CN111570512A - High-toughness magnesium alloy plate and laminating and rolling preparation method thereof - Google Patents
High-toughness magnesium alloy plate and laminating and rolling preparation method thereof Download PDFInfo
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- CN111570512A CN111570512A CN202010433353.6A CN202010433353A CN111570512A CN 111570512 A CN111570512 A CN 111570512A CN 202010433353 A CN202010433353 A CN 202010433353A CN 111570512 A CN111570512 A CN 111570512A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 113
- 238000005096 rolling process Methods 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000010030 laminating Methods 0.000 title description 2
- 239000000956 alloy Substances 0.000 claims abstract description 84
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 83
- 230000009467 reduction Effects 0.000 claims abstract description 25
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
- B21B47/02—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal for folding sheets before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention provides a high-strength and high-toughness magnesium alloy plate and a superposition rolling preparation method thereof, wherein the superposition rolling preparation method of the high-strength and high-toughness magnesium alloy plate comprises the following steps: cleaning the surface of the alloy plate, fixedly pressing the laminated plate and the hard alloy thin plate lining plate, preserving heat, synchronously rolling the fixed plate to be rolled and the hard alloy thin plate lining plate, naturally cooling, and removing the alloy thin plate lining plate to obtain the integrated plate. According to the invention, the stress of the plate is changed by adding the lining plate, the single-pass rolling reduction and the shearing deformation are improved, and the joint surface of the plate is firmer while the texture is weakened; the total reduction is ensured, and the bonding interface is reduced, so that the poor plasticity caused by excessive bonding interfaces is reduced; the low-temperature formability of the rolled plate is ensured, the rejection rate is reduced, the serious oxidation of the bonding surface at high temperature is avoided, and the cooperative promotion of the tensile strength and the elongation is finally realized. The preparation method is simple, the number of rolling passes is small, and the performance of the magnesium alloy plate is improved.
Description
Technical Field
The invention belongs to the field of metal materials and processing thereof, and particularly relates to a high-toughness magnesium alloy plate and a superposition rolling preparation method thereof.
Background
The magnesium alloy is used as the lightest structural metal material, and has good application prospect in the industries of national defense, automobiles, electronics and the like. Because the ultimate tensile strength of the magnesium alloy is low, the fine grain strengthening is taken as an important means for effectively improving the mechanical property of the magnesium alloy and is widely concerned at home and abroad. At present, magnesium alloy materials with high strength and high toughness are prepared by a large deformation method internationally. The large deformation method mainly comprises equal channel angular extrusion, high-pressure torsion, cumulative lap rolling and the like. The accumulative rolling is carried out by repeated superposition rolling of plates, so that the accumulative superposition of rolling reduction is realized, the grains are repeatedly deformed and recrystallized, and the grain refinement is realized. Pack rolling has three distinct advantages: firstly, high-load forming equipment and expensive dies are not required; secondly, the material production efficiency is high; thirdly, the method is suitable for producing large-size plates, belts and other structural materials.
Therefore, the pack rolling is considered as the only large deformation technology which can realize the large-scale industrial continuous production of the ultrafine grained material at present. However, the pack rolling needs to be performed under a large reduction amount to achieve good material connection. For magnesium alloy, the cracking of the plate is easily caused by the excessively low rolling temperature or the excessively large rolling reduction; however, too high temperature will cause severe oxidation of the bonding surface, easy growth of crystal grains, excessive interface inclusions and reduced plasticity. In addition, in the field of magnesium alloys, the existing pack rolling process is mostly suitable for easily deformable magnesium alloys, such as AZ31 and ZK60 magnesium alloys, but is difficult to be suitable for the difficultly deformable magnesium alloys with higher strength, such as AZ91, and the performance and application of the pack rolling magnesium alloy are greatly limited.
And (3) conventional magnesium alloy pack rolling: (1) the rolling temperature is below the alloy recrystallization temperature; (2) the single-pass rolling reduction is too large, so that cracking is easily caused, and if the single-pass rolling reduction is too small, the stability of a joint surface is poor. Therefore, the pack rolling is not suitable for preparing the magnesium alloy difficult to deform, and the performance and the application of the pack rolling magnesium alloy are greatly limited.
