CN103388116B - Method for effectively rolling Mg-Al-Zn magnesium alloys - Google Patents
Method for effectively rolling Mg-Al-Zn magnesium alloys Download PDFInfo
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- CN103388116B CN103388116B CN201310346840.9A CN201310346840A CN103388116B CN 103388116 B CN103388116 B CN 103388116B CN 201310346840 A CN201310346840 A CN 201310346840A CN 103388116 B CN103388116 B CN 103388116B
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Abstract
The invention discloses a method for effectively rolling Mg-Al-Zn magnesium alloys. The method comprises the following steps: panel surface treatment; panel heating and insulating; roll heating and insulating; and rolling and cooling. The panel is an Mg-Al-Zn magnesium alloy panel. In the panel heating and insulating step, the insulating temperature is 450-550 DEG C, and the insulating time is 30-40 minutes. In the rolling step, the panel is rolled and formed in one step, wherein the rolling reduction of rolling is 50-60%. In the roll heating and insulating step, the insulating temperature is 300-400 DEC, and the insulating time is 10-20 minutes. According to the efficient magnesium alloy high temperature rolling process disclosed by the invention, the panel is processed and formed by single pass, so that the production cost is lowered and the processing period is short. The method is suitable for continuous large-scale rolling production of magnesium alloy panels. The panel rolled by the method disclosed by the invention is excellent in performance, free from remarkable edge cracks and high in yield.
Description
Technical field
The present invention relates to a kind of magnesium alloy working method, particularly a kind of method of efficient rolling Mg-Al-Zn series magnesium alloy.
Background technology
Magnesium alloy as the lightest commercial metal structured material, conventional magnesium alloy 30-50% lighter than aluminium alloy, lighter than iron and steel by more than 70%, can greatly alleviate structural part weight.Simultaneously, magnesium alloy has specific tenacity, specific rigidity is high, damping capacity is excellent, mechanical workout is convenient, be easy to recycle, there is the characteristics such as environmental protection, be described as " 21 century green engineering structural metallic materials ", be widely used in fields such as automobile, track traffic, aerospace, household electrical appliances and 3C, there is important commercial application value.
According to the difference of the mode of production, magnesium alloy is divided into cast magnesium alloys and the large class of wrought magnesium alloys two.Cast magnesium alloys coarse grains, component segregation is serious, and poor-performing, is difficult to meet application demand.In this case, adopt the wrought magnesium alloys product of the plastic working technique such as extruding, rolling, forging productions, owing to having better mechanical property, diversified structure and more and more coming into one's own.Wherein, rolling obtains significant progress as the important means of magnesium alloy plastic working, creates multiple rolling method.
First the technique of existing commercial rolling magnesium alloy carry out long term annealing process to magnesium alloy plate, then preheating magnesium alloy plate between 150-330 DEG C; Finally carry out light reduction multi-pass rolling.Existing method rolling temperature is low, needs to adopt repeatedly rolling, in order to ensure carrying out smoothly of rolling, needing to reheat insulation to sheet material between each rolling pass, greatly reducing production efficiency, increases production cost.
Summary of the invention
In view of this, the invention provides a kind of method of Mg-Al-Zn series magnesium alloy, the method working (machining) efficiency is high, and technique is simple, products obtained therefrom excellent performance.
The method of efficient rolling Mg-Al-Zn series magnesium alloy of the present invention, comprise plate surface process, sheet material heating and thermal insulation, roll heating and thermal insulation, rolling and cooling step, described sheet material is Mg-Al-Zn series magnesium alloy sheet material, in described sheet material heating and thermal insulation step, holding temperature is 450-550 DEG C, soaking time is 30-40min, adopt a roll forming in described milling step, roll reduction is 50%-60%.
Further, in described roll heating and thermal insulation step, holding temperature is 300-400 DEG C, and soaking time is 10-20min.
