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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Abstract
The invention provides a method for preparing AZ31B magnesium alloy sheets, which comprises the following steps: 1, carrying out homogenization treatment on AZ31B magnesium alloy ingots; 2, rolling the homogenized AZ31B magnesium alloy ingots in a preheating rolling mill, so as to obtain primarily rolled sheet blanks; 3, carrying out surface polishing treatment on the primarily rolled sheet blanks; 4, heating the primarily rolled sheet blanks subjected to surface polishing treatment and then rolling in the preheated rolling mill, so as to obtain secondarily rolled sheet blanks; and 5, carrying out cold rolling on the secondarily rolled sheet blanks so as to obtain AZ31B magnesium alloy sheets with thickness of 0.3-0.84mm. The method disclosed by the invention is simple in production process, low in production cost, high in production efficiency, and easily controlled in technological process; AZ31B magnesium alloy sheets prepared by using the method disclosed by the invention are good in surface quality and uniform in organization; and under a room temperature condition, the tensile strength of AZ31B magnesium alloy sheets is greater than or equal to 380Mpa, the yield strength is greater than or equal to 320Mpa, and the elongation is greater than or equal to 8%, therefore, the AZ31B magnesium alloy sheets have 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.
Claims (3)
1. the preparation method of an 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%.
2. the preparation method of a kind of AZ31B magnesium alloy sheet according to claim 1 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.
3. the preparation method of a kind of AZ31B magnesium alloy sheet according to claim 1 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.
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| 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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| CN1764512A (en) * | 2003-02-28 | 2006-04-26 | 联邦科学和工业研究组织 | Magnesium alloy sheet and its production |
| 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 |
| CN101658859A (en) * | 2009-09-29 | 2010-03-03 | 哈尔滨工业大学 | Rolling manufacture method for magnesium or magnesium alloy foil |
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| 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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