with the fine aluminium paillon foil, put into resistance furnace and preheat,, thermal treatment temp is 200-350 ℃, soaking time is 3-8min; The ply rolling distortion of magnesium alloy plate: the sheet material of magnesium alloy is put into milling train, make magnesium alloy plate carry out asynchronous method ply rolling distortion; The anneal of magnesium alloy plate: magnesium alloy plate is carried out anneal according to following requirement: heat-up rate 8-18 ℃/min, Heating temperature 250-350 ℃, soaking time 20-40min, furnace cooling after finishing.
Technical scheme of the present invention also has: a kind of magnesium alloy plate large plastometric set technology, and this technology may further comprise the steps: the pre-treatment of magnesium alloy plate: standby after magnesium alloy plate is handled through pre-machining; The homogenizing of magnesium alloy plate is handled: magnesium alloy plate is put into process furnace, heat-up rate 5-11 ℃/min, be heated to 400-450 ℃, insulation 40-70min, this sheet material furnace cooling after finishing; The surface finishing of magnesium alloy plate: require the plate surface roughness to be lower than Ra6.3 μ m after the precision work; The cleaning of magnesium alloy plate; The ply rolling distortion of magnesium alloy plate: the sheet material of magnesium alloy is put into milling train, make magnesium alloy plate carry out asynchronous method ply rolling distortion; The anneal of magnesium alloy plate: magnesium alloy plate is carried out anneal according to following requirement: heat-up rate 8-18 ℃/min, Heating temperature 250-350 ℃, soaking time 20-40min, furnace cooling after finishing.
Technical characterictic of the present invention also has: the cleaning of described magnesium alloy plate is that magnesium alloy plate is placed acetone solution, uses ultrasonic cleaning to remove plate surface impurity and greasy dirt.
Technical characterictic of the present invention also has: described asynchronous method ply rolling distortion refers to that the magnesium alloy plate more than two that will be coated in the fine aluminium thin slice is placed in the roll of milling train, and described roll comprises topping roll and bottom roll, and upper and lower roll has different working speeds.
Technical characterictic of the present invention also has: described topping roll speed is between 1.2-2.5m/min, and bottom roll speed is between 0.5-1.4m/min.
Technical characterictic of the present invention also has: the voltage that is applied to the sheet material both sides in the ply rolling distortion of described magnesium alloy plate is 110-150V, and the pulsewidth of high energy electric pulse is 60-100 μ s, powers up treatment zone length and is about 200-400mm.
Technical characterictic of the present invention also has: the rolling of magnesium alloy finished in a passage in the ply rolling distortion of described magnesium alloy plate, has big volume under pressure 40-60%, sheet material strain rate: 1-2.5s
-1
Beneficial effect of the present invention is: 1) the invention provides a kind of realization magnesium alloy plate large plastometric set technology, this technology is that the electricity under current collection plastic working, asymmetrical rolling and the effect of accumulation ply rolling technology synergy causes the asynchronous ply rolling technology (EPR-ARB) of inducing, this EPR-ARB compounding technology has been realized the function iteration, parameter matching, the organic combination of power level coupling, utilize this technology that magnesium alloy is rolled distortion, its resistance to deformation reduces about 27-35%.
2), cause the magnesium alloy plate of inducing asynchronous ply rolling distortion through electricity, under the synergy of refined crystalline strengthening, working hardening and dislocations strengthening, common rolling raising 26% under the strength ratio electricity plastic effect, improve about 15% than simple asymmetrical rolling method, improve about 11% than single accumulation ply rolling technology, need to arrange heat treated shortcoming between multi-pass and passage thereby overcome traditional rolling technology, improved production efficiency and quality greatly.
3) magnesium alloy plate that forms of this processes not only in light weight, intensity is high, wear resistance and good heat resistance, damping property are good, machining and good dimension stability, and can satisfy telecommunications, communications and transportation, space flight and national defence field to the low cost of its member, short flow process, highly reliable preparation technology's requirement, become the good metallic substance in telecommunications, communications and transportation, empty day field.
4) magnesium alloy plate that adopts this processes to form has the advantage that technology is simple, production efficiency is high, mechanical property is good, quality product is excellent.
Description of drawings
Accompanying drawing 1 is magnesium alloy plate ply rolling deformation principle figure; Accompanying drawing 2 is this process flow sheet.