The invention breaks through the limitations that the conventional accumulative rolling passes are multiple, the rolling temperature is high, the reduction is small and the method is not suitable for magnesium alloy difficult to deform, and develops the superposition rolling method for preparing the magnesium alloy plate with high strength and toughness. The stress of the plate is changed by adding the alloy thin plate lining plate, the single-pass reduction is improved, the single-pass shear deformation is increased, the joint surface is firmer while the texture is weakened, the total reduction is ensured, and the joint interface is reduced, so that the plasticity difference caused by excessive interfaces is reduced; the low-temperature formability of the rolled plate is ensured, the rejection rate is greatly reduced, the serious oxidation of the bonding surface under the high-temperature condition is avoided, and the cooperative promotion of the tensile strength and the elongation is finally realized. The rolling method of the invention is simple, and is also applicable to the same or different magnesium alloys, even magnesium and aluminum alloy. Compared with the conventional pack rolling, the rolling pass is obviously reduced, the rolling temperature is obviously reduced by 50-100 ℃, the obtained material has higher performance, and an effective way is provided for preparing the high-strength plastic magnesium alloy plate with low cost and short process.
Disclosure of Invention
Aiming at the defects of the conventional pack rolling technology, the invention aims to develop a pack rolling method for preparing a high-strength and high-toughness magnesium alloy plate, the pack rolling can be carried out under the conditions of low temperature and large reduction by adding a lining plate, the problem that the conventional pack rolling is not suitable for magnesium alloy difficult to deform is solved, the joint surface is reinforced, the texture is weakened, and the plate performance is greatly improved.
The technical scheme of the invention is as follows: and (3) overlapping the rolled plates in sequence, adding the lining plates, synchronously rolling, repeatedly rolling the plates at low temperature and high rolling reduction (the heat preservation temperature is 225-350 ℃, and the time is 5-20 min), and finally naturally cooling the plates to room temperature along with the lining plates.
The invention provides a superposition rolling preparation method of a high-strength and high-toughness magnesium alloy plate, which comprises the following steps:
(1) selecting 2-10 alloy plates with the thickness of 1-10 mm, cleaning the surfaces of the alloy plates by using alcohol, polishing the surfaces of the alloy plates by using an angle grinder, and finally cleaning the surfaces of the plates by using acetone to obtain the alloy plates to be rolled;
(2) each alloy plate to be rolled in the step (1) is counted as one layer, and each alloy plate to be rolled in the step (1) is overlapped to obtain 2-10 layers of overlapped alloy plates to be rolled;
(3) and (3) respectively fixing a hard alloy plate thin plate lining plate on the upper surface and the lower surface of the superposed alloy plate to be rolled in the step (2), fixing and pressing the alloy plate to be rolled and the hard alloy plate thin plate lining plate through a fixing device, heating to 225-350 ℃, preserving heat for 5-30 min, then carrying out single-pass rolling, wherein the reduction is 50-90%, the roller temperature is 50-100 ℃, naturally cooling to room temperature after rolling, and removing the hard alloy plate thin plate lining plate to obtain the integrated magnesium alloy plate.
The alloy plate in the step (1) is any one of Mg-3Al-1Sn-1Zn, AZ31, AZ61, AZ80, AZ91, ZK60, AM41 or WE43 magnesium alloy.
And (3) overlapping the alloy plates to be rolled by 2-6 layers.
And (3) the thickness of the hard alloy sheet lining plate is 1-10 mm, and the fixing device is fixed by binding thin iron wires at the front end and the rear end of the hard alloy sheet lining plate so as to clamp the middle alloy sheet to be rolled.
The heating temperature in the step (3) is 225-325 ℃.
And (4) keeping the temperature for 5-20 min in the step (3).
And (4) reducing the single-pass reduction amount of 60-90% in the step (3).
And (3) uniformly cutting 2-10 parts of the integrated magnesium alloy plate to obtain a plate, and processing the plate according to the superposition rolling method in the steps (1), (2) and (3).
And (3) uniformly cutting 2-6 parts of the integrated magnesium alloy plate to obtain a plate, and processing the plate according to the superposition rolling method in the steps (1), (2) and (3).
