CN114082783A - Preparation method of single-pass high-reduction-weight magnesium alloy plate - Google Patents
Preparation method of single-pass high-reduction-weight magnesium alloy plate Download PDFInfo
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- CN114082783A CN114082783A CN202111390240.3A CN202111390240A CN114082783A CN 114082783 A CN114082783 A CN 114082783A CN 202111390240 A CN202111390240 A CN 202111390240A CN 114082783 A CN114082783 A CN 114082783A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 128
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 239000010935 stainless steel Substances 0.000 claims abstract description 49
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 230000009467 reduction Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000005238 degreasing Methods 0.000 claims abstract description 15
- 238000004321 preservation Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000000314 lubricant Substances 0.000 claims description 14
- 229910052582 BN Inorganic materials 0.000 claims description 7
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical group N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013535 sea water Substances 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
-
- 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
- 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
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
- B21B47/04—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal for separating layers after rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention is suitable for the field of metal processing, and provides a method for preparing a single-pass magnesium alloy plate with large reduction, which comprises the following steps: respectively carrying out degreasing treatment on the outer surface of the magnesium alloy bar and the inner wall of the stainless steel pipe to obtain a clean surface; assembling magnesium alloy bars into the steel pipe, and sealing edges of two ends of the steel pipe by a press machine to obtain a completely sealed sample; putting the completely sealed sample into a heating furnace for heat preservation for a certain time; carrying out a rolling process on the sample with the maintained temperature; and cutting off the steel pipe by using a cutting means to obtain the formed magnesium alloy plate. The invention provides a preparation method of a single-pass and large-reduction rolled magnesium alloy plate, which solves the problems of multiple passes and small single-pass reduction in the traditional magnesium alloy plate rolling process, the room temperature strength of the magnesium alloy plate prepared by the process is more than 300MPa, the room temperature elongation reaches more than 23%, and the simultaneous realization of the strength and the elongation is ensured.
Description
Technical Field
The invention belongs to the field of metal processing, and particularly relates to a method for preparing a single-pass magnesium alloy plate with large reduction.
Background
Magnesium alloys, the lightest structural material at present, have a density of about two-thirds that of aluminum and one-fourth that of steel. Magnesium is an abundant element, and is the eighth of the element content in the earth crust and the third of the ion content in the seawater. Meanwhile, the material has excellent performances of high specific strength, high specific stiffness and the like, is known as a green engineering material in the 21 st century, and has wider application prospect in the industries of aerospace, automobiles, 3C and the like. With the increasing requirements of our country on environmental protection, energy conservation and emission reduction, the field of metal lightweight becomes one of the important development trends of industrial development, and in addition, our country's magnesium reserves account for 67% of the total reserves in the global terrestrial range, which is a genuine "magnesium kingdom", so the demand for high-performance magnesium alloys will also increase continuously.
Although magnesium alloys have started to be used industrially since the beginning of the 20 th century, the inherent properties of magnesium have restricted their further development: 1. magnesium alloy has a hexagonal close-packed structure and has a poor room-temperature formability because of a small number of independent slip systems that can be opened at room temperature. The traditional magnesium alloy plate rolling process is easy to generate stronger basal plane texture, thereby being not beneficial to the subsequent processing process. 2. The current commercial magnesium alloy plate rolling process mainly adopts a multi-pass and small reduction mode.
However, the conventional commercial magnesium alloy plate needs to be heated for multiple times between rolling passes; during rolling, the deformation in the rolling direction and the deformation in the transverse direction are highly likely to be uneven, and particularly uneven widening causes edge cracking, which seriously increases the rejection rate during rolling.
Disclosure of Invention
The embodiment of the invention aims to provide a method for preparing a single-pass magnesium alloy plate with large reduction, aiming at solving the problem that the conventional commercial magnesium alloy plate needs to be heated for multiple times during rolling passes; during rolling, the deformation in the rolling direction and the deformation in the transverse direction are extremely likely to be uneven, and particularly uneven widening causes the occurrence of edge cracking, which seriously increases the rejection rate during rolling.