Embodiment
A kind of technology for high quality magnesium alloy plate large plastometric set, this technology is to carry out electric plastic working, asymmetrical rolling and accumulation ply rolling technology compound through repetition test basis repeatedly, has set the optimized parameter value and the new electricity that forms causes and induces the asynchronous ply rolling deformation technology of magnesium alloy plate.Wherein electric plastic working (EPR) technology is by Pulse Electric Current with High Density material internal atomic motion energy to be raise, change the dislocation intensity of activation, accelerate motion dislocation motion speed, open between dislocation and tangle, thereby overcome the obstacle on the slip plane, improved Plastic Deformation greatly.And asynchronous ply rolling (ARB) technology is to utilize double-working peripheral velocity difference, with the multi-ply wood rolling together technological process that stacks up.This electricity causes induces the asynchronous ply rolling deformation technology of magnesium alloy plate by rational rolling technological parameter coupling, has prevented the rolling crack generation, has guaranteed the rolled products quality.
In the present invention, used stock magnesium alloy is standard brand, standard-sized casting alloy magnesium or continuous casting and rolling magnesium alloy, and used milling train is common asynchronous roller mill.Adopt technique scheme, at first sheet material pre-treatment, milling is carried out on the sheet material two sides, sheet material is placed acetone solution, with ultrasonic cleaning to remove greasy dirt, to coat with the fine aluminium paillon foil through two of the magnesium alloy plates after the above-mentioned pretreatment operation or multi-disc then, the voltage that applies in the sheet material both sides is 110-150V, the pulsewidth of high energy electric pulse is 60-100 μ s, powering up treatment zone length is 200-400mm, start milling train, roll is realized the ply rolling distortion a certain asynchronous ratio, a certain pressing down under the rate through a time.The process flow sheet of this invention preparation method as shown in Figure 2.
Above-mentioned processing method combines every advantage of electric plastic working, asymmetrical rolling and accumulation ply rolling technology: 1. in the electric plastic processing, multiple-plate pulsed current is adjustable, every laminate is under different pulsed current effects, metal inside atom action ability increases, non-basal slip is activated in the magnesium alloy, independent slip system increases, and the intercrystalline slip ability strengthens, and plasticity increases greatly; 2. in the asymmetrical rolling process, two speed of rolls official post sheet materials are subjected to a pair of shearing stress effect, and direction is for after roller one side direction at a slow speed, before quick roll one side direction, thereby produce shear strain in the sheet metal thickness direction, cause basal plane texture to vert, thereby reduction basal plane texture has improved plasticity; 3. adopt the ply rolling technology can improve amount of plastic deformation, reduce the road number of times, enhance productivity.This EPR-ARB compounding technology is not the simple superposition of conventional deforming technique, but has realized the function iteration, parameter matching, the organic combination of power level coupling utilizes this technology that magnesium alloy is rolled distortion, its resistance to deformation is reduced greatly, and intensity is greatly enhanced.
Embodiment one:
1) magnesium alloy plate is prepared: at first prepare to be used for electricity and cause the sheet material of inducing asynchronous ply rolling, and standby after the pre-machining.
2) sheet material is carried out homogenizing and handle 5 ℃/min of heat-up rate, 400 ℃ of Heating temperatures, soaking time 40min, furnace cooling.
3) will be through the magnesium alloy plate surface Milling Process that homogenizing is handled, Milling Process requires high-speed milling, and the milling cutter rotating speed is greater than 2800r/min, and surfaceness is lower than Ra6.3 μ m.
4) will carry out ultrasonic cleaning through the sheet material that step 3) is handled.Scavenging solution acetone is to remove impurity and greasy dirt.
5) two of magnesium alloy plates behind the aforesaid operations are coated room-temperature aging with the fine aluminium paillon foil.
6) voltage that applies in the sheet material both sides is 110V, and the pulsewidth of high energy electric pulse is 60 μ s, powers up treatment zone length and is about 300mm.Start milling train, adjust top and bottom rolls speed, topping roll speed 1.2m/min, bottom roll speed 0.5m/min.The operation of rolling at room temperature with in the passage is finished, and adopts 40% volume under pressure, and the sheet material strain rate is 1s-1.
7) magnesium alloy plate after above-mentioned steps is handled is carried out anneal, 8 ℃/min of heat-up rate, 250 ℃ of Heating temperatures, soaking time 20min, furnace cooling.