The invention also provides a high-strength and high-toughness magnesium alloy plate which is prepared by the superposition rolling preparation method of the high-strength and high-toughness magnesium alloy plate.
Drawings
FIG. 1 is a schematic view of a superposition rolling method for magnesium alloy plates.
Detailed Description
Example 1
6 pieces of commercial Mg-3Al-1Sn-1Zn magnesium alloy with the thickness of 1mm are taken as an example and rolled in the following way:
(1) preliminarily cleaning a magnesium alloy surface to be combined by using alcohol, polishing the magnesium alloy plate surface to be combined by using an angle grinder, removing impurities to expose a fresh surface, cleaning the surface to be combined by using acetone, and removing oil stains on the surface to obtain the magnesium alloy plate to be rolled;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 1mm on the upper surface and the lower surface of the magnesium alloy plate to be rolled which is overlapped in the step (2), binding the front end and the rear end of each hard alloy plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate lining plates to 225 ℃ in a heating box, keeping the temperature for 15 minutes, then sending the alloy plate to be rolled and the hard alloy plate lining plates into rollers for synchronous rolling, wherein the single-pass reduction is 80%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the magnesium alloy plate which is integrated;
(4) and (4) cutting the integrated magnesium alloy plate obtained in the step (3) into halves to obtain 2 plates to be rolled, rolling according to the steps (1) to (3), and repeating the steps for 2 times to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (4) at room temperature is more than or equal to 350MPa, and the elongation at room temperature is more than or equal to 12%.
Example 2
Taking 1 piece of commercial AZ31 magnesium alloy extruded with the thickness of 5mm and 1 piece of commercial AZ91 magnesium alloy extruded with the thickness of 5mm as examples, rolling is carried out in the following way:
(1) preliminarily cleaning a to-be-bonded surface of the magnesium alloy plate by using alcohol, polishing the to-be-bonded surface of the magnesium alloy plate by using an angle grinder, removing impurities to expose a fresh surface, cleaning the to-be-bonded surface by using acetone, and removing oil stains on the surface to obtain the to-be-rolled magnesium alloy plate;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 2mm on the upper surface and the lower surface of the magnesium alloy plate to be rolled which is overlapped in the step (2), binding the front end and the rear end of each hard alloy plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate lining plates to 325 ℃ in a heating box, keeping the temperature for 5 minutes, then sending the alloy plate to be rolled and the hard alloy plate lining plates into rollers for synchronous rolling, wherein the single-pass reduction is 60%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the magnesium alloy plate which is integrated;
(4) and (4) cutting the integrated magnesium alloy plate obtained in the step (3) into halves to obtain 2 plates to be rolled, rolling according to the steps (1) to (3), and repeating the steps for 2 times to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (4) at room temperature is more than or equal to 320MPa, and the elongation at room temperature is more than or equal to 15%.
Example 3
Taking 2 pieces of commercial AZ31 magnesium alloy extruded with the thickness of 5mm as an example, rolling is carried out in the following way:
(1) preliminarily cleaning a to-be-bonded surface of the magnesium alloy plate by using alcohol, polishing the to-be-bonded surface of the magnesium alloy plate by using an angle grinder, removing impurities to expose a fresh surface, cleaning the to-be-bonded surface by using acetone, and removing oil stains on the surface to obtain the to-be-rolled magnesium alloy plate;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 1mm on the upper surface and the lower surface of the magnesium alloy plate to be rolled in the step (2) respectively, binding the front end and the rear end of each hard alloy plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate thin plate lining plates to 275 ℃ in a heating box, keeping the temperature for 15 minutes, then sending the alloy plate to be rolled and the hard alloy plate thin plate lining plates into rollers for synchronous rolling, wherein the single-pass reduction is 85%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (3) at room temperature is more than or equal to 330MPa, and the elongation at room temperature is more than or equal to 20%.