The embodiment of the invention is realized in such a way that a single-pass high-reduction magnesium alloy plate preparation method comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy;
step S5: after the magnesium alloy bar is inserted into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment;
step S7: carrying out single-pass rolling on the heated sample;
step S8: and (4) after air cooling, taking out the magnesium alloy plate in the sample by using linear cutting.
According to a further aspect, according to S4, the lubricant is boron nitride.
According to a further technical scheme, according to S5, the length of a magnesium alloy bar = the length of a stainless steel tube-10 cm; the inner surface of the press is in full contact with the steel pipe surface.
According to a further technical scheme, the temperature of the heating furnace is 350-380 ℃ according to S6.
According to a further technical scheme, according to S6, the heat preservation time is 30-40 min.
According to a further technical scheme, according to S7, the rolling reduction is 70% -80%.
According to a further technical scheme, according to S7, the rolling linear speed is 500 mm/S-1000 mm/S.
The embodiment of the invention provides a single-pass and large-reduction magnesium alloy plate preparation method, and the rolling method has the following beneficial effects: 1. compared with the traditional rolling process, the preparation process only needs single-pass rolling, the pass reduction can reach more than 80%, and the energy consumption caused by excessive rolling passes and heating among the passes is reduced. 2. The magnesium alloy plate is prepared by rolling a magnesium alloy rod into a magnesium alloy plate, so that the plastic deformation efficiency is improved to the maximum extent. 3. The preparation process of the magnesium alloy plate material is three-phase stress rolling, and the magnesium alloy is restrained in three directions, namely the rolling direction, the normal direction and the transverse direction in the deformation process due to the limitation of the stainless steel pipe, so that the number of compressive stresses in the deformation process of the magnesium alloy is effectively increased, and the plasticity of the magnesium alloy is further improved. 4. Compared with the magnesium alloy bar before deformation, the tensile strength of the magnesium alloy plate prepared by the patented process is improved to 305MPa, the improvement range is 45 percent, the room-temperature elongation is improved to 23.2 percent, and the improvement range is 157 percent; 5. in the invention, the average grain size before deformation is 25 μm, and the average grain size after deformation is 5 μm, thereby achieving the obvious grain refinement effect.
Drawings
FIG. 1 is a process scheme of a preparation method according to an embodiment of the present invention;
FIG. 2 is a stress-strain diagram of a magnesium alloy at room temperature according to an embodiment of the present invention;
FIG. 3 is a diagram of a phase of a magnesium alloy before deformation in an embodiment of the present invention;
FIG. 4 is a diagram of a phase of a magnesium alloy after deformation according to an embodiment of the present invention;
FIG. 5 is a pole drawing of a magnesium alloy after deformation in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
Example one
As shown in fig. 1, 2, 3, 4 and 5, a single-pass, high-reduction magnesium alloy sheet preparation method provided by an embodiment of the invention comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy, wherein the lubricant is boron nitride;
step S5: after inserting the magnesium alloy bar into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe, wherein: the length of the magnesium alloy bar = the length of the stainless steel tube-10 cm; the inner surface of the press is in complete contact with the surface of the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment, wherein the temperature of the heating furnace is 350 ℃, and the heat preservation time is 30 min;
step S7: carrying out single-pass rolling on the heated sample, wherein the rolling reduction is 70%, and the rolling linear velocity is 600 mm/s;
step S8: and (4) air-cooling the rolled sample, and then taking out the magnesium alloy plate in the sample by using linear cutting.
In the embodiment of the invention, 1, a magnesium alloy rod with the length of 80mm and the diameter of 5mm and a stainless steel pipe with the length of 120mm, the wall thickness of 1mm and the inner diameter of 5mm are selected as raw materials. The magnesium alloy is AZ61, and the stainless steel is 0Cr18Ni 9.
2. After the magnesium alloy and the stainless steel pipe are respectively degreased, the magnesium alloy rod is inserted into the stainless steel pipe, and due to the length dimension, the two ends of the stainless steel pipe are respectively in a hollow state of 20 mm.
3. The hollow state mentioned in 2 was flattened to a completely closed state using a press, and placed in a heating furnace to be heated at 350 ℃.
