CN102965604A - Method for preparing AZ31B magnesium alloy sheets - Google Patents
Method for preparing AZ31B magnesium alloy sheets Download PDFInfo
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- CN102965604A CN102965604A CN2012104738237A CN201210473823A CN102965604A CN 102965604 A CN102965604 A CN 102965604A CN 2012104738237 A CN2012104738237 A CN 2012104738237A CN 201210473823 A CN201210473823 A CN 201210473823A CN 102965604 A CN102965604 A CN 102965604A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005096 rolling process Methods 0.000 claims abstract description 150
- 238000002360 preparation method Methods 0.000 claims abstract description 42
- 238000005097 cold rolling Methods 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims 6
- 238000000265 homogenisation Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000007519 figuring Methods 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
本发明提供了一种AZ31B镁合金薄板的制备方法，包括以下步骤：一、将AZ31B镁合金铸锭进行均匀化处理；二、将均匀化处理后的AZ31B镁合金铸锭送入预热的轧机中轧制，得到一次轧制板坯；三、进行表面修磨处理；四、将表面修磨处理后的一次轧制板坯加热后送入预热的轧机中轧制，得到二次轧制板坯；五、将二次轧制板坯冷轧，得到厚度为0.3mm～0.84mm的AZ31B镁合金薄板。本发明生产工艺简单，生产成本低，生产效率高，工艺过程易于控制；采用本发明制备的AZ31B镁合金薄板表明质量优良，组织均匀；在室温条件下的抗拉强度≥380MPa，屈服强度≥320MPa，伸长率≥8%，具有优良的机械性能。
The invention provides a preparation method of an AZ31B magnesium alloy thin plate, comprising the following steps: 1. homogenizing the AZ31B magnesium alloy ingot; 2. sending the homogenized AZ31B magnesium alloy ingot into a preheated rolling mill Intermediate rolling to obtain a primary rolling slab; 3. Carry out surface grinding treatment; 4. After heating the primary rolling slab after surface grinding treatment, send it to a preheated rolling mill for rolling to obtain a secondary rolling Slab; 5. Cold rolling the secondary rolling slab to obtain an AZ31B magnesium alloy sheet with a thickness of 0.3 mm to 0.84 mm. The invention has the advantages of simple production process, low production cost, high production efficiency, and easy control of the process; the AZ31B magnesium alloy thin plate prepared by the invention shows good quality and uniform structure; the tensile strength at room temperature is ≥380MPa, and the yield strength is ≥320MPa , Elongation ≥ 8%, with excellent mechanical properties.
Description
Technical field
The invention belongs to the magnesium alloy materials processing technique field, be specifically related to a kind of preparation method of AZ31B magnesium alloy sheet.
Background technology
Magnesium and magnesium alloy are the lightest present structural metallic materialss, have the advantages such as density is low, specific tenacity is high and specific rigidity is high, damping characteristics is good, thermal conductivity is good, effectiveness is good, machinability is good, accessory size is stable, easy recovery, be described as " green structured material of 21 century ".Because be subjected to the restriction of the factors such as material preparation, processing technology, corrosion resistance and price, the magnesium alloy especially application of wrought magnesium alloys lags far behind iron and steel and aluminium alloy in the past few decades always.In recent years, since to automotive light weight technology and environmental requirement improve constantly and the day of the energy is becoming tight and has just excited the very big interest of researchist to magnesium.
Magnesium alloy plate and belt has very widely application prospect in fields such as aerospace, automobile making, household electrical appliances, communications, and wherein magnesium alloy sheet is particularly useful for the shell processing of the products such as mobile telephone, notebook computer, digital camera, the miniature portability videocorder of MD.Along with the development of 3C industry, the demand of magnesium alloy sheet will get more and more.Yet there are two restraining factors in the magnesium alloy plate development: the one, and the temperature-room type plasticity deformability of most of magnesium alloy is relatively poor; The 2nd, magnesium alloy plate preparation technology is not mature enough, and mechanical property needs further to improve.
