CN102154597A - Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip - Google Patents
Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip Download PDFInfo
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- CN102154597A CN102154597A CN2011100434971A CN201110043497A CN102154597A CN 102154597 A CN102154597 A CN 102154597A CN 2011100434971 A CN2011100434971 A CN 2011100434971A CN 201110043497 A CN201110043497 A CN 201110043497A CN 102154597 A CN102154597 A CN 102154597A
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Abstract
The invention relates to a processing method for refining crystal grains and improving texture of double surface layers of a magnesium alloy plate strip. In the method, the magnesium alloy plate strip is arranged between at least two groups of bending rolls which are stacked up and down and staggered mutually at the temperature of between 250 and 400 DEG C; the magnesium alloy plate strip is driven to move towards one direction for at least one pass, and when passing through the bending rolls, the magnesium alloy plate strip are bent and deformed, so the magnesium alloy plate strip of which the crystal grains of the double surface layers are refined and the texture is improved is prepared. In the deformation process, large strain is accumulated on the upper and lower surface layers of the plate strip due to repeated stretching and compression, and dynamic recrystallization is induced at middle and high temperature, so that the crystal grains of the double surface layers of the plate strip are refined; and the surface layers are subjected to shear stress, so that a basal plane deflects to improve the original texture. In the method, a process design is reasonable, and equipment is simple and convenient to operate, can be matched with the conventional processing equipment for magnesium alloy, has high processing efficiency and can improve the rigidity and ductility of the double surface layers of the magnesium alloy plate strip effectively and improve the subsequent processing performance of the magnesium alloy plate strip; and large-scale industrial production is easy to realize.
Description
Technical field
The invention discloses the working method that two surface layer grain refinements of a kind of magnesium alloy board and texture are improved, belong to the magnesium alloy processing technique field.
Background technology
It is low that magnesium alloy has density, and specific tenacity and specific rigidity height, effectiveness are good, the antidetonation shock attenuation ability strong and be easy to advantage such as recycling, are with a wide range of applications in fields such as Aeronautics and Astronautics, automobile, 3C Product and military projects.But, magnesium alloy belongs to close-packed hexagonal structure, there is intensive plate texture in rolling, the sheet material that is squeezed into or the band, this texture is difficult to alleviate and eliminate by annealing process and conventional deformation technique, further be easy to produce various defectives in the distortion, thereby seriously limiting its secondary deformation ability.For satisfying fields such as aviation, automobile to light-weighted high request, extensive application has become a kind of trend as Abdeckteil with magnesium alloy, therefore be necessary to provide a kind of and improve magnesium alloy board texture, and improve its intensity and ductile working method synchronously, to improve its processability.
As everyone knows, crystal grain thinning can improve the intensity and the hardness of material.The wear resistance that the surface layer grain refinement can not only improve material can also suppress the germinating of crackle effectively, thereby improves the service life of material.There are a lot of methods can realize the surface layer grain refinement at present, as friction stir processing (FSP), high energy shot-peening (HESP) and surface mechanical attrition (SMAT) etc., but these methods all are single surface layer grain thinning methods, and to the equipment requirements height, efficient is low, is unfavorable for saving cost.By experiment, the present invention proposes the working method of the two surface layer grain refinements of a kind of magnesium alloy plate and belt, and the equipment that this method is used is simple, is easy to realize large-scale industrial production.
Summary of the invention
The objective of the invention is to solve the deficiency of prior art and to propose a kind of technological design reasonable, simple to operate, be out of shape two surface layer grain refinements of magnesium alloy board that come the two surface layer grains of refinement strip and improve original texture and the working method that texture is improved by under middle and high temperature, magnesium alloy board being carried out two-way alternating bending, reach the purpose that improves the magnesium alloy board performance.
The working method that two surface layer grain refinements of magnesium alloy board of the present invention and texture are improved is to adopt following technical proposals to realize:
Magnesium alloy board is heated to 250～400 ℃, place between stacked, the interlaced up and down bending roll of at least two groups, drive magnesium alloy board to direction motion at least 1 passage, occur bending and deformation during strip process bending roll, making the radius of curvature R of strip and ratio R/t of thickness of slab t is 2～10; Promptly make the magnesium alloy board that two surface layer grain refinements and texture are improved.
In the working method that two surface layer grain refinements of magnesium alloy board of the present invention and texture are improved, described magnesium alloy board is 1～30 time to the road number of times of a direction motion.
In the working method that two surface layer grain refinements of magnesium alloy board of the present invention and texture are improved, the distance between the described same group of bending roll is: 2r≤L≤4r, r are described bending roll radius; Vertical range between described up and down two groups of bending rolls is: 1.5r≤h≤2r.
