CN101157125A - A method and apparatus for processing metallic material within complex magnetic field - Google Patents
A method and apparatus for processing metallic material within complex magnetic field Download PDFInfo
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Abstract
The invention relates to a method for the high temperature processing of metal material under a composite magnetic field. In the solidification process of the metal material, a pulsed magnetic field and a superconducting magnetic field which are coaxial in the same direction are applied to a metal bath, to control the grain size and the crystal orientation. A device applied by the method of the invention comprises a heating furnace body (2), a pulsed magnet (3), a superconducting magnet (4), a water cooling jacket (5), a heating control system (11), a pulsed magnet power (12), a superconducting magnet power (13), and a circulating cold water equipment (14). The central axle lines of the heating furnace body (2), the pulsed magnet (3), and the superconducting magnet (4) are coincident; the heating furnace body (2), the pulsed magnet (3), and the superconducting magnet (4) are nested layer by layers from inside to outside. The invention can perform the comprehensive optimal control to the organizational structure of the material, while the superconducting magnetic field optimizes the crystal orientation, the composite magnetic field also plays the function of strengthening the grain refinement; the two magnetic field technical methods of the prior pulsed magnetic field processing and the strong magnetic field processing are integrated into a whole, thereby simplifying the process flow, and reducing the energy consumption.
Description
Technical field
The present invention relates under a kind of magnetic field condition metal material be carried out the method and the device of high-temperature process, be specifically related to a kind of high-temperature processing method and device that utilizes the resultant field improvement of terms metal solidification texture of pulsed magnetic field and superconducting intense magnetic field formation.
Background technology
The solidified structure of metal plays decisive role to the quality and the performance of its product, is the important content of metal solidification process research to the control of metal solidification texture.Evenly tiny equi-axed crystal can improve the mechanical property of material, and the anisotropy of microstructure also is the critical nature of functional material simultaneously.Therefore, rationally control the grain structure of material and to solidify crystal orientation be two subject matters that face in the metal freezing technology.
Adopt traditional solidification technology, be thick column crystal or arborescent structure as what continuous casting, continuous casting and rolling and conventional cast method obtained.The refinement technology of material grains tissue mainly adopts following three kinds of means at present: the one, by in molten metal, adding alterant, increase nucleation rate, and thinning microstructure, this method all pollutes material itself and environment; The 2nd, control cooling velocity and pouring temperature improve cooling velocity the molten metal degree of supercooling are improved, and increase nucleation rate, but be difficult to improve the inside cooling velocity of heavy castings, and can produce the defective of internal stress, the control of pouring temperature is subjected to the restriction of working condition, acts on very limited; The 3rd, by forcing stirring, impel dendrite fragmentation, crystal grain quantity is increased, size reduces, but deficiency is: refining effect is not obvious, stirs easily to be involved in air and impurity the low effect that influences temperature field and homogenization of composition of stirring intensity, particularly continuous casting facts have proved, strong stirring can make strand cause banded segregation.
Applying pulsed magnetic field in metallic solution can have significant thinning effect to the metal grain tissue, and to material and environmental nonpollution, is a new technology controlling metal solidification texture at present.The melt vibration that pulsed magnetic pressure causes causes the obvious refinement of crystal grain, nodularization; Violent forced convection promotes crystal grain free from the type wall, increases the nucleation rate of metal bath greatly.
For the crystal orientation control technology in the material solidification process, mainly according to each magnetic susceptibility difference of crystal, utilize magnetic field Lorentz power effect at present, obtain to be parallel to the axially texture of magnetic direction.Magnetic field can be applied in the directional solidification process.Magnetic field only can apply effect to the orientation of the forming core crystal grain in the Quench thin layer of initial solidification, owing to lack the melt space that crystal grain freely is orientated, causes the magnetic field effect not obvious.Magnetic field puts in the common process of setting more at present, and the advantage of comparing directional solidification is that the melt space that forming core crystal grain freely is orientated is bigger, and the magnetic field long action time is easier to produce axially texture.Along with the appearance of the above superconducting intense magnetic field of 5T, the effect of the Lorentz power in the high-intensity magnetic field is more obvious, and to namagnetic substance the possibility that becomes of the utilization of uncared-for magnetizing force always.Therefore, the crystalline orientation control down of relevant magnetic field, and solidify with the theory and application research of crystallization again and begin to be subjected to general attention.