The close-packed hexagonal structure of magnesium has determined that its temperature-room type plasticity deformability is relatively poor, and conventional rolling technology is difficult to produce the magnesium alloy sheet of the following high performance requirements of thickness 0.5mm.There are the problems such as sport technique segment is many, difficulty large, the thin plate performance is not high in casting-rolling technology in thin plate production.Be squeezed the in process of production restriction of base size of " extruding+rolling " method, the thin plate fabric width is limited, and in the processing extrusion process requirement is arranged, and working method is comparatively complicated.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of AZ31B magnesium alloy sheet for above-mentioned the deficiencies in the prior art.The method has been saved the warm-rolling operation in traditional magnesium alloy rolling process, and production technique is more simplified, and production cost reduces greatly, and production efficiency significantly improves, and technological process is easier to control; Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of the method preparation, homogeneous microstructure, the tensile strength 〉=380MPa under room temperature (23 ℃ ± 2 ℃) condition, yield strength 〉=320MPa, elongation 〉=8% has good mechanical property.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of AZ31B magnesium alloy sheet is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 20mm～60mm places resistance furnace with thickness, is to be incubated 15h～24h under 480 ℃～510 ℃ the condition to carry out homogenizing and process in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 150～180 ℃, then first rolling with carrying out in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtains rolled slab one time; The described first rolling pass deformation rate is 30%～40%, and the described first rolling total deformation rate is 85%～90%;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 150 ℃～180 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 400 ℃～450 ℃ resistance furnace, temperature is heated 20min～40min, then a rolled slab after will heating is sent into and is carried out second rollingly in the hot rolls after the preheating, obtains the reroll slab; The described second rolling pass deformation rate is 10%～20%, and the described second rolling total deformation rate is 70%～80%;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rollingly in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.3mm～0.84mm; The described the 3rd rolling pass deformation rate is 5%～10%, and the described the 3rd rolling total deformation rate is 20%～30%.
The preparation method of above-mentioned a kind of AZ31B magnesium alloy sheet is characterized in that, all the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 2～4 passages in first operation of rolling described in the step 2; The temperature of described the first anneal is 480 ℃～510 ℃, and the time of described the first anneal is 15min～30min.
The preparation method of above-mentioned a kind of AZ31B magnesium alloy sheet is characterized in that, all a rolled slab after rolling is carried out the second anneal after every rolling 1～3 passage in second operation of rolling described in the step 4; The temperature of described the second anneal is 400 ℃～450 ℃, and the time of described the second anneal is 10min～20min.
The present invention compared with prior art has the following advantages:
1, the preparation method of a kind of AZ31B magnesium alloy sheet of the present invention, at first the AZ31B magnesium alloy ingot is carried out sending into after homogenizing is processed and carry out the cogging roughing in the milling train after the preheating (pass deformation rate of employing is 30%～40%, total deformation rate is 85%～90%), then (pass deformation rate of employing is 10%～20% directly to carry out hot rolling, total deformation rate is 70%～80%) it is cold rolling again that (pass deformation rate of employing is 5%～10%, total deformation rate is 20%～30%) complete processing, saved the warm-rolling operation in traditional magnesium alloy rolling process, therefore production technique of the present invention is more simplified, production cost reduces greatly, production efficiency significantly improves, and technological process is easier to control.
2, the invention provides the preparation method that a kind of thickness is the AZ31B magnesium alloy sheet of 0.3mm～0.84mm, adopt the AZ31B magnesium alloy sheet of the present invention's preparation to carry out the mechanical property detection according to standard GB/T/T228.1-2010 " metal material stretching test ", record the tensile strength 〉=380MPa of AZ31B magnesium alloy sheet under room temperature (23 ℃ ± 2 ℃) condition of the present invention's preparation, yield strength 〉=320MPa, elongation 〉=8% illustrates that the AZ31B magnesium alloy sheet of the present invention's preparation has good mechanical property.
3, adopt the excellent surface quality of the AZ31B magnesium alloy sheet of the present invention's preparation, homogeneous microstructure.
Below in conjunction with drawings and Examples the present invention is described in further detail.
Description of drawings
Fig. 1 is the microstructure picture of the AZ31B magnesium alloy sheet of the embodiment of the invention 1 preparation.
