CN103316915B - Method for preparing wide magnesium alloy sheet - Google Patents

Method for preparing wide magnesium alloy sheet Download PDF

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CN103316915B
CN103316915B CN201310250208.4A CN201310250208A CN103316915B CN 103316915 B CN103316915 B CN 103316915B CN 201310250208 A CN201310250208 A CN 201310250208A CN 103316915 B CN103316915 B CN 103316915B
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rolling
sheet
passage
temperature
magnesium alloy
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CN201310250208.4A
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CN103316915A (en
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张志强
宝磊
乐启炽
丁云鹏
刘轩
崔建忠
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东北大学
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Abstract

The invention relates to a method for preparing a wide magnesium alloy sheet. According to the method, a fine-grain and homogeneous magnesium alloy slab with low internal stress is homogenized and then reversibly hot-rolled at a high speed, the sheet is hugely pressed down and deformed by combining multiple pony-roughing pass high-temperature pre-annealing with vertical roller rolling and pre-stretching in the reversible high-speed hot-rolling process, and a magnesium alloy medium-thickness sheet can be obtained after multi-pass hot-rolling. After ends of the medium-thickness sheet are cropped and the edge of the medium-thickness sheet is sheared, the surface of the medium-thickness sheet is grinded and polished, the medium-thickness sheet is precisely rolled after heating and annealing, and the sheet is hugely pressed down and deformed by combining multiple pony-roughing pass high-temperature pre-annealing with repeated bending deformation and high-speed asymmetrical rolling in the precision rolling process, so that the high-precision magnesium alloy sheet is obtained. The method is simple in process, easy to operate and suitable for large-scale industrial production, sheet cracking rate is greatly reduced, and the yield of the magnesium alloy sheet is remarkably improved.

Description

A kind of wide magnesium alloy preparation of plates method

Technical field

The invention belongs to metal material processing technical field, be specifically related to a kind of wide magnesium alloy sheet material high efficiency preparation method.

Background technology

Magnesium alloy uses the lightest metal structure metal material at present, and density is approximately 1.8g/cm 3, be 1/4th of steel, 2/3rds of aluminium; Compare with aluminium alloy with steel, magnesium alloy not only has higher specific strength and specific stiffness, and there is excellent heat dispersion, capability of electromagnetic shielding, damping noise reduction performance and machining property, its product is easy to be recycled, is expected to become 21st century important lightweight structural material.Magnesium alloy also becomes the important materials of the industrial circles such as printing, automobile, defence and military, Aero-Space, 3C Product.

Sheet material is the major product of magnesium alloy, sheet material in a large number for 3C Products such as mobile phone, camera, video camera and notebook computers, and on the delivery vehicle such as aircraft, automobile, track traffic.At present, the developing direction of magnesium alloy plate be significantly reduce at double with raising performance, to promote a large amount of commercial Application of magnesium alloy plate.

Crystal structure due to magnesium alloy is close-packed hexagonal structure, and distortion is mainly by basal slip and the twin realization of the conical surface.Magnesium alloy plate prepared by pair rolling technique has strong basal plane texture, plastic deformation ability, it is little that such conventional method produces easy generation reduction in pass in magnesium alloy plate roll form process, rolling pass is many, easily occur that limit is split and face crack, and then lumber recovery reduces greatly, therefore prepare magnesium alloy wide-width board cost high, also just significantly limit the application of magnesium alloy plate.Develop a kind of wide magnesium alloy sheet material high efficiency preparation method and have important meaning to the situation changing China's magnesium industry.

Summary of the invention

For prior art Problems existing, the invention provides a kind of wide magnesium alloy sheet material high efficiency preparation method, object greatly improves the lumber recovery of wide magnesium alloy sheet material, reduces costs, and then expand the application of magnesium alloy plate.

A kind of wide magnesium alloy sheet material high efficiency preparation method provided by the invention, it mainly comprises following step:

(1) rolling slab preparation process: first preheated magnesium is melted, fusion temperature is 680 ~ 700 DEG C; Magnesium alloy after fusing, under special melting agent protection, is warming up to 720 ~ 780 DEG C, adds alloying element preheated after calculating by alloy composition in batches; Stir while adding in adition process, after added alloying element all melts, alloy melt temperature is controlled carry out refining, degasification at 740 ~ 760 DEG C and remove Slag treatment; Subsequently melt temperature is controlled to carry out being incubated, leaving standstill at 700 ~ 720 DEG C, cast after leaving standstill 30 ~ 90min; By the ingot blank of casting, the resistance-type heating furnace put into circulated air carries out two-step homogenization process subsequently, and Homogenization Treatments system is: after 350 ~ 400 DEG C of insulation 5 ~ 8h, be warming up to 400 ~ 530 DEG C of insulation 10 ~ 15h; Ingot blank after Homogenization Treatments is carried out machining surface processing.