Example 4
Taking 2 pieces of commercial ZK60 magnesium alloy extruded with the thickness of 5mm as an example, rolling is carried out in the following way:
(1) preliminarily cleaning a to-be-bonded surface of the magnesium alloy plate by using alcohol, polishing the to-be-bonded surface of the magnesium alloy plate by using an angle grinder, removing impurities to expose a fresh surface, cleaning the to-be-bonded surface by using acetone, and removing oil stains on the surface to obtain the to-be-rolled magnesium alloy plate;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 5mm on the upper surface and the lower surface of the magnesium alloy plate to be rolled which is overlapped in the step (2), binding the front end and the rear end of each hard alloy plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate thin plate lining plates to 325 ℃ in a heating box, keeping the temperature for 20 minutes, conveying the alloy plate to be rolled and the hard alloy plate thin plate lining plates into rollers, synchronously rolling, wherein the single-pass reduction is 70%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the integrated magnesium alloy plate;
(4) and (4) cutting the integrated magnesium alloy plate obtained in the step (3) into 6 parts by equal parts to obtain 6 plates to be rolled, rolling according to the steps (1) to (3), and repeating the steps for 2 times to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (4) at room temperature is more than or equal to 380MPa, and the elongation at room temperature is more than or equal to 18%.
Example 5
Taking 2 pieces of commercial AZ80 magnesium alloy extruded with the thickness of 10mm as an example, rolling is carried out in the following way:
(1) preliminarily cleaning a to-be-bonded surface of the magnesium alloy plate by using alcohol, polishing the to-be-bonded surface of the magnesium alloy plate by using an angle grinder, removing impurities to expose a fresh surface, cleaning the to-be-bonded surface by using acetone, and removing oil stains on the surface to obtain the to-be-rolled magnesium alloy plate;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 2mm on the upper surface and the lower surface of the magnesium alloy plate overlapped in the step (2), binding the front end and the rear end of each hard alloy plate thin plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate thin plate lining plates to 350 ℃ in a heating box, keeping the temperature for 15 minutes, then sending the alloy plate to be rolled and the hard alloy plate thin plate lining plates into rollers for synchronous rolling, wherein the single-pass reduction is 90%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the integrated magnesium alloy plate;
(4) and (4) cutting the integrated magnesium alloy plate obtained in the step (3) into 3 parts by equal parts to obtain 3 plates to be rolled, rolling according to the steps (1) to (3), and repeating the steps for 4 times to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (4) at room temperature is more than or equal to 390MPa, and the elongation at room temperature is more than or equal to 12%.
Example 6
Taking 2 cast commercial AZ91 magnesium alloys with thickness of 5mm as an example, rolling is carried out in the following way:
(1) preliminarily cleaning a to-be-bonded surface of the magnesium alloy plate by using alcohol, polishing the to-be-bonded surface of the magnesium alloy plate by using an angle grinder, removing impurities to expose a fresh surface, cleaning the to-be-bonded surface by using acetone, and removing oil stains on the surface to obtain the to-be-rolled magnesium alloy plate;
(2) the magnesium alloy plate to be rolled obtained in the step (1) is overlapped neatly;
(3) placing hard alloy plate thin plate lining plates with the thickness of 1mm on the upper surface and the lower surface of the magnesium alloy plate which is overlapped orderly in the step (2), binding the front end and the rear end of each hard alloy plate lining plate by using iron wires to fix and clamp the alloy plate to be rolled, heating the alloy plate to be rolled and the hard alloy plate lining plates to 325 ℃ in a heating box, keeping the temperature for 10 minutes, then sending the alloy plate to be rolled and the hard alloy plate lining plates into rollers for synchronous rolling, wherein the single-pass reduction is 80%, naturally cooling the rolled plate to the room temperature along with the lining plates, and then removing the lining plates to obtain the integrated magnesium alloy plate;
(4) and (4) cutting the integrated magnesium alloy plate obtained in the step (3) into half pieces to obtain 2 plates to be rolled, and rolling according to the steps (1) to (3) to obtain the integrated magnesium alloy plate.
The tensile strength of the magnesium alloy plate obtained in the step (4) at room temperature is more than or equal to 410MPa, and the elongation at room temperature is more than or equal to 13%.