Fig. 2 is the microstructure picture of the AZ31B magnesium alloy sheet of the embodiment of the invention 3 preparations.
Embodiment
Embodiment 1
The preparation method of the AZ31B magnesium alloy sheet of present embodiment may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 30mm places resistance furnace with thickness, is that insulation 20h carries out homogenizing and processes under 500 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 160 ℃, and then first rolling with what carry out 6 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 3mm; The described first rolling pass deformation rate is respectively: the 35%, 33%, 32%, 30%, 30%, 30%, described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 2 passages in the operation of rolling; The temperature of described the first anneal is 500 ℃, and the time of described the first anneal is 20min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 160 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 425 ℃ resistance furnace, temperature is heated 30min, then a rolled slab after will heating is sent into and is carried out the second rolling of 9 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 0.7mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 15%, 15%, 15%, 15%, 12%, 12%, 12%, described second rolling total deformation rate is 76.7%; All a rolled slab after rolling is carried out the second anneal after every rolling 3 passages in the operation of rolling; The temperature of described the second anneal is 420 ℃, and the time of described the second anneal is 15min.
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.5mm; The described the 3rd rolling pass deformation rate is respectively 10%, 7%, 6%, 5%, 5%, and the described the 3rd rolling total deformation rate is 28.6%.
Adopt the present embodiment preparation the AZ31B magnesium alloy sheet microstructure picture as shown in Figure 1, this AZ31B magnesium alloy sheet homogeneous microstructure as seen from the figure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 396MPa, and yield strength is 335MPa, and elongation is 9.5%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 2
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 20mm places resistance furnace with thickness, is that insulation 24h carries out homogenizing and processes under 480 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 180 ℃, and then first rolling with what carry out 5 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 3mm; The described first rolling pass deformation rate is respectively: the 33%, 33%, 32%, 30%, 30%, described first rolling total deformation rate is 85%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 4 passages in described first operation of rolling; The temperature of described the first anneal is 480 ℃, and the time of described the first anneal is 30min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 180 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 450 ℃ resistance furnace, temperature is heated 20min, then a rolled slab after will heating is sent into and is carried out the second rolling of 9 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 0.75mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 15%, 15%, 15%, 15%, 10%, 10%, 10%, described second rolling total deformation rate is 75%; All a rolled slab after rolling is carried out the second anneal after every rolling 2 passages; The temperature of described the second anneal is 450 ℃, and the time of described the second anneal is 20min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 3 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.6mm; The described the 3rd rolling pass deformation rate is respectively: the 8%, 7%, 6%, the described the 3rd rolling total deformation rate is 20%.
Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of present embodiment preparation, homogeneous microstructure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 408MPa, and yield strength is 352MPa, and elongation is 9.8%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 3
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 38mm places resistance furnace with thickness, is that insulation 24h carries out homogenizing and processes under 510 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 150 ℃, and then first rolling with what carry out 6 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 3.8mm; The described first rolling pass deformation rate is respectively: the 35%, 35%, 31%, 30%, 30%, 30%, described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 4 passages in described first operation of rolling; The temperature of described the first anneal is 510 ℃, and the time of described the first anneal is 15min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 150 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 400 ℃ resistance furnace, temperature is heated 40min, then a rolled slab after will heating is sent into and is carried out the second rolling of 7 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 1.14mm; Described rolling pass deformation rate is respectively: the 20%, 18%, 16%, 16%, 15%, 15%, 10%, described second rolling total deformation rate is 70%; All a rolled slab after rolling is carried out the second anneal after every rolling 1 passage in second operation of rolling described in the step 4; The temperature of described the second anneal is 400 ℃, and the time of described the second anneal is 20min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.8mm; The described the 3rd rolling pass deformation rate is respectively: the 10%, 8%, 6%, 5%, 5%, the described the 3rd rolling total deformation rate is 30%.