Mechanical performance index through the rolling magnesium alloy plate of embodiment one sees attached list 3.
Embodiment two:
Basic identical with embodiment one, its difference is:
Step 2) processing parameter that homogenizing is handled in is 8 ℃/min of heat-up rate, 420 ℃ of Heating temperatures, soaking time 50min, furnace cooling.
The rotating speed 2900r/min of step 3) high speed milling, surfaceness is Ra3.2 μ m.
Three of the magnesium alloy plate of step 5) after with aforesaid operations coat with the fine aluminium paillon foil, preheat in resistance furnace, and Heating temperature is 200 ℃, and soaking time is 3-8min.
Step 6) is 115V with the voltage that sheet material taking-up both sides in the step 5) apply, and the pulsewidth of high energy electric pulse is 70 μ s, powers up treatment zone length and is about 250mm, middle topping roll speed 1.5m/min, bottom roll speed 0.8m/min.The operation of rolling is finished down and in a passage at 200 ℃, adopts 45% volume under pressure, and the sheet material strain rate is 1.5s-1.
Step 7) is carried out anneal with the magnesium alloy plate after above-mentioned steps is handled, 10 ℃/min of heat-up rate, 300 ℃ of Heating temperatures, soaking time 30min, furnace cooling.
Mechanical performance index through the rolling magnesium alloy plate of embodiment 2 sees attached list 3.
Embodiment three:
Basic identical with embodiment one, its difference is:
Step 2) processing parameter that homogenizing is handled in is 10 ℃/min of heat-up rate, 440 ℃ of Heating temperatures, soaking time 60min, furnace cooling.
The rotating speed 3000r/min of step 3) high speed milling, surfaceness is Ra3.2 μ m.
Four of the magnesium alloy plate of step 5) after with aforesaid operations coat with the fine aluminium paillon foil, preheat in resistance furnace, and Heating temperature is 300 ℃, and soaking time is 3-8min.
Step 6) is 115V with the voltage that sheet material taking-up both sides in the step 5) apply, and the pulsewidth of high energy electric pulse is 80 μ s, powers up treatment zone length and is about 250mm, middle topping roll speed 2m/min, bottom roll speed 1.2m/min.The operation of rolling is finished down and in a passage at 300 ℃, adopts 40% volume under pressure, and the sheet material strain rate is 1.8s-1.
Step 7) is carried out anneal with the magnesium alloy plate after above-mentioned steps is handled, 10 ℃/min of heat-up rate, 350 ℃ of Heating temperatures, soaking time 30min, furnace cooling.
Mechanical performance index through the rolling magnesium alloy plate of embodiment three sees attached list 3.
Embodiment four:
Basic identical with embodiment one, its difference is:
Step 2) processing parameter that homogenizing is handled in is 10 ℃/min of heat-up rate, 440 ℃ of Heating temperatures, soaking time 60min, furnace cooling.
The rotating speed 3000r/min of step 3) high speed milling, surfaceness is Ra3.2 μ m.
Five of the magnesium alloy plate of step 5) after with aforesaid operations coat with the fine aluminium paillon foil, preheat in resistance furnace, and Heating temperature is 350 ℃, and soaking time is 3-8min.
Step 6) is 115V with the voltage that sheet material taking-up both sides in the step 5) apply, and the pulsewidth of high energy electric pulse is 100 μ s, powers up treatment zone length and is about 250mm, middle topping roll speed 2.4m/min, bottom roll speed 1.4m/min.The operation of rolling is finished down and in a passage at 350 ℃, adopts 45% volume under pressure, and the sheet material strain rate is 2.0s-1.
Step 7) is carried out anneal with the magnesium alloy plate after above-mentioned steps is handled, 10 ℃/min of heat-up rate, 350 ℃ of Heating temperatures, soaking time 30min, furnace cooling.
Mechanical performance index through the rolling magnesium alloy plate of embodiment four sees attached list 3.
In addition, subordinate list 1 table is diecast magnesium alloy and rolling magnesium alloy mechanical property contrast table; Subordinate list 2 is magnesium alloy plate mechanical property contrast tables that existing rolling technique and processes of the present invention go out.
Table 1 diecast magnesium alloy, the contrast of rolling magnesium alloy mechanical property
The mechanical property contrast of the magnesium alloy plate that table 2 prior art and present technique are rolling
Mechanical property contrast under the different embodiment of table 3
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also belong to protection scope of the present invention.