Beneficial effect of the present invention is: before rolling of the present invention, sheet material be heated to 450-550 DEG C and be incubated, and at this moment faster recrystallization occurs in magnesium alloy inside, eliminates unrelieved stress and microdefect, adds sheet material plastic deformation performance; In addition, when this temperature rolling, in magnesium alloy, basal slip, Prismatic slip and conical surface slippage are opened simultaneously, heavy reduction one-pass roller can be carried out shaping, simplify complicated volume complete processing in the past, reduce production cost, shorten the production cycle, be applicable to the extensive continuously Rolling Production of magnesium alloy plate.In addition, before rolling of the present invention, roll is heated to 300-400 DEG C, reduces sheet material with roll and external environment generation heat exchange, especially sheet material edge and environment directly produce heat exchange, avoid rolled parts limit and split phenomenon, the excellent property of products obtained therefrom, split without obvious limit, lumber recovery is high.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is original plate sample appearance pattern;
Fig. 2 is that rolling obtains board samples exterior appearance;
Fig. 3 is the microstructure morphology of embodiment 1 rolling surface;
Fig. 4 is the microstructure morphology of embodiment 2 rolling surface;
Fig. 5 is the microstructure morphology of embodiment 3 rolling surface;
Fig. 6 is the microstructure morphology of embodiment 4 rolling surface.
Embodiment
The present invention will be further described to use embodiment below, and the per-cent in following examples is mass percent.
Embodiment 1:
Selected by the present embodiment, the composition of Mg-Al-Zn series magnesium alloy sample is identical with table 1 embodiment 1, and before processing, alloy sample as shown in Figure 1, and its thickness is 10mm, and long is 100mm, and wide is 85mm.
The method of the present embodiment efficient rolling magnesium alloy comprises the following steps: 1) surface treatment: sample thief also carries out grinding process to sample surfaces, removes the zone of oxidation on surface, makes sample finished surface totally smooth; 2) blank heating: be placed in by sample in process furnace, carries out heating and thermal insulation, and Heating temperature is set as 550 DEG C, be incubated 35min after reaching design temperature, make sample thermally equivalent, and microtexture is changed, remove internal stress, for next step hot rolling is ready; 3) roll heating: install resistive heating device at top and bottom rolls place, breaker roll homogeneous heating, finally makes top and bottom rolls surface arrive 375 DEG C; 4) hot rolling: take out step 2 fast from heat treatment furnace) the middle sample heated, put into preheated milling train and be rolled, regulating roll location to be roll reduction is 50%; 5) cool: air cooling cooling step 4) gained sample.After rolling processing, as shown in Figure 2, as can be seen from Figure 2, almost there is not limit and split, do not have macroscopic defects loss in sheet material well-tended appearance after roll forming to the macro morphology of sample.
Embodiment 2:
Embodiment 2 and the difference of embodiment 1 are that the formula of embodiment 2 in each element quality proportioning and table 1 in embodiment 2 is identical, and during blank heating, Heating temperature is 525 DEG C, and during roll heating, Heating temperature is 350 DEG C, and during rolling, draught is 52%.
Embodiment 3:
Embodiment 3 and the difference of embodiment 1 are that the formula of embodiment 3 in each element quality proportioning and table 1 in embodiment 3 is identical, and during blank heating, Heating temperature is 500 DEG C, and during roll heating, Heating temperature is 325 DEG C, and during rolling, draught is 54%.
Embodiment 4:
Embodiment 4 and the difference of embodiment 1 are that the formula of embodiment 4 in each element quality proportioning and table 1 in embodiment 4 is identical, and during blank heating, Heating temperature is 475 DEG C, and during roll heating, Heating temperature is 300 DEG C, and during rolling, draught is 58%.
Table 1 embodiment of the present invention sample composition
| Embodiment | Al(%) | Zn(%) | Mn(%) | Si(%) | Mg(%) |
| Embodiment 1 | 2.96 | 0.94 | 0.32 | 0.09 | Surplus |
| Embodiment 2 | 2.96 | 0.94 | 0.32 | 0.09 | Surplus |
| Embodiment 3 | 2.96 | 0.94 | 0.32 | 0.09 | Surplus |
| Embodiment 4 | 3.41 | 1.32 | 0.42 | 0.06 | Surplus |
Analyze below in conjunction with the performance of experimental data to the magnesium alloy of embodiment 1-4 institute rolling.
1, microtexture characterizes: the rolled sample of Example 1-4, adopts 600#, 800#, 1000# and 1200# silicon carbide silicon carbide paper flattened surface successively; Then picric acid-Glacial acetic acid etching reagent corrosion is adopted; After sample etches, laser confocal microscope (LEXT) is adopted to take metallograph, respectively as seen in figures 3-6.
Can be seen by Fig. 3-6, embodiment rolling products obtained therefrom microtexture is even, and average grain size is less, without microtexture defects such as composition segregations.In addition, owing to producing dynamic recrystallization in the operation of rolling, occurred the much crystal grain being of a size of 1-3 μm around crystal grain larger in figure, these small-size grains can promote material mechanical performance significantly.
