CN105234173A - Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip - Google Patents
Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip Download PDFInfo
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- CN105234173A CN105234173A CN201510788181.3A CN201510788181A CN105234173A CN 105234173 A CN105234173 A CN 105234173A CN 201510788181 A CN201510788181 A CN 201510788181A CN 105234173 A CN105234173 A CN 105234173A
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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Abstract
The invention discloses a rolling machining method for improving the microstructure texture and the mechanical property of a magnesium alloy sheet strip. Cooling continuous rolling is carried out on a magnesium alloy cogging panel, wherein the rolling starting temperature ranges from 250 DEG C to 500 DEG C, the number of continuous rolling times is two to eight, and one-time rolling reduction ranges from 2% to 20%; 200 DEG C-450 DEG C intermediate annealing is carried out after continuous rolling, wherein the annealing time ranges from 1 min to 60 min; and then the cooling continuous rolling step is repeatedly executed until the thickness of a magnesium alloy sheet reaches the needed size. According to the rolling machining method, through a cooling continuous rolling technology, base face slippage, taper face slippage and twinborn and grain boundary slippage can be started at the same time in the rolling process of the magnesium alloy sheet strip; meanwhile, the continuous rolling process facilitates grain accumulation coordinated deflection, and the base face texture inclines and is weakened; and the grain size of the magnesium alloy sheet strip is controllable through combination of the annealing process, and the mechanical property of a magnesium alloy is obviously improved.
Description
Technical field
The present invention relates to a kind of processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, particularly a kind of rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property.
Background technology
Magnesium alloy is as the lightest structural metallic materials, there is high specific strength, specific stiffness, good heat conduction, electric conductivity, and the advantage such as damping shock absorption, electromagnetic shielding, easily recovery, in fields such as automobile, electronic communication, energy-saving and emission-reduction, losss of weight, there is prospects for commercial application widely.Rolling is the plastic working mode of a kind of efficient, the low cost of producing metal material Strip.Metal alloy Strip is not only plastic worked article, also can be used as the raw material of secondary operations simultaneously.Therefore, the magnesium alloy plate and belt of developing low-cost, high-quality, has great importance to the commercial Application of magnesium alloy.
But, because pure magnesium and alloy thereof are Patterns for Close-Packed Hexagonal Crystal structure, and c/a axial ratio is close to 1.63, cause it when lower temperature (temperature is lower than 498K), mainly <a> slippage starts, independently slip system is few, and the plastic deformation of near room temperature is mainly coordinated by twin, and plastic deformation ability is poor.Magnesium alloy plate reduction in pass in the operation of rolling of tradition rolling is little, and easy limit is split, and yield rate is low, needs frequently to carry out intermediate annealing between passage, and sheet material preparation cost is higher.Meanwhile, hot rolling cogging plate forms very strong basal plane texture usually, and namely crystal grain basal plane parallels with the sheet material face of rolling, thus causes finished product sheet material to have stronger anisotropy, and following process distortion and application will be very restricted.Therefore, weaken magnesium alloy plate and belt basal plane texture, it is very necessary for reducing its Anisotropy, improving the processing method of its plastic forming ability.
Summary of the invention
The object of the invention is to, a kind of rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property is provided.The present invention, by the basal plane texture adopting cooling continuous rolling technology to control magnesium alloy plate and belt finish to gauge plate, reaches and weakens basal plane texture, realize the object of magnesium alloy plate and belt grain refinement and mechanical property raising in conjunction with annealing process.
Technical scheme of the present invention: a kind of rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, cooling continuous rolling is carried out to magnesium alloy cogging plate, wherein start rolling temperature is 250-500 DEG C, and continuous rolling number of times is 2-8 passage, and single pass drafts is 2-20%; Carry out 200-450 DEG C of intermediate annealing after continuous rolling, annealing time is 1-60min, then repeats aforesaid cooling continuous rolling, until the thickness of magnesium alloy plate reaches required size.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, described start rolling temperature is 300-400 DEG C, and described continuous rolling number of times is 2-6 time, and single pass drafts is 3-15%, described intermediate anneal temperature is 250-400 DEG C, and annealing time is 5-45min.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, described start rolling temperature is 350-400 DEG C, and described continuous rolling number of times is 2-4 time, and single pass drafts is 5-10%, described intermediate anneal temperature is 350 DEG C, and annealing time is 15-30min.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, described cooling continuous rolling mode is symmetric rolling or asymmetrical rolling, and rolling pathway is unidirection rolling, tandem rolling or multidirectional rolling.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, described cooling continuous rolling mode is asymmetrical rolling.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, the friction speed of described asymmetrical rolling is than being 1.1-1.5.