(2) cut deal process: ingot blank good for the machined of Homogenization Treatments rear surface is carried out rolling front heating, heating-up temperature is 400 ~ 550 DEG C, temperature retention time 2 ~ 15h; First ready ingot blank is carried out the rolling that pass deformation is 10 ~ 25% on reversible hot milling roll, rolling pass 1 ~ 3, unannealed between passage, between passage, sheet material edge carries out edge rolling distortion; Carry out reversible hot rolling more subsequently, pass deformation is 20 ~ 30%, rolling pass is 3 ~ 8, unannealed between passage, carries out edge rolling distortion, rolls to a kind of mode in pre-tension deformation or asymmetrical rolling distortion or two kinds and two or more combinations between passage to sheet material edge; Then carry out High Temperature Pre annealing to sheet material, the magnesium alloy plate after being annealed by High Temperature Pre carries out high speed and depresses rolling greatly, and pass deformation is 50 ~ 70%, rolling 2 ~ 4 passage, unannealed between passage, carries out rolling to prestretched between passage; Finally carry out 2 ~ 3 passage hot rolling finish to gauges, carry out between passage rolling to pre-tension deformation, finishing temperature control is at 300 ~ 400 DEG C; Hot rolling total deformation controls 80 ~ 95%.

(3) thin plate rolling process: the hot rolled plate after above-mentioned hot rolling is carried out crop end and cutting edge process, effects on surface carries out sanding and polishing process afterwards; The hot rolled plate handled well finish rolling after heating anneal, final rolling temperature is 350 ~ 450 DEG C, and roller temperature is 120 ~ 250 DEG C, and in finishing stands, sheet material leaves in before and after finishing mill with in the crimping device of Coil Box; First the rolling that pass deformation is 10 ~ 25% is carried out to the hot rolled plate handled well, rolling 1 ~ 2 passage; Carrying out 3 ~ 5 pass deformations is subsequently 30 ~ 50% rollings, and hocket between passage alternating bending distortion and asymmetrical rolling distortion; Finally carry out 2 ~ 3 passage finish rolling finish to gauges, finish rolling finishing temperature control is at 250 ~ 350 DEG C; Finish rolling total deformation controls 80 ~ 95%.

Described alloying element comprise in Al, Zn, Mn, Y, Gd, Si, Zr, Cd, Bi, Nd, La, Ce, Cu, Dy, Sn, Er etc. two or more; Alloying element can add with the form of the form of simple metal or intermediate alloy.

Described casting adopts the cunning semi-continuous casting method of low frequency electromagnetic, casting technique system is: electromagnetic field frequency is 20 ~ 30Hz, and magnetic field intensity is 15 ~ 30mT, and casting speed is 20 ~ 80mm/min, cooling water inflow is 50 ~ 400L/min, and crystallizer is wrought aluminium cover crystallizer; The specification of strand is: thick 80 ~ 400mm, wide 300 ~ 1500mm, long 1000 ~ 5000mm.

In described Plate Rolling Process, edge rolling deflection is 5 ~ 18%, roll to pre-tension deformation amount be 3 ~ 10%; High Temperature Pre annealing temperature is 450 ~ 550 DEG C, and annealing time is 30min ~ 90min; Mill speed is 60 ~ 200m/min; Roll need not heat.

In described thin plate rolling process, alternating bending detrusion is carried out on straightener, and straightener is 13 ~ 21 rollers, and the control of alternating bending deflection is 0.02 ~ 2.0%.

In described cut deal or thin plate rolling process, all the other passages except mark adopts asymmetrical rolling, can adopt pair rolling or asymmetrical rolling; Adopt same roller footpath working roll during asymmetrical rolling, adjustment roller rotating speed realizes asymmetrical rolling, and upper working rolls and lower working rolls velocity ratio is 1: 1.01 ~ 1: 1.50.