4. Standing and keeping the temperature for 30 min.
5. And (3) placing the heated sample into a rolling mill for single-pass rolling, wherein the rolling reduction is 70%, the diameter of the roller is 400mm, and the linear velocity of the roller is 600 mm/s.
6. And cutting off the redundant stainless steel pipe part by using wire cutting to obtain the magnesium alloy plate.
The average grain size of the formed magnesium alloy sheet is 5 mu m, the yield strength is 220MPa, the tensile strength is 310MPa, and the fracture elongation is 23.1%.
Example two
As shown in fig. 1, 2, 3, 4 and 5, a single-pass, high-reduction magnesium alloy sheet preparation method provided by an embodiment of the invention comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy, wherein the lubricant is boron nitride;
step S5: after inserting the magnesium alloy bar into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe, wherein: the length of the magnesium alloy bar = the length of the stainless steel tube-10 cm; the inner surface of the press is in complete contact with the surface of the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment, wherein the temperature of the heating furnace is 355 ℃, and the heat preservation time is 32 min;
step S7: carrying out single-pass rolling on the heated sample, wherein the rolling reduction is 70%, and the rolling linear velocity is 550 mm/s;
step S8: and (4) air-cooling the rolled sample, and then taking out the magnesium alloy plate in the sample by using linear cutting.
EXAMPLE III
As shown in fig. 1, 2, 3, 4 and 5, a single-pass, high-reduction magnesium alloy sheet preparation method provided by an embodiment of the invention comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy, wherein the lubricant is boron nitride;
step S5: after inserting the magnesium alloy bar into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe, wherein: the length of the magnesium alloy bar = the length of the stainless steel pipe-10 cm; the inner surface of the press is in complete contact with the surface of the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment, wherein the temperature of the heating furnace is 360 ℃, and the heat preservation time is 32 min;
step S7: carrying out single-pass rolling on the heated sample, wherein the rolling reduction is 71%, and the rolling linear velocity is 555 mm/s;
step S8: and (4) air-cooling the rolled sample, and then taking out the magnesium alloy plate in the sample by using linear cutting.
Example four
As shown in fig. 1, 2, 3, 4 and 5, a single-pass, high-reduction magnesium alloy sheet preparation method provided by an embodiment of the invention comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy, wherein the lubricant is boron nitride;
step S5: after inserting the magnesium alloy bar into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe, wherein: the length of the magnesium alloy bar = the length of the stainless steel tube-10 cm; the inner surface of the press is in complete contact with the surface of the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment, wherein the temperature of the heating furnace is 370 ℃, and the heat preservation time is 33 min;
step S7: carrying out single-pass rolling on the heated sample, wherein the rolling reduction is 72%, and the rolling line speed is 560 mm/s;
step S8: and (4) after air cooling, taking out the magnesium alloy plate in the sample by using linear cutting.
EXAMPLE five
As shown in fig. 1, 2, 3, 4 and 5, a single-pass, high-reduction magnesium alloy sheet preparation method provided by an embodiment of the invention comprises the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy, wherein the lubricant is boron nitride;
step S5: after inserting the magnesium alloy bar into the stainless steel pipe, flattening both ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe, wherein: the length of the magnesium alloy bar = the length of the stainless steel tube-10 cm; the inner surface of the press is in complete contact with the surface of the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment, wherein the temperature of the heating furnace is 380 ℃, and the heat preservation time is 40 min;
step S7: carrying out single-pass rolling on the heated sample, wherein the rolling reduction is 80%, and the rolling linear velocity is 1000 mm/s;
step S8: and (4) air-cooling the rolled sample, and then taking out the magnesium alloy plate in the sample by using linear cutting.