Existing publication about material heating Electromagnetic Treatment aspect is more, mainly is divided into: high-intensity magnetic field processing method or device, high frequency magnetic field processing method or device, gradient magnetic processing method or device, pulsed magnetic field processing method or device and magnetic field electric field compounding method or device etc.
Chinese patent CN2879162Y discloses a kind of high temperature treating device under strong magnetic field, utilize its device single high-intensity magnetic field (more than the 5T) and hot environment can be coupled, the material fusion process is handled, and can be utilized its device that melt is moved axially in magnetic field, carry out directional solidification.
Chinese patent CN1472021 discloses a kind of high frequency magnetic field method process for refining of spontaneous enhancing body.Its device utilizes high frequency magnetic field heat refining effect and the in-situ graded composite of the aggregate effect of the high frequency magnetic field of inducting acquisition surface modification.
Chinese patent CN1865465 discloses a kind of method and apparatus that utilizes high-strength gradient magnetic to prepare gradient composites.Utilize the effect of high-strength gradient magnetic in molten metal material, control the solidifying of melt makes gradient composites, and controls second and distribute in liquid matrix.
Chinese patent CN1731537 discloses the preparation method of in-situ authigenic MgB2 superconductor under a kind of pulsed magnetic field action.On the basis of tiretube process, material is applied pulsed magnetic field, make the low temperature superconducting material that tissue is excellent, critical current density is high.Chinese patent CN2898052 discloses the device of electromigration purification metal under a kind of magnetostatic field.Its device synergy by magnetic field and electric field makes solid phase particles or the foreign atom generation directional migration in the motlten metal, purifies metallic matrix.
In the above patent, mainly finish by applying pulsed magnetic field apparatus for the control of crystallite dimension in the material solidification process, the control of crystal orientation is mainly finished by applying the high-intensity magnetic field device.In the prior art, all be that the mode with the heating of single magnetic field and high temperature is coupled, finish single organizational controls purpose.For some functional material that needs are controlled crystallite dimension and crystal orientation simultaneously, material require experiences heating process twice, can destroy the grain structure that last time processing obtains toward backward time heating, causes unstable properties; The process route of twice heating simultaneously is long, the waste resource.So need a kind of new method and install and pulsed magnetic field and high-intensity magnetic field can be combined, make material under the resultant field effect, carry out high-temperature process, to address the above problem.Still do not see at present the relevant report and the patent of metal material high-temperature processing method and device under the resultant field that pulsed magnetic field and high-intensity magnetic field are combined.
Summary of the invention
The purpose of this invention is to provide metal material high-temperature processing method and device under a kind of resultant field.
The present invention applies coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to metal bath in the metal material process of setting, control crystallite dimension and crystal orientation.
Adopt method of the present invention can utilize the effect of resultant field, the institutional framework of material is carried out complex optimum control, strengthen the grain refinement effect; And can solve in the current material process of setting, control the technical problem of crystallite dimension and crystal orientation simultaneously, simplify process route, energy savings cost, the serviceability of optimization material.
In the metal material process of setting, effect such as the Marangoni convection current that the Stocks sedimentation of solute, free convection, molten surface tension force and thermal gradient cause produces negative influence to the solidified structure of material, cause that material grains is thick, solute generation segregation, grain orientation are disorderly and unsystematic etc., influence the material serviceability.The present invention introduces the resultant field that is made of superconducting intense magnetic field and pulsed magnetic field in the metal material process of setting.Superconducting intense magnetic field is the Stocks gravitational settling and the free convection factor of balance solute effectively, and can guiding material solidify along certain crystal orientation.Pulsed magnetic field can effectively suppress Marangoni convection action in the melt, crystal grain thinning.Simultaneously, the electromagnetic force that electromagnetic interaction forms in alloy graining process can produce blockage effect to melt, melt is compressed repeatedly and vibrates, and plays the crystal grain thinning and the second mutually equally distributed effect, improves solidified structure.