Compared with prior art, the invention has the beneficial effects as follows:

1, the present invention is compared with traditional handicraft, adopt high speed super large Reduction Technology, Edger rolling technology in heavy plate rolling process in the magnesium alloy, roll combination to one or both in prestretched technology, Differential speed rolling technology and high annealing technology and two or more technology, can sheet material be given full play to moulding.

2, thin plate rolling process of the present invention adopts Strong shear effect in alternating bending distortion and asymmetrical rolling deformation process greatly can weaken rolling texture, and the moulding of sheet material is improved greatly, and sheet material limit is split and significantly reduced with face crack.

3, present invention process is simple, and device therefor is conventional common apparatus, is easy to transplant and operation, and cost is low, can greatly improve magnesium alloy plate lumber recovery, significantly reduce board cost, be suitable for large-scale industrial production, and then can expand the application of magnesium alloy plate.

Detailed description of the invention

The present invention is further illustrated below by embodiment.It should be understood that embodiments of the invention are for illustration of the present invention instead of limitation of the present invention.Essence according to the present invention all belongs to the scope of protection of present invention to the simple modifications that the present invention carries out.

Embodiment 1:

According to the weight of Mg, Al, Zn and the Mn needed for GB/T5153-2003 criterion calculation melting 1000Kg AZ31B magnesium alloy; Load weighted material is put into 150 DEG C of drying bakers and carry out preheating, then preheated Mg is put into the crucible being heated to 700 DEG C and carry out melting, 720 DEG C are warming up to after magnesium all melts, add Al and Zn, stir while adding, after added metallic element all melts, temperature is risen to 740 DEG C and add Mn (with MnCl 2form add), also stir while adding; When melt temperature is 740 DEG C, carry out refining, degasification and remove Slag treatment; Subsequently melt temperature is controlled to carry out being incubated, leaving standstill at 710 DEG C, after leaving standstill 60min, carry out the cunning electromagnetic casting of low frequency, electromagnetic casting frequency 20Hz, magnetic field intensity is 22mT, casting speed is 37mm/min, and cooling water inflow is 350L/min, and crystallizer cross section used is 350mm × 850mm; Subsequently ingot blank is carried out two-step homogenization process, Homogenization Treatments system is be warming up to 410 DEG C of insulation 15h after 350 DEG C of insulation 8h, and the ingot blank after process carries out machining surface processing, and after processing, ingot blank specification is thick 300mm × wide 800mm × long 1500mm.Heated by the ingot blank processed, heating-up temperature is 450 DEG C, insulation 5h; Subsequently ready ingot blank length direction is carried out continuous 2 passage hot rollings on reversible Hot Rolling Process For High Temperature Alloy Plate machine, rolling mill practice is: passage is deformed into 300mm → 270mm → 230mm, mill speed is 50m/min, before the 1st passage is rolled, carry out the edge rolling that deflection is 7%; Next the reversible hot rolling of the 3rd, 4,5 passage is carried out, rolling mill practice is: passage is deformed into 230mm → 184mm → 147mm → 102mm, mill speed is 80m/min, the edge rolling that deflection is 6% is carried out before the 3rd passage, before the 4th passage, carry out deflection is the edge rolling of 5% and the pre-tension deformation rolled to 3%, is the asynchronous hot rolling of 1: 1.2 at the 5th passage employing friction speed ratio; Then sheet material is put into the high annealing that 450 DEG C of stoves carry out 30min and carry out the reversible hot rolling of the 6th, 7 passage high-speed great-deformation again, rolling mill practice is: passage is deformed into 102mm → 41mm → 14mm, and mill speed is 150m/min.In the rolling process, all the other passages except mark adopts asymmetrical rolling all adopt pair rolling.The AZ31B magnesium alloy plate width prepared through embodiment 1 process is 800mm, and thickness is 14mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 263MPa, and yield strength is 178MPa, and percentage elongation is 17%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 268MPa, and yield strength is 181MPa, and percentage elongation is 19%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 15mm that the degree of depth is split on sheet material limit, reduction by 50% compared with traditional preparation methods.