The aforesaid rolling processing method improving magnesium alloy plate and belt microstructure texture and mechanical property, the friction speed ratio of described asymmetrical rolling is 1.5.
Beneficial effect of the present invention: the present invention is by cooling continuous rolling technology, make magnesium alloy board can open basal slip, conical surface slippage, twin and Grain Boundary Sliding in the operation of rolling simultaneously, simultaneously, continuous rolling process is conducive to grains accumulated and coordinates deflection, basal plane texture is verted, reduce basal plane texture, achieve magnesium alloy plate and belt crystallite dimension in conjunction with annealing process controlled, significantly improve the mechanical property of magnesium alloy.
Applicant carried out following experiments, the effective effect of provable tool of the present invention:
The present invention has 3 embodiments, all utilizes method of the present invention to be rolled processing to the AZ31B magnesium alloy hot rolling slab of equal state.The initial basal plane texture intensity maximum of hot rolling slab is 7.795 (Fig. 1), the average grain size that division lines method records about 42 μm (Fig. 4).
In embodiment 1, after two-wheeled 4 passage cooling continuous rolling being carried out to the hot rolling slab that 7mm is thick by adopting one-way synchronization rolling, obtain finish to gauge plate { 0001} marcotexture is shown in accompanying drawing 2, and maximum intensity is 5.296, and basal plane texture intensity reduces.
In embodiment 2, after two-wheeled 2 passage cooling continuous rolling being carried out to the hot rolling slab that 4mm is thick by adopting unidirectional asymmetrical rolling, obtain finish to gauge plate { 0001} marcotexture is shown in accompanying drawing 3, and maximum intensity is 5.446, and basal plane texture intensity reduces.
In embodiment 1 and embodiment 2, the test result of rolling plate of preparation shows, adopts processing method of the present invention to be conducive to weakening AZ31 magnesium alloy plate basal plane texture.
In embodiment 3, by carrying out 250 DEG C × 1h to three blocks that prepare through the method different plates that roll, 300 DEG C × 1h, the final annealing process of 350 DEG C × 1h, and be 1 by the sample number consecutively obtained, 2, 3, specimen coding 1, 2, the crystallite dimension of rolling plate of 3 and mechanical property (GB-T5154-2010) are distinguished as shown in table 2, its microscopic structure and room temperature simple tension load-deformation curve are respectively as shown in Figure 5 and Figure 6, division lines method is adopted to measure 1, 2 and No. 3 sample crystallite dimensions are respectively 5.6 μm, 9.5 μm and 13.2 μm, tensile strength is respectively 275.2MPa, 261.2MPa, 259.7MPa, elongation after fracture is respectively 21.8%, 24.2%, 22.9%, obtain the magnesium alloy plate that intensity and plasticity are improved all simultaneously.For ease of comparing, the machining state of the AZ31B plate that traditional milling method obtains and room-temperature mechanical property (GB-T5154-2010) thereof list in table 1.From table 1, even if in the good annealed state of plasticity (O), the elongation after fracture of AZ31 magnesium alloy is only 12%, and tensile strength is 225MPa.Compared by the plate that rolls obtained with traditional milling method, the tensile strength of 1,2, No. 3 different annealed state sample (in table 2) adopting the processing method of the embodiment of the present invention 3 to prepare improves nearly 35-50MPa, and its elongation after fracture all reaches more than 20%.