In the embodiment of the invention, the invention aims to provide a preparation method of a single-pass and large-reduction rolled magnesium alloy plate, solves the problems of more passes and small single-pass reduction in the traditional magnesium alloy plate rolling process, and provides a preparation method for efficiently manufacturing a high-strength and edge-crack-free magnesium alloy plate. The patent technical scheme of the invention is as follows: the magnesium alloy bar is inserted into the stainless steel pipe, the diameter of the magnesium alloy bar is the same as the inner diameter of the stainless steel pipe, the length of the magnesium alloy bar is slightly shorter than that of the stainless steel pipe, and the stress state of the magnesium alloy in the deformation process is changed after edge sealing of a press machine, so that the magnesium alloy is completely limited to the deformation of the stainless steel pipe in the rolling process, namely the rolling direction is the length direction of the stainless steel pipe; therefore, the magnesium alloy can still limit the occurrence of edge crack under a state of a large reduction. The tensile strength of the magnesium alloy sheet prepared by the process is more than 300MPa, the Vickers hardness is more than 85 (HV 0.1), the average grain size is thinned to be less than 5 mu m, and the rolling process is simple and simultaneously ensures higher strength and hardness.
The embodiment of the invention provides a single-pass and large-reduction magnesium alloy plate preparation method, and the rolling method has the following beneficial effects: 1. compared with the traditional rolling process, the preparation process only needs single-pass rolling, the pass reduction can reach more than 80%, and the energy consumption caused by excessive rolling passes and heating among the passes is reduced. 2. The magnesium alloy plate is prepared by rolling a magnesium alloy rod into a magnesium alloy plate, so that the plastic deformation efficiency is improved to the maximum extent. 3. The preparation process of the magnesium alloy plate material is three-phase stress rolling, and the magnesium alloy is restrained in three directions, namely the rolling direction, the normal direction and the transverse direction in the deformation process due to the limitation of the stainless steel pipe, so that the number of compressive stresses in the deformation process of the magnesium alloy is effectively increased, and the plasticity of the magnesium alloy is further improved. 4. Compared with the magnesium alloy bar before deformation, the tensile strength of the magnesium alloy plate prepared by the patented process is improved to 305MPa, the improvement range is 45 percent, the room-temperature elongation is improved to 23.2 percent, and the improvement range is 157 percent; 5. in the invention, the average grain size before deformation is 25 μm, and the average grain size after deformation is 5 μm, thereby achieving the obvious grain refinement effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The preparation method of the magnesium alloy plate with single pass and large reduction is characterized by comprising the following steps:
step S1: degreasing the surface of the magnesium alloy bar to obtain a magnesium alloy bar with a clean surface;
step S2: degreasing the inner surface of the stainless steel pipe to obtain a stainless steel pipe with a clean inner surface;
step S3: homogenizing heat treatment: putting the magnesium alloy into a heating furnace, and preserving heat for 6 hours at 300 ℃ to carry out homogenization treatment;
step S4: uniformly coating a lubricant on the surface of the magnesium alloy;
step S5: after the magnesium alloy bar is inserted into the stainless steel pipe, flattening the two ends of the stainless steel pipe by using a press machine, and completely sealing the magnesium alloy bar inside the steel pipe;
step S6: putting the sealed sample into a heating furnace for heat preservation treatment;
step S7: carrying out single-pass rolling on the heated sample;
step S8: and (4) after air cooling, taking out the magnesium alloy plate in the sample by using linear cutting.
2. The method of making a single pass, high reduction magnesium alloy sheet material of claim 1, wherein the lubricant is boron nitride according to S4.
3. The method for preparing a single-pass magnesium alloy sheet with large reduction according to claim 1, wherein according to S5, the length of the magnesium alloy bar = the length of the stainless steel tube-10 cm; the inner surface of the press is in full contact with the surface of the steel pipe.
4. The method for preparing the single-pass magnesium alloy sheet with large reduction according to claim 1, wherein the temperature of the heating furnace is 350-380 ℃ according to S6.
5. The method for preparing the magnesium alloy sheet with the single pass and the large reduction according to claim 1, wherein the heat preservation time is 30-40 min according to S6.
6. The method for preparing a single-pass large-reduction magnesium alloy sheet according to claim 1, wherein the reduction of the rolling is 70% to 80% according to S7.
7. The method for preparing the single-pass magnesium alloy sheet with large reduction according to claim 1, wherein the rolling line speed is 500mm/S to 1000mm/S according to S7.
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