Embodiment 2:

Utilize in embodiment 1 the AZ31B magnesium alloy plate of the wide 760mm of thick 14mm shut out to carry out thin plate rolling, carry out crop end and cutting edge process to hot rolled plate before thin plate rolling after, effects on surface carries out sanding and polishing process; The hot rolled plate handled well finish rolling after heating anneal, final rolling temperature is 400 DEG C, and roller temperature is 150 DEG C, and mill speed is 200m/min.First the 1st carried out to the hot rolled plate handled well, 2 passes, rolling mill practice is: pass deformation is 14mm → 7mm → 3.5mm, and after the 1st road finish rolling, sheet material just leaves in in the crimping device of Coil Box before and after finishing mill, and hot rolling the temperature inside the box is 380 DEG C; Carry out the 3rd subsequently, 4 passes, rolling mill practice is 3.5mm → 2.5mm → 2mm, and adopt 21 roller level(l)ing machines to carry out alternating bending distortion the 3rd, before 4 passes, deflection is 0.5%, the 3rd, 4 passes time adopt asymmetrical rolling, asynchronous ratio is 1: 1.10.The AZ31B magnesium alloy plate width prepared through embodiment 2 process is 760mm, and thickness is 2mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 297MPa, and yield strength is 233MPa, and percentage elongation is 13%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 301MPa, and yield strength is 235MPa, and percentage elongation is 15%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 11mm that the degree of depth is split on sheet material limit, reduction by 37% compared with traditional preparation methods.

Embodiment 3:

The AZ31B ingot blank of the thick 300mm in embodiment 1 after homogenising × wide 800mm × long 1500mm is utilized to be rolled in the width direction.First heated by ready ingot blank, heating-up temperature is 450 DEG C, insulation 5h; Subsequently ready ingot blank width is carried out 1 passage hot rolling on reversible Hot Rolling Process For High Temperature Alloy Plate machine, rolling mill practice is: passage is deformed into 300mm → 255mm, and mill speed is 40m/min; Next the reversible hot rolling of the 2nd, 3,4,5 passage is carried out, rolling mill practice is: passage is deformed into 255mm → 204mm → 166mm → 132mm → 100mm, mill speed is 60m/min, the edge rolling that deflection is 6% is carried out before the 2nd passage, the edge rolling that deflection is 5% is carried out before the 4th passage, employing friction speed ratio is the asynchronous hot rolling of 1: 1.30 subsequently, adopts the pre-tension deformation rolled to 5% in the 5th passage; Then sheet material is put into the high annealing that 450 DEG C of stoves carry out 40min and carry out the reversible hot rolling of the 6th, 7 passage high-speed great-deformation again, rolling mill practice is: passage is deformed into 100mm → 50mm → 20mm, and mill speed is 120m/min.In the rolling process, all the other passages except mark adopts asymmetrical rolling all adopt pair rolling.The AZ31B magnesium alloy plate width prepared through embodiment 3 process is 1500mm, and thickness is 20mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 246MPa, and yield strength is 157MPa, and percentage elongation is 19%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 251MPa, and yield strength is 163MPa, and percentage elongation is 21%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 12mm that the degree of depth is split on sheet material limit, reduction by 53% compared with traditional preparation methods.

Embodiment 4:

Utilize in embodiment 3 the wide 1400mmAZ31B magnesium alloy plate of the thick 20mm shut out to carry out thin plate rolling, carry out crop end and cutting edge process to hot rolled plate before thin plate rolling after, effects on surface carries out sanding and polishing process; The hot rolled plate handled well finish rolling after heating anneal, final rolling temperature is 420 DEG C, and roller temperature is 200 DEG C, and mill speed is 180m/min.First the 1st carried out to the hot rolled plate handled well, 2 passes, rolling mill practice is: pass deformation is 20mm → 12mm → 7.2mm, and after the 1st road finish rolling, sheet material just leaves in in the crimping device of Coil Box before and after finishing mill, and hot rolling the temperature inside the box is 400 DEG C; Carry out the 3rd subsequently, 4,5 passes, rolling mill practice is 7.2mm → 3.6mm → 2.5mm → 2mm, the 3rd, 4, adopt 21 roller level(l)ing machines to carry out alternating bending distortion before 5 passes, deflection is 0.3%, the 3rd, 4,5 passes time adopt asymmetrical rolling, asynchronous ratio is 1: 1.30.In the rolling process, all the other passages except mark adopts asymmetrical rolling all adopt pair rolling.The AZ31B magnesium alloy plate width prepared through embodiment 4 process is 1400mm, and thickness is 2mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 290MPa, and yield strength is 229MPa, and percentage elongation is 14%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 275MPa, and yield strength is 233MPa, and percentage elongation is 16%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 10mm that the degree of depth is split on sheet material limit, reduction by 45% compared with traditional preparation methods.