The room-temperature mechanical property (GB-T5154-2010) of the traditional AZ31B plate of table 1
Table 2 adopts the room-temperature mechanical property (GB-T5154-2010) of the different annealed state of this rolling processing method AZ31B plate
Accompanying drawing explanation
Accompanying drawing 1 is before rolling of the present invention, the X-ray pole figure of initial hot rolling slab;
The X-ray pole figure of hot rolled plate after the method rolling of the embodiment of the present invention 1 of accompanying drawing 2 to be original depths be 7mm;
The X-ray pole figure of hot rolled plate after the method rolling of the embodiment of the present invention 2 of accompanying drawing 3 to be original depths be 4mm;
Accompanying drawing 4 is before adopting rolling of the present invention, the metallographic microstructure of initial hot rolling slab;
The metallographic microstructure that in the corresponding table 2 of (1), (2), (3) difference in accompanying drawing 5,1,2, No. 3 sample is corresponding;
The room temperature simple tension load-deformation curve of 1,2, No. 3 sample in the corresponding table 2 of 1#, 2#, 3# curve difference in accompanying drawing 6.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated, but not as the foundation limited the present invention.
Embodiment 1:
AZ31 magnesium alloy hot rolling cogging plate, { 0001} pole figure as shown in Figure 1 for its marcotexture.Macroscopical pole figure of Fig. 1 shows that hot rolling slab has comparatively strong basis plane texture, and maximum intensity is 7.795.Open plate to the original depth AZ31 magnesium alloy hot rolling slab that is 7mm and carry out continuous cooling rolling, rolling pathway is one-way synchronization rolling, and wherein start rolling temperature is 400 DEG C, and continuous rolling number of times is 4 passages, and single pass drafts is about 5%; Carry out 350 DEG C of intermediate annealings after continuous rolling, annealing time is 30min, then repeats aforesaid continuous cooling rolling, until the thickness of magnesium alloy plate reaches required size.
Embodiment 2:
Original depth is the AZ31 magnesium alloy hot rolling cogging plate of 4mm, and { 0001} pole figure as shown in Figure 1 for its marcotexture.Macroscopical pole figure of Fig. 1 shows that hot rolling slab has comparatively strong basis plane texture, and maximum intensity is 7.795.Open plate to AZ31 magnesium alloy hot rolling slab and carry out continuous cooling rolling, rolling pathway is unidirectional asymmetrical rolling (friction speed is than being 1.1-1.5), and start rolling temperature is 350 DEG C, and continuous rolling number of times is 2 passages, and single pass drafts is about 10%; Carry out 350 DEG C of intermediate annealings after continuous rolling, annealing time is 15min, then repeats aforesaid continuous cooling rolling, until the thickness of magnesium alloy plate reaches required size.
Embodiment 3:
Original depth is that the AZ31 magnesium alloy hot rolling cogging plate of 4mm carries out cooling continuous rolling, rolling pathway is multidirectional rolling, and rolling mode is asymmetrical rolling (friction speed ratio is 1.5), and wherein start rolling temperature is 400 DEG C, continuous rolling number of times is 4 passages, and single pass drafts is about 5%; 350 DEG C of intermediate annealings are carried out after continuous rolling, annealing time is 15min, then repeat once aforesaid cooling continuous rolling, obtain the rolled plate of overall reduction about 40%, this is rolled to state sheet material and carries out 250 DEG C × 1h, 300 DEG C × 1h, the final annealing process of 350 DEG C × 1h.
Claims (7)
1. one kind is improved the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property, it is characterized in that: cooling continuous rolling is carried out to magnesium alloy cogging plate, wherein start rolling temperature is 250-500 DEG C, and continuous rolling number of times is 2-8 passage, and single pass drafts is 2-20%; Carry out 200-450 DEG C of intermediate annealing after continuous rolling, annealing time is 1-60min, then repeats aforesaid cooling continuous rolling, until the thickness of magnesium alloy plate reaches required size.
2. improve the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property as claimed in claim 1, it is characterized in that: described start rolling temperature is 300-400 DEG C, described continuous rolling number of times is 2-6 time, single pass drafts is 3-15%, described intermediate anneal temperature is 250-400 DEG C, and annealing time is 5-45min.