In the working method that two surface layer grain refinements of magnesium alloy board of the present invention and texture are improved, described magnesium alloy board moves through driving roll to a direction and drives.
The present invention is by carrying out the two-way alternating bending distortion of multi-pass to magnesium alloy board under 250～400 ℃ middle and high temperature, make the two top layers of strip that dynamic recrystallization take place, realize the two surface layer grain refinements of strip, improve the original texture of strip, thereby improve two surface hardnesses of magnesium alloy board and ductility, improve the properties for follow of strip, its mechanism and advantage are summarized as follows:
In the two-way alternating bending process of multi-pass, magnesium alloy board has been accumulated very big strain because of bearing stretching and compression set repeatedly in the top layer up and down, is easy to bring out dynamic recrystallization under middle and high temperature, the two surface layer grains of refinement strip; Simultaneously, owing to when bending, have stronger shear-stress in the strip, and the dynamic recrystallization that under this stress, forms, basal plane will deflect.Therefore, adopt this method not only effectively the two surface layer grains of refinement magnesium alloy board can also improve its original texture, thereby improve two surface hardnesses of strip and ductility, improve the properties for follow of magnesium alloy board.
In sum, technological design of the present invention is rationally, use equipment is simple, easy to operate, can with the supporting use of the conventional processing units of existing magnesium alloy, the working (machining) efficiency height is easily realized large-scale industrial production.
Description of drawings
Accompanying drawing 1 is the optical texture on top layer, AZ31 magnesium alloy plate distortion back in the embodiment of the invention 1.
Accompanying drawing 2 is the optical texture after the distortion of AZ61 magnesium alloy plate in the embodiment of the invention 2.
Accompanying drawing 3 (a) is magnesium alloy plate top layer (1000) utmost point figure of the embodiment of the invention 2;
Accompanying drawing 3 (b) is magnesium alloy plate middle layer (1000) utmost point figure of the embodiment of the invention 2.
Accompanying drawing 4 (a) is the optical texture on top layer, AZ61 magnesium alloy plate distortion back in the embodiment of the invention 3.
Accompanying drawing 4 (b) is the optical texture in middle layer, AZ61 magnesium alloy plate distortion back in the embodiment of the invention 3.
Fig. 5 is for implementing the inventive method synoptic diagram.
Wherein:
In the accompanying drawing 2,21-top layer, 22-middle layer, another top layer of 23-;
In the accompanying drawing in 5,1-magnesium alloy board, 2,3,4, the 5-bending roll, 6,7,8, the 9-driving roll.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
Under 250 ℃, the AZ31 magnesium alloy plate is carried out two-way alternating bending.At first, the AZ31 plate is placed between one group of bending roll, adjust up and down the distance h=1.8r between two groups of bending rolls, distance L=the 3.8r of same group of bending roll, making the radius of curvature R of strip and ratio R/t of thickness of slab t is 9, drive strip to a direction motion a time by driving roll then, strip is occured bending and deformation through bending roll the time.Repeat above-mentioned steps, the controlled deformation passage is 30 times.By accompanying drawing 1 as can be known: after the two-way alternating bending, the sheet material surface layer grain is refined to below the 1 μ m, and microlite integration number is up to 90%.
Embodiment 2:
Under 350 ℃, the AZ61 magnesium alloy plate is carried out two-way alternating bending.At first, AZ61 sheet material is placed between one group of bending roll, adjust up and down the distance h=1.8r between two groups of bending rolls, distance L=the 2.2r of same group of bending roll, making the radius of curvature R of strip and ratio R/t of thickness of slab t is 6.5, drive strip to a direction motion a time by driving roll then, strip is occured bending and deformation through bending roll the time.Repeat above-mentioned steps, the controlled deformation passage is 10 times.By the structure observation of accompanying drawing 2 and 3 and textile analysis as can be known: after the two-way alternating bending, the two surface layer grains of sheet material are refined to below the 3 μ m, and thin crystal layer thickness is 0.6～0.7mm; Obvious deflection takes place in sheet material top layer texture, and (0001) basal plane of most of crystal grain forwards the direction that becomes 30 °～40 ° of angles with the plate face to.
Embodiment 3:
Under 400 ℃, the AZ61 magnesium alloy plate is carried out two-way alternating bending.At first, AZ61 sheet material is placed between two groups of bending rolls, adjust up and down the distance h=1.5r between two groups of bending rolls, distance L=the 3r of same group of bending roll, making the radius of curvature R of strip and ratio R/t of thickness of slab t is 3, drive strip to a direction motion a time by driving roll then, strip is occured bending and deformation through bending roll the time.Repeat above-mentioned steps, the controlled deformation passage is 6 times.By accompanying drawing 4 as can be known: after the distortion, the sheet material surface layer grain is refined to below the 15 μ m.