Embodiment 5:

According to the weight of Mg, Zn and the Zr needed for GB/T5153-2003 criterion calculation melting 500Kg ZK60 magnesium alloy, Zr adds with Mg-30%Zr intermediate alloy form; Load weighted material is put into 150 DEG C of drying bakers and carry out preheating, then preheated Mg is put into the crucible being heated to 700 DEG C and carry out melting, 780 DEG C are warming up to after magnesium all melts, add Mg-Zr intermediate alloy, stir while adding, after being with the metallic element added all to melt, temperature is controlled add Zn at 740 DEG C; After Zn all dissolves, carry out refining, degasification and remove Slag treatment; Subsequently melt temperature is controlled to carry out being incubated, leaving standstill at 720 DEG C, after leaving standstill 90min, carry out the cunning electromagnetic casting of low frequency, electromagnetic casting frequency 20Hz, magnetic field intensity is 28mT, casting speed is 30mm/min, and cooling water inflow is 250L/min, and crystallizer cross section used is 300mm × 650mm; Subsequently ingot blank is carried out two-step homogenization process, Homogenization Treatments system is be warming up to 450 DEG C of insulation 12h after 350 DEG C of insulation 5h, and the ingot blank after process carries out machining surface processing, and after processing, ingot blank specification is thick 240mm × wide 600mm × long 1200mm.Heated by the ingot blank processed, heating-up temperature is 450 DEG C, insulation 5h; Subsequently ready ingot blank length direction is carried out continuous 1 passage hot rolling on reversible Hot Rolling Process For High Temperature Alloy Plate machine, rolling mill practice is: passage is deformed into 240mm → 216mm, and mill speed is 60m/min, before the 1st passage is rolled, carry out the edge rolling that deflection is 8%; Next the reversible hot rolling of the 2nd, 3,4 passage is carried out, rolling mill practice is: passage is deformed into 216mm → 172mm → 120mm → 80mm, mill speed is 90m/min, before the 2nd passage, carry out deflection is the edge rolling of 5% and the pre-tension deformation rolled to 3%, before the 3rd passage, carry out the edge rolling that deflection is 3%, be the asynchronous hot rolling of 1: 1.40 at the 4th passage employing friction speed ratio; Then sheet material is put into the high annealing that 450 DEG C of stoves carry out 50min and carry out the reversible hot rolling of the 5th, 6 passage high-speed great-deformation again, rolling mill practice is: passage is deformed into 80mm → 32mm → 10mm, and mill speed is 140m/min.In the rolling process, all the other passages except mark adopts asymmetrical rolling all adopt pair rolling.The ZK60 magnesium alloy plate width prepared through embodiment 5 process is 600mm, and thickness is 10mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 301MPa, and yield strength is 237MPa, and percentage elongation is 15%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 307MPa, and yield strength is 240MPa, and percentage elongation is 17%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 17mm that the degree of depth is split on sheet material limit, reduction by 45% compared with traditional preparation methods.

Embodiment 6:

Utilize in embodiment 5 the ZK60 magnesium alloy plate of the wide 550mm of thick 10mm shut out to carry out thin plate rolling, carry out crop end and cutting edge process to hot rolled plate before thin plate rolling after, effects on surface carries out sanding and polishing process; The hot rolled plate handled well finish rolling after heating anneal, final rolling temperature is 450 DEG C, and roller temperature is 280 DEG C, and mill speed is 150m/min.First the 1st carried out to the hot rolled plate handled well, 2 passes, rolling mill practice is: pass deformation is 10mm → 7mm → 4mm, and after the 1st road finish rolling, sheet material just leaves in in the crimping device of Coil Box before and after finishing mill, and hot rolling the temperature inside the box is 400 DEG C; Carry out the 3rd subsequently, 4,5 passes, rolling mill practice is 4mm → 2mm → 1mm → 0.6mm, the 3rd, 4, adopt 21 roller level(l)ing machines to carry out alternating bending distortion before 5 passes, deflection is 0.3%, the 3rd, 5 passes time adopt asymmetrical rolling, asynchronous ratio is 1: 1.03.In the rolling process, all the other passages except mark adopts asymmetrical rolling all adopt pair rolling.The ZK60 magnesium alloy plate width prepared through embodiment 6 process is 550mm, and thickness is 0.6mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 323MPa, and yield strength is 275MPa, and percentage elongation is 10%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 330MPa, and yield strength is 282MPa, and percentage elongation is 12%, and sheet material vertical and horizontal performance difference is less, and anisotropy reduces greatly; It is 10mm that the degree of depth is split on sheet material limit, reduction by 30% compared with traditional preparation methods.