Claims (7)
1. magnesium alloy plate large plastometric set technology, this technology may further comprise the steps:
The pre-treatment of magnesium alloy plate: magnesium alloy plate is standby through pre-machining processing back;
The homogenizing of magnesium alloy plate is handled: magnesium alloy plate is put into process furnace, heat-up rate 5-11 ℃/min, be heated to 400-450 ℃, insulation 40-70min, this sheet material furnace cooling after finishing;
The surface finishing of magnesium alloy plate: require the plate surface roughness to be lower than Ra6.3 μ m after the precision work;
The cleaning of magnesium alloy plate;
Preheating of magnesium alloy plate: two above magnesium alloy plates are coated with the fine aluminium paillon foil, put into resistance furnace and preheat,, thermal treatment temp is 200-350 ℃, soaking time is 3-8min;
The ply rolling distortion of magnesium alloy plate: the sheet material of magnesium alloy is put into milling train, make magnesium alloy plate carry out asynchronous method ply rolling distortion;
The anneal of magnesium alloy plate: magnesium alloy plate is carried out anneal according to following requirement: heat-up rate 8-18 ℃/min, Heating temperature 250-350 ℃, soaking time 20-40min, furnace cooling after finishing.
2. magnesium alloy plate large plastometric set technology, this technology may further comprise the steps:
The pre-treatment of magnesium alloy plate: magnesium alloy plate is standby through pre-machining processing back;
The homogenizing of magnesium alloy plate is handled: magnesium alloy plate is put into process furnace, heat-up rate 5-11 ℃/min, be heated to 400-450 ℃, insulation 40-70min, this sheet material furnace cooling after finishing;
The surface finishing of magnesium alloy plate: require the plate surface roughness to be lower than Ra6.3 μ m after the precision work;
The cleaning of magnesium alloy plate;
The ply rolling distortion of magnesium alloy plate: the sheet material of magnesium alloy is put into milling train, make magnesium alloy plate carry out asynchronous method ply rolling distortion;
The anneal of magnesium alloy plate: magnesium alloy plate is carried out anneal according to following requirement: heat-up rate 8-18 ℃/min, Heating temperature 250-350 ℃, soaking time 20-40min, furnace cooling after finishing.
3. according to claim 1 or 2 described magnesium alloy plate large plastometric set technologies, it is characterized in that: the cleaning of described magnesium alloy plate is that magnesium alloy plate is placed acetone solution, uses ultrasonic cleaning to remove plate surface impurity and greasy dirt.
4. according to claim 1 or 2 described magnesium alloy plate large plastometric set technologies, it is characterized in that: described asynchronous method ply rolling distortion refers to that the magnesium alloy plate more than two that will be coated in the fine aluminium thin slice is placed in the roll of milling train, described roll comprises topping roll and bottom roll, and upper and lower roll has different working speeds.
5. according to the described magnesium alloy plate large plastometric set of claim 4 technology, it is characterized in that: described topping roll speed is between 1.2-2.5m/min, and bottom roll speed is between 0.5-1.4m/min.
6. according to the described magnesium alloy plate large plastometric set of claim 1 technology, it is characterized in that: the voltage that is applied to the sheet material both sides in the ply rolling distortion of described magnesium alloy plate is 110-150V, the pulsewidth of high energy electric pulse is 60-100 μ s, powers up treatment zone length and is about 200-400mm.
7. according to the described magnesium alloy plate large plastometric set of claim 1 technology, it is characterized in that: the rolling of magnesium alloy finished in a passage in the ply rolling distortion of described magnesium alloy plate, has big volume under pressure 40-60%, the sheet material strain rate: 1-2.5 s
-1
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| CN103882356A (en) * | 2014-03-19 | 2014-06-25 | 吉林大学 | Method for preparing fine-grained magnesium alloy with superplastic deformability |
| CN103981473A (en) * | 2014-05-12 | 2014-08-13 | 太原理工大学 | Preparation method of fine-granular magnesium alloy plate |
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| CN111360072A (en) * | 2020-03-13 | 2020-07-03 | 吉林大学 | Rolling equipment based on high-frequency current assistance and high-reduction rolling method |
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| CN103276328B (en) | 2015-05-27 |
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