Adopt the present embodiment preparation the AZ31B magnesium alloy sheet microstructure picture as shown in Figure 3, this AZ31B magnesium alloy sheet homogeneous microstructure as seen from the figure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 413MPa, and yield strength is 366MPa, and elongation is 9.9%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 4
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 50mm places resistance furnace with thickness, is that insulation 15h carries out homogenizing and processes under 480 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 150 ℃, and then first rolling with what carry out 6 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 5mm; The described first rolling pass deformation rate is respectively 35%, 35%, 31%, 30%, 30%, 30%, and the described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 2 passages in described first operation of rolling; The temperature of described the first anneal is 510 ℃, and the time of described the first anneal is 15min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 150 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 400 ℃ resistance furnace, temperature is heated 40min, then a rolled slab after will heating is sent into and is carried out the second rolling of 10 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 1mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 18%, 16%, 15%, 15%, 12%, 12%, 12%, 10%, described second rolling total deformation rate is 80%; All a rolled slab after rolling is carried out the second anneal after every rolling 3 passages in described second operation of rolling; The temperature of described the second anneal is 400 ℃, and the time of described the second anneal is 20min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.7mm; The described the 3rd rolling pass deformation rate is respectively: the 10%, 8%, 6%, 5%, 5%, the described the 3rd rolling total deformation rate is 30%.
Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of present embodiment preparation, homogeneous microstructure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 405MPa, and yield strength is 354MPa, and elongation is 10.0%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 5
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 21mm places resistance furnace with thickness, is that insulation 24h carries out homogenizing and processes under 480 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 180 ℃, and then first rolling with what carry out 6 passages in the milling train after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 2.1mm; The described first rolling pass deformation rate is respectively: the 35%, 35%, 31%, 30%, 30%, 30%, described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 4 passages in described first operation of rolling; The temperature of described the first anneal is 510 ℃, and the time of described the first anneal is 15min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 180 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 450 ℃ resistance furnace, temperature is heated 40min, then a rolled slab after will heating is sent into and is carried out the second rolling of 10 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 0.42mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 18%, 16%, 15%, 15%, 12%, 12%, 12%, 10%, described second rolling total deformation rate is 80%; All a rolled slab after rolling is carried out the second anneal after every rolling 1 passage in described second operation of rolling; The temperature of described the second anneal is 450 ℃, and the time of described the second anneal is 20min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.3mm; The described the 3rd rolling pass deformation rate is respectively: the 10%, 7%, 5%, 5%, 5%, the described the 3rd rolling total deformation rate is 28.6%.
Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of present embodiment preparation, homogeneous microstructure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 396MPa, and yield strength is 330MPa, and elongation is 9.5%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 6
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 60mm places resistance furnace with thickness, is that insulation 15h carries out homogenizing and processes under 480 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 180 ℃, and then first rolling with what carry out 6 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 6mm; The described first rolling pass deformation rate is respectively: the 40%, 31%, 30%, 30%, 30%, 30%, described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 4 passages in described first operation of rolling; The temperature of described the first anneal is 510 ℃, and the time of described the first anneal is 15min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 180 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 400 ℃ resistance furnace, temperature is heated 40min, then a rolled slab after will heating is sent into and is carried out the second rolling of 10 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 1.2mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 18%, 16%, 15%, 15%, 12%, 12%, 12%, 10%, described second rolling total deformation rate is 80%; All a rolled slab after rolling is carried out the second anneal after every rolling 2 passages in described second operation of rolling; The temperature of described the second anneal is 450 ℃, and the time of described the second anneal is 20min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.84mm; The described the 3rd rolling pass deformation rate is respectively: the 10%, 8%, 6%, 5%, 5%, the described the 3rd rolling total deformation rate is 30%.
Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of present embodiment preparation, homogeneous microstructure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 421MPa, and yield strength is 355MPa, and elongation is 10.1%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
Embodiment 7
The preparation method of the AZ31B magnesium alloy sheet of present embodiment is characterized in that the method may further comprise the steps:
Step 1, being that the AZ31B magnesium alloy ingot of 30mm places resistance furnace with thickness, is that insulation 24h carries out homogenizing and processes under 510 ℃ the condition in temperature;
Step 2, the roll of hot rolls is preheated to temperature is 150 ℃, and then first rolling with what carry out 6 passages in the hot rolls after the AZ31B magnesium alloy ingot after homogenizing is processed is sent into preheating in the step 1, obtaining thickness is the rolled slab of 3mm; The described first rolling pass deformation rate is respectively: the 40%, 31%, 30%, 30%, 30%, 30%, described first rolling total deformation rate is 90%; All the AZ31B magnesium alloy ingot after rolling is carried out the first anneal after every rolling 4 passages in described first operation of rolling; The temperature of described the first anneal is 510 ℃, and the time of described the first anneal is 15min;
Step 3, rolled slab described in the step 2 is carried out figuring of surface process;
Step 4, the roll of hot rolls is preheated to temperature is 180 ℃, a rolled slab after figuring of surface is processed in the step 3 in being 400 ℃ resistance furnace, temperature is heated 40min, then a rolled slab after will heating is sent into and is carried out the second rolling of 7 passages in the hot rolls after the preheating, and obtaining thickness is the reroll slab of 0.9mm; The described second rolling pass deformation rate is respectively: the 20%, 18%, 18%, 16%, 15%, 13%, 10%, described second rolling total deformation rate is 70%; All a rolled slab after rolling is carried out the second anneal after every rolling 2 passages in described second operation of rolling; The temperature of described the second anneal is 450 ℃, and the time of described the second anneal is 15min;
Step 5, the slab of reroll described in the step 4 sent into carry out the 3rd rolling of 5 passages in the cold-rolling mill, obtaining thickness is the AZ31B magnesium alloy sheet of 0.63mm; The described the 3rd rolling pass deformation rate is respectively: the 10%, 8%, 6%, 5%, 5%, the described the 3rd rolling total deformation rate is 30%.
Adopt the excellent surface quality of the AZ31B magnesium alloy sheet of present embodiment preparation, homogeneous microstructure; Its tensile strength under room temperature (23 ℃ ± 2 ℃) condition is 400MPa, and yield strength is 365MPa, and elongation is 9.8%, illustrates to adopt the AZ31B magnesium alloy sheet of present embodiment preparation to have good mechanical property.
The above only is preferred embodiment of the present invention, is not that the present invention is imposed any restrictions.Every any simple modification, change and equivalence of above embodiment being done according to the invention technical spirit changes, and all still belongs in the protection domain of technical solution of the present invention.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234174A (en) * | 2015-08-31 | 2016-01-13 | 东北大学 | Method for rolling ultra-thin magnesium or magnesium alloy band |
| CN106521381A (en) * | 2016-11-03 | 2017-03-22 | 湖南航天新材料技术研究院有限公司 | Preparation technology for large size super-high obdurability magnesium alloy thin plate |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
| CN111618119A (en) * | 2020-05-27 | 2020-09-04 | 洛阳高新四丰电子材料有限公司 | Preparation process of alloy steel sheet |
| CN111647832A (en) * | 2020-06-15 | 2020-09-11 | 宿迁市河海大学研究院 | Method for circularly rolling and annealing pure magnesium plate |
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| CN1939610A (en) * | 2005-10-01 | 2007-04-04 | 李华伦 | Continuous high-temperature cast-rolling technology of magnesium and aluminium alloy plates or strips |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234174A (en) * | 2015-08-31 | 2016-01-13 | 东北大学 | Method for rolling ultra-thin magnesium or magnesium alloy band |
| CN105234174B (en) * | 2015-08-31 | 2017-04-05 | 东北大学 | A kind of milling method of magnesium and magnesium alloy strip in razor-thin |
| CN106521381A (en) * | 2016-11-03 | 2017-03-22 | 湖南航天新材料技术研究院有限公司 | Preparation technology for large size super-high obdurability magnesium alloy thin plate |
| CN106521381B (en) * | 2016-11-03 | 2018-06-12 | 长沙新材料产业研究院有限公司 | A kind of large scale ultra-high strength and toughness magnesium alloy sheet preparation process |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
| CN111618119A (en) * | 2020-05-27 | 2020-09-04 | 洛阳高新四丰电子材料有限公司 | Preparation process of alloy steel sheet |
| CN111647832A (en) * | 2020-06-15 | 2020-09-11 | 宿迁市河海大学研究院 | Method for circularly rolling and annealing pure magnesium plate |
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