comparing embodiment:

According to the weight of Mg, Al, Zn and the Mn needed for GB/T5153-2003 criterion calculation melting 1000KgAZ31B magnesium alloy; Load weighted material is put into 150 DEG C of drying bakers and carry out preheating, then preheated Mg is put into the crucible being heated to 700 DEG C and carry out melting, 720 DEG C are warming up to after magnesium all melts, add Al and Zn, stir while adding, after being with the metallic element added all to melt, temperature being risen to 740 DEG C and add Mn (adding with the form of MnCl2), also stir while adding; When melt temperature is 740 DEG C, carry out refining, degasification and remove Slag treatment; Controlled by melt temperature subsequently to carry out being incubated, leaving standstill at 710 DEG C, carry out traditional semi-continuous casting after leaving standstill 60min, casting speed is 40mm/min, and cooling water inflow is 350L/min, and crystallizer cross section used is 350mm × 850mm; Subsequently ingot blank is carried out Homogenization Treatments, Homogenization Treatments system is 410 DEG C of insulation 15h, and the ingot blank after process carries out machining surface processing, and after processing, ingot blank specification is thick 300mm × wide 800mm × long 1500mm.Heated by the ingot blank processed, heating-up temperature is 450 DEG C, insulation 5h; Subsequently ready ingot blank length direction is carried out continuous 2 passage hot rollings on reversible Hot Rolling Process For High Temperature Alloy Plate machine, rolling mill practice is: passage is deformed into 300mm → 270mm → 230mm, and mill speed is 50m/min; Next carry out the reversible hot rolling of the 3rd, 4,5 passage, rolling mill practice is: passage is deformed into 230mm → 184mm → 147mm → 102mm, and mill speed is 80m/min; And then carrying out the reversible hot rolling of the 6th, 7 passage, rolling mill practice is: passage is deformed into 102mm → 41mm → 14mm, and mill speed is 150m/min.

AZ31B magnesium alloy plate width prepared by this process is 800mm, and thickness is 14mm; Sheet material longitudinally (being parallel to rolling direction) performance is: tensile strength is 225MPa, and yield strength is 131MPa, and percentage elongation is 13%; Sheet material laterally (perpendicular to rolling direction) performance is: tensile strength is 247MPa, and yield strength is 145MPa, and percentage elongation is 16%, and sheet material vertical and horizontal performance difference is comparatively large, and anisotropy is larger; It is 33mm that the degree of depth is split on sheet material limit.

As can be seen from above-mentioned, the sheet material prepared by the method for the application all has better advantage in tensile strength, yield strength, percentage elongation and lumber recovery etc.

Claims (6)