Table 1 comparison of the properties of example 3, example 4 and example 6 with those of materials obtained by conventional pack rolling
Compared with the prior art, the invention has the following characteristics:
(1) the method breaks through the limitation that the pack rolling is not suitable for preparing the magnesium alloy with high alloy content and difficult deformation, changes the stress state of the plate in the rolling process, and obviously improves the formability of the magnesium alloy with difficult deformation at low temperature; meanwhile, the single-pass reduction is greatly increased, the single-pass shearing force is increased, the basal plane texture is weakened, and the formability of the magnesium alloy is improved.
(2) The advantages of low-temperature large-reduction rolling are fully utilized, rolling passes, the number of interfaces and interface oxidation are reduced, the process is simplified, the adverse effect of the interface oxide on plasticity is reduced, and the synergistic improvement of strong plasticity is realized.
(3) The bottleneck that the traditional pack rolling deformation temperature is high and the single-pass reduction is small is broken through, the low-temperature rolling dynamic recrystallization is realized through the synergistic regulation and control of the reduction and the temperature, the magnesium alloy plate with strong plasticity can be obtained without subsequent recrystallization annealing heat treatment, and the energy consumption is saved.
Claims (10)
1. A superposition rolling preparation method of a high-strength and high-toughness magnesium alloy plate is characterized by comprising the following steps: the method comprises the following steps:
(1) selecting 2-10 alloy plates with the thickness of 1-10 mm, cleaning the surfaces of the alloy plates by using alcohol, polishing the surfaces of the alloy plates by using an angle grinder, and finally cleaning the surfaces of the plates by using acetone to obtain the alloy plates to be rolled;
(2) each alloy plate to be rolled in the step (1) is counted as one layer, and each alloy plate to be rolled in the step (1) is overlapped to obtain 2-10 layers of overlapped alloy plates to be rolled;
(3) and (3) respectively fixing a hard alloy plate thin plate lining plate on the upper surface and the lower surface of the superposed alloy plate to be rolled in the step (2), fixing and pressing the alloy plate to be rolled and the hard alloy plate thin plate lining plate through a fixing device, heating to 225-350 ℃, preserving heat for 5-30 min, then carrying out single-pass rolling, wherein the reduction is 50-90%, the roller temperature is 50-100 ℃, naturally cooling to room temperature after rolling, and removing the hard alloy plate thin plate lining plate to obtain the integrated magnesium alloy plate.
2. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: the alloy plate in the step (1) is any one of Mg-3Al-1Sn-1Zn, AZ31, AZ61, AZ80, AZ91, ZK60, AM41 or WE43 magnesium alloy.
3. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: and (3) overlapping the alloy plates to be rolled by 2-6 layers.
4. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: and (3) the thickness of the hard alloy sheet lining plate is 1-10 mm, and the fixing device is fixed by binding thin iron wires at the front end and the rear end of the hard alloy sheet lining plate so as to clamp the middle alloy sheet to be rolled.
5. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: the heating temperature in the step (3) is 225-325 ℃.
6. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: and (4) keeping the temperature for 5-20 min in the step (3).
7. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: and (4) reducing the single-pass reduction amount of 60-90% in the step (3).
8. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 1, which is characterized by comprising the following steps: and (3) uniformly cutting 2-10 parts of the integrated magnesium alloy plate to obtain a plate, and processing the plate according to the superposition rolling method in the steps (1), (2) and (3).
9. The superposition rolling preparation method of the high-toughness magnesium alloy plate according to claim 8, which is characterized by comprising the following steps: and (3) uniformly cutting 2-6 parts of the integrated magnesium alloy plate to obtain a plate, and processing the plate according to the superposition rolling method in the steps (1), (2) and (3).
10. A high-strength tough magnesium alloy plate is characterized in that: the high-toughness magnesium alloy plate is prepared by the superposition rolling preparation method of any one of the high-toughness magnesium alloy plates in claims 1-9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974528A (en) * | 2021-02-05 | 2021-06-18 | 南京理工大学 | High-strength high-plasticity layered isomeric magnesium-lithium composite material and preparation method thereof |
| CN113649413A (en) * | 2021-07-20 | 2021-11-16 | 吉林大学 | Method for preparing lamellar homogeneous heterogeneous light alloy plate through asymmetric cumulative rolling process |
| CN114850215A (en) * | 2022-04-27 | 2022-08-05 | 燕山大学 | TiAl alloy plate rolling method and device |
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