2, Mechanics Performance Testing: according to the standard of GB GB228-2002, is processed into standard tensile specimen by magnesium alloy rolling plates described in the embodiment of the present invention and carries out tension test.Intercept tension specimen along rolling direction, measured mechanical property is in table 2.
The mechanical property of table 2 embodiment rolled sample
| Embodiment | Yield strength/Mpa | Tensile strength/Mpa | Unit elongation |
| Embodiment 1 | 178 | 272 | 10.1% |
| Embodiment 2 | 181 | 273 | 9.7% |
| Embodiment 3 | 190 | 271 | 7.1% |
| Embodiment 4 | 192 | 272 | 5.9% |
As can be seen from Table 2, the magnesium alloy plate using the rolling of this technique to obtain, has good mechanical property, and its performance reaches the plate property required by ASTMB90/B90M-07 standard.
The technique of efficient rolling magnesium alloy of the present invention, adopt single track high temperature time roll forming, simplify in the past complicated complete processing, production cost is low, and the process-cycle is short, is applicable to the extensive continuously Rolling Production of magnesium alloy plate.The product good mechanical performance of rolling gained, split without obvious limit, lumber recovery is high.
Finally, it is pointed out that above embodiment is just unrestricted for illustration of the present invention, in fact, method of the present invention is applicable equally to the magnesium alloy of other series; When those skilled in the art only simply replace rolled products under the teachings of the present invention, still belong to protection scope of the present invention.
Claims (1)
1. the method for an efficient rolling Mg-Al-Zn series magnesium alloy, comprise plate surface process, sheet material heating and thermal insulation, roll heating and thermal insulation, rolling and cooling step, it is characterized in that: described sheet material is Mg-Al-Zn series magnesium alloy sheet material, in described sheet material heating and thermal insulation step, holding temperature is 450-550 DEG C, soaking time is 30-40min, a roll forming is adopted in described milling step, roll reduction is 50%-60%, rolling deformation temperature is at 450-550 DEG C, in described roll heating and thermal insulation step, holding temperature is 300-400 DEG C, and soaking time is 10-20min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104259201A (en) * | 2014-07-24 | 2015-01-07 | 重庆大学 | Method for rolling high-ductility and high-scalability Mg-Al series magnesium alloy plates |
| CN104607466A (en) * | 2015-01-14 | 2015-05-13 | 大连理工大学 | Hot rolling machining method for high indoor temperature plastic magnesium alloy plate |
| CN113770175A (en) * | 2021-09-30 | 2021-12-10 | 重庆大学 | Method for rolling magnesium alloy plate without edge cracking at low temperature and large pass reduction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1596159A (en) * | 2002-06-05 | 2005-03-16 | 住友电工钢铁电缆株式会社 | Magnesium alloy plate and method for production thereof |
| CN101462123A (en) * | 2009-01-09 | 2009-06-24 | 清华大学 | Method for preparing high-performance magnesium alloy sheet |
| CN102000695A (en) * | 2010-09-21 | 2011-04-06 | 重庆大学 | Rolling method of sheet metal |
| CN102485929A (en) * | 2010-12-03 | 2012-06-06 | 北京有色金属研究总院 | High-strength heat-resisting magnesium alloy containing Ce-rich misch metal and Gd and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005113235A (en) * | 2003-10-09 | 2005-04-28 | Toyota Motor Corp | High strength magnesium alloy, and its production method |
| KR20100106137A (en) * | 2009-03-23 | 2010-10-01 | 주식회사 지알로이테크놀로지 | Mg-zn base wrought magnesium alloys having superior formability at a high strain rate and low temperature and manufacturing method of the alloy sheet |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1596159A (en) * | 2002-06-05 | 2005-03-16 | 住友电工钢铁电缆株式会社 | Magnesium alloy plate and method for production thereof |
| CN101462123A (en) * | 2009-01-09 | 2009-06-24 | 清华大学 | Method for preparing high-performance magnesium alloy sheet |
| CN102000695A (en) * | 2010-09-21 | 2011-04-06 | 重庆大学 | Rolling method of sheet metal |
| CN102485929A (en) * | 2010-12-03 | 2012-06-06 | 北京有色金属研究总院 | High-strength heat-resisting magnesium alloy containing Ce-rich misch metal and Gd and manufacturing method thereof |
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