1. a wide magnesium alloy preparation of plates method, is characterized in that: described preparation method comprises the steps:
(1) rolling slab preparation process: first preheated magnesium is melted, fusion temperature is 680 ~ 700 DEG C; Be warming up to 720 ~ 780 DEG C after fusing, add alloying element preheated after calculating by alloy composition in batches; After added alloying element all melts, alloy melt temperature is controlled carry out refining, degasification at 740 ~ 760 DEG C and remove Slag treatment; Subsequently melt temperature is controlled to carry out being incubated, leaving standstill at 700 ~ 720 DEG C, cast after leaving standstill 30 ~ 90min; Subsequently the ingot blank of casting is carried out two-step homogenization process, Homogenization Treatments system is: after 350 ~ 400 DEG C of insulation 5 ~ 8h, be warming up to 400 ~ 530 DEG C of insulation 10 ~ 15h; Ingot blank after Homogenization Treatments is carried out machining surface processing;
(2) cut deal process: the ingot blank of step (1) is carried out rolling front heating, heating-up temperature is 400 ~ 550 DEG C, temperature retention time 2 ~ 15h; First ready ingot blank is carried out the rolling that pass deformation is 10 ~ 25% on reversible hot milling roll, rolling pass 1 ~ 3, unannealed between passage, between passage, sheet material edge carries out edge rolling distortion; Carry out reversible hot rolling more subsequently, pass deformation is 20 ~ 30%, rolling pass is 3 ~ 8, unannealed between passage, carries out edge rolling distortion, rolls to a kind of mode in pre-tension deformation or asymmetrical rolling distortion or two kinds and two or more combinations between passage to sheet material edge; Then carry out High Temperature Pre annealing to sheet material, the magnesium alloy plate after being annealed by High Temperature Pre carries out high speed and depresses rolling greatly, and pass deformation is 50 ~ 70%, rolling 2 ~ 4 passage, unannealed between passage, carries out rolling to prestretched between passage; Finally carry out 2 ~ 3 passage hot rolling finish to gauges, carry out between passage rolling to pre-tension deformation, finishing temperature control is at 300 ~ 400 DEG C; Hot rolling total deformation controls 80 ~ 95%;
(3) thin plate rolling process: step (2) gained hot rolled plate is carried out crop end and cutting edge process, and effects on surface carries out sanding and polishing process afterwards; The hot rolled plate handled well finish rolling after heating anneal, final rolling temperature is 350 ~ 450 DEG C, and roller temperature is 120 ~ 250 DEG C, and in finishing stands, sheet material leaves in before and after finishing mill with in the crimping device of Coil Box; First the rolling that pass deformation is 10 ~ 25% is carried out to the hot rolled plate handled well, rolling 1 ~ 2 passage; Carrying out 3 ~ 5 pass deformations is subsequently 30 ~ 50% rollings, and hocket between passage alternating bending distortion and asymmetrical rolling distortion; Finally carry out 2 ~ 3 passage finish rolling finish to gauges, finish rolling finishing temperature control is at 250 ~ 350 DEG C; Finish rolling total deformation controls 80 ~ 95%.
2. preparation method according to claim 1, is characterized in that: described alloying element comprise in Al, Zn, Mn, Y, Gd, Si, Zr, Cd, Bi, Nd, La, Ce, Cu, Dy, Sn, Er two or more; Alloying element adds with the form of the form of simple metal or intermediate alloy.
3. preparation method according to claim 1, it is characterized in that: described casting adopts the cunning semi-continuous casting method of low frequency electromagnetic, casting technique system is: electromagnetic field frequency is 20 ~ 30Hz, magnetic field intensity is 15 ~ 30mT, casting speed is 20 ~ 80mm/min, cooling water inflow is 50 ~ 400L/min, and crystallizer is wrought aluminium cover crystallizer; The specification of strand is: thick 80 ~ 400mm, wide 300 ~ 1500mm, long 1000 ~ 5000mm.
4. preparation method according to claim 1, is characterized in that: in described Plate Rolling Process, and edge rolling deflection is 5 ~ 18%, roll to pre-tension deformation amount be 3 ~ 10%; High Temperature Pre annealing temperature is 450 ~ 550 DEG C, and annealing time is 30min ~ 90min; Mill speed is 60 ~ 200m/min; Roll need not heat.
5. preparation method according to claim 1, is characterized in that: in described thin plate rolling process, alternating bending detrusion is carried out on straightener, and straightener is 13 ~ 21 rollers, and the control of alternating bending deflection is 0.02 ~ 2.0%.
6. preparation method according to claim 1, is characterized in that: in described cut deal or thin plate rolling process, and all the other passages except mark adopts asymmetrical rolling, can adopt pair rolling or asymmetrical rolling; Adopt same roller footpath working roll during asymmetrical rolling, adjustment roller rotating speed realizes asymmetrical rolling, and upper working rolls and lower working rolls velocity ratio is 1: 1.01 ~ 1: 1.50.
CN201310250208.4A 2013-06-24 2013-06-24 Method for preparing wide magnesium alloy sheet CN103316915B (en)

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CN105349861B (en) * 2015-11-24 2017-07-07 北京工业大学 It is a kind of can quick roll forming magnesium sheet metal and its milling method
CN106807758A (en) * 2015-11-30 2017-06-09 北京有色金属研究总院 A kind of aluminum alloy ultra-thick plate board-shape control method
CN106862272B (en) 2015-12-14 2020-01-31 宝山钢铁股份有限公司 Preparation method of high-strength high-ductility magnesium alloy plates
CN105817518B (en) * 2016-05-12 2018-08-31 北京机电研究所有限公司 A kind of method and apparatus promoting magnesium alloy room temperature forming property
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
CN110241337A (en) * 2019-06-25 2019-09-17 天津忠旺铝业有限公司 A kind of preparation method of super large wide cut aluminum alloy plate materials
CN110216145A (en) * 2019-07-10 2019-09-10 太原科技大学 Milling method is split on a kind of magnesium alloy plate grain refining control side

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