3. improve the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property as claimed in claim 2, it is characterized in that: described start rolling temperature is 350-400 DEG C, described continuous rolling number of times is 2-4 time, single pass drafts is 5-10%, described intermediate anneal temperature is 350 DEG C, and annealing time is 15-30min.
4. the improvement magnesium alloy plate and belt microstructure texture as described in claim 1,2 or 3 and the rolling processing method of mechanical property, it is characterized in that: described cooling continuous rolling mode is symmetric rolling or asymmetrical rolling, rolling pathway is unidirection rolling, tandem rolling or multidirectional rolling.
5. improve the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property as claimed in claim 4, it is characterized in that: described cooling continuous rolling mode is asymmetrical rolling.
6. improve the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property as claimed in claim 5, it is characterized in that: the friction speed of described asymmetrical rolling is than being 1.1-1.5.
7. improve the rolling processing method of magnesium alloy plate and belt microstructure texture and mechanical property as claimed in claim 6, it is characterized in that: the friction speed ratio of described asymmetrical rolling is 1.5.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817479A (en) * | 2016-03-18 | 2016-08-03 | 成都青元泛镁科技有限公司 | Rolling method for magnesium alloy sheet |
| CN108787781A (en) * | 2017-04-26 | 2018-11-13 | 中国宝武钢铁集团有限公司 | A method of manufacture high quality magnesium alloy plate, volume |
| CN110157933A (en) * | 2019-06-25 | 2019-08-23 | 西安建筑科技大学 | A kind of high-strength wearable No yield point graphene/Ti2The preparation method of AlNb composite material |
| CN110819921A (en) * | 2019-11-25 | 2020-02-21 | 重庆理工大学 | Method for changing texture of magnesium alloy plate |
| CN111069285A (en) * | 2019-11-18 | 2020-04-28 | 东北大学 | Asynchronous hot continuous rolling method for preparing hot-rolled extremely-thin steel strip |
| CN112481536A (en) * | 2020-11-04 | 2021-03-12 | 长沙新材料产业研究院有限公司 | Magnesium alloy thick plate and preparation method thereof |
| CN112808772A (en) * | 2019-12-25 | 2021-05-18 | 中南大学 | Rolling forming method for optimizing microstructure and mechanical property of magnesium alloy plate |
| CN113943907A (en) * | 2021-10-14 | 2022-01-18 | 安徽工业大学 | Preparation method of magnesium alloy plate strip with gradient heterogeneous structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817479A (en) * | 2016-03-18 | 2016-08-03 | 成都青元泛镁科技有限公司 | Rolling method for magnesium alloy sheet |
| CN108787781A (en) * | 2017-04-26 | 2018-11-13 | 中国宝武钢铁集团有限公司 | A method of manufacture high quality magnesium alloy plate, volume |
| CN110157933A (en) * | 2019-06-25 | 2019-08-23 | 西安建筑科技大学 | A kind of high-strength wearable No yield point graphene/Ti2The preparation method of AlNb composite material |
| CN110157933B (en) * | 2019-06-25 | 2020-11-06 | 西安建筑科技大学 | Preparation method of high-strength wear-resistant non-oriented graphene/Ti 2AlNb composite material |
| CN111069285A (en) * | 2019-11-18 | 2020-04-28 | 东北大学 | Asynchronous hot continuous rolling method for preparing hot-rolled extremely-thin steel strip |
| CN110819921A (en) * | 2019-11-25 | 2020-02-21 | 重庆理工大学 | Method for changing texture of magnesium alloy plate |
| CN112808772A (en) * | 2019-12-25 | 2021-05-18 | 中南大学 | Rolling forming method for optimizing microstructure and mechanical property of magnesium alloy plate |
| CN112481536A (en) * | 2020-11-04 | 2021-03-12 | 长沙新材料产业研究院有限公司 | Magnesium alloy thick plate and preparation method thereof |
| CN113943907A (en) * | 2021-10-14 | 2022-01-18 | 安徽工业大学 | Preparation method of magnesium alloy plate strip with gradient heterogeneous structure |
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Application publication date: 20160113 |