Claims (4)
1. the working method improved of two surface layer grain refinements of magnesium alloy board and texture, it is characterized in that: magnesium alloy board is heated to 250～400 ℃, place between stacked, the interlaced up and down bending roll of at least two groups, drive magnesium alloy board to direction motion at least 1 passage, occur bending and deformation during strip process bending roll, making the radius of curvature R of strip and ratio R/t of thickness of slab t is 2～10; Promptly make the magnesium alloy board that two surface layer grain refinements and texture are improved.
2. the working method that two surface layer grain refinements of magnesium alloy board according to claim 1 and texture are improved is characterized in that: described magnesium alloy board is 1～30 time to the road number of times of a direction motion.
3. the working method that two surface layer grain refinements of magnesium alloy board according to claim 2 and texture are improved, it is characterized in that: the distance between the described same group of bending roll is: 2r≤L≤4r, r are described bending roll radius; Vertical range between described up and down two groups of bending rolls is: 1.5r≤h≤2r.
4. the working method that two surface layer grain refinements of magnesium alloy board according to claim 3 and texture are improved is characterized in that: described magnesium alloy board moves through driving roll to a direction and drives.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100434971A CN102154597A (en) | 2011-02-22 | 2011-02-22 | Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip |
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| CN2011100434971A CN102154597A (en) | 2011-02-22 | 2011-02-22 | Processing method for refining crystal grains and improving texture of double surface layers of magnesium alloy plate strip |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818369A (en) * | 2015-04-23 | 2015-08-05 | 上海应用技术学院 | Metal sheet surface strengthening process |
| CN104818441A (en) * | 2015-05-13 | 2015-08-05 | 南京工程学院 | Biaxial bending deformation device and processing method for processing welded joint |
| CN104862627A (en) * | 2015-06-16 | 2015-08-26 | 重庆大学 | Method for improving stamping performance of magnesium alloy sheet by continuous bending |
| CN105132653A (en) * | 2015-09-10 | 2015-12-09 | 上海应用技术学院 | Method for reinforcing metal through roll bending and combined deformation |
| CN108817133A (en) * | 2018-04-17 | 2018-11-16 | 河南明镁镁业科技有限公司 | A kind of magnesium alloy texture weakening apparatus and method |
| CN109881130A (en) * | 2019-01-28 | 2019-06-14 | 沈阳理工大学 | Magnesium alloy plate roll bending-Rolling compund deformation method and used roll bending roller |
| CN109943792A (en) * | 2019-04-10 | 2019-06-28 | 湖南科技大学 | A kind of processing method of reinforced magnesium alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009113090A (en) * | 2007-11-08 | 2009-05-28 | Mitsubishi Alum Co Ltd | Method for producing magnesium alloy sheet |
| CN101688270A (en) * | 2007-06-28 | 2010-03-31 | 住友电气工业株式会社 | Magnesium alloy plate |
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2011
- 2011-02-22 CN CN2011100434971A patent/CN102154597A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688270A (en) * | 2007-06-28 | 2010-03-31 | 住友电气工业株式会社 | Magnesium alloy plate |
| JP2009113090A (en) * | 2007-11-08 | 2009-05-28 | Mitsubishi Alum Co Ltd | Method for producing magnesium alloy sheet |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818369A (en) * | 2015-04-23 | 2015-08-05 | 上海应用技术学院 | Metal sheet surface strengthening process |
| CN104818441A (en) * | 2015-05-13 | 2015-08-05 | 南京工程学院 | Biaxial bending deformation device and processing method for processing welded joint |
| CN104862627A (en) * | 2015-06-16 | 2015-08-26 | 重庆大学 | Method for improving stamping performance of magnesium alloy sheet by continuous bending |
| CN104862627B (en) * | 2015-06-16 | 2016-08-24 | 重庆大学 | A kind of continuous bend improves the method for magnesium alloy sheet punching performance |
| CN105132653A (en) * | 2015-09-10 | 2015-12-09 | 上海应用技术学院 | Method for reinforcing metal through roll bending and combined deformation |
| CN108817133A (en) * | 2018-04-17 | 2018-11-16 | 河南明镁镁业科技有限公司 | A kind of magnesium alloy texture weakening apparatus and method |
| CN109881130A (en) * | 2019-01-28 | 2019-06-14 | 沈阳理工大学 | Magnesium alloy plate roll bending-Rolling compund deformation method and used roll bending roller |
| CN109943792A (en) * | 2019-04-10 | 2019-06-28 | 湖南科技大学 | A kind of processing method of reinforced magnesium alloy |
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Application publication date: 20110817 |