The isolated plant of metal material high-temperature process mainly is made up of heating furnace body, pulse magnet, superconducting magnet, water collar, lower cover, upper cover plate, thermocouple, upper limit position block, lower position block, heating control system, pulse magnet power supply, superconducting magnet power supply and circulating water equipment under the resultant field of the present invention.The boiler tube of heating furnace body inside is made of the refractory ceramics pipe, and the high-temperature heater silk is wrapped in the boiler tube outside, constitutes the tubulose body of heater, and the body of heater heating-up temperature is up to 1300 ℃.Pulse magnet is centered around the outside of heating furnace body, and pulse magnet is a solenoid structure, and used wire rod is the pure copper wire of square-section.Superconducting magnet is enclosed within the outside of pulse magnet, and superconducting magnet adopts the magnetic plug structure, and superconducting wire is the Nb-Ti alloy material, magnetic field intensity 〉=6T, magnetic field homogeneity range size Φ 100mm.Heating furnace body, pulse magnet, superconducting magnet three's central axes, successively nested from inside to outside.The water collar material is a magnetism-free stainless steel, and water collar is complicated cylindric, and the axial longitudinal section of body is " M " shape.The water collar installation site makes cooling water flow that heating furnace body, pulse magnet, superconducting magnet three are separated each other between heating furnace body, pulse magnet, superconducting magnet three.Gap greater than 5mm is arranged between heating furnace body and the water collar, wherein be filled with heat-preservation cotton.Upper cover plate and lower cover lay respectively at the upper and lower end of device, position fixing to whole device feature.Upper limit position block is between upper cover plate and heating furnace body.Lower position block is between lower cover and heating furnace body.Thermocouple penetrates in the vertical blind hole of upper limit position block near the ingot place.Outside at device is equipped with heating control system, pulse magnet power supply, superconducting magnet power supply and recirculated cooling water equipment.Wherein, heating control system is connected with heating furnace body with thermocouple respectively by lead, according to thermocouple measurement and the metal alloy compositions temperature value that is real-time transmitted to,, reach the fusing of control metal bar and the purpose of process of setting by the energising and the off-position of real-time adjustment heating furnace body; The pulse magnet power supply is connected with pulse magnet by lead, and according to outside regulating command, the control of pulse magnetic field is finished in the control of the duty by the paired pulses magnet; The superconducting magnet power supply is connected with superconducting magnet by lead, according to outside regulating command, by the control to the duty of superconducting magnet, finishes the control to superconducting intense magnetic field; Recirculated cooling water equipment is connected with the upper/lower terminal of water collar respectively by water pipe, and in the whole contrive equipment course of work, the cooling to heating furnace body, pulse magnet and superconducting magnet is finished in the effect of circulating water, guarantees safe operation.
The inventive method comprises following implementation step:
1) at first ingot is cut into the bar-shaped of given size;
2) bar-shaped ingot is positioned in the heating furnace body furnace chamber, is warming up to more than the fusing point, be incubated subsequently to ingot and melt fully;
3) control heating furnace body makes the ingot melt begin cooling, and while or difference unbalanced pulse magnet and superconducting magnet apply coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to melt;
4) treat that ingot solidifies after, close pulsed magnetic field and superconducting intense magnetic field, obtain the tiny metal material consistent of crystallite dimension with crystal orientation.
Wherein, ingot of the present invention can be Fe, Al, Cu, Pb, Sn, Zn etc. or its alloy material.The pulsed magnetic field parameter is: pulse current 0-600A, pulse frequency 0-5Hz.The superconducting intense magnetic field parameter is: magnetic field intensity 〉=6T, magnetic field homogeneity range size Φ 100mm.The major parameter of pulse magnet power supply is: pulse voltage 500-5000V, power capacitor 8-600 μ F, energy storage value 72J, concussion frequency 200-3000Hz, discharge current 0-600A, discharge frequency 0-10Hz.
In the inventive method, the resultant field of pulsed magnetic field and superconducting intense magnetic field is put in the metal bath simultaneously, be different from that single magnetic field puts in the metal bath in the prior art.Applying generally of existing single magnetic field can only produce invigoration effect on the one hand to metal bath, as the thin brilliant effect of single control, or single control grain orientation effect; And apply resultant field the time, can in a process of setting of metal bath, produce thin brilliant effect of control and the effect of control grain orientation simultaneously, be beneficial to the raising of material property.
The present invention compared with prior art, advantage is: existing pulsed magnetic field is handled and high-intensity magnetic field is handled two kinds of magnetic field technique methods and is integrated into one and overlaps technical method, made material finish crystallite dimension and crystal orientation simultaneously in a heating process.When crystal orientation was optimized in apply pulse magnetic field, the resultant field effect can be strengthened the grain refinement effect.This invention can be simplified process route, saves production cost, and raises the efficiency; Can also reduce energy resource consumption, alleviate the burden of environment; Simultaneously, material reduces by a heating process, can avoid post bake to the last time destruction and the interference of heat treated performance of material as far as possible, avoids introducing that material secondary is subjected to impurity and air in the thermal process to effect of material performance, optimizes the serviceability of material.
Description of drawings
Metal material high-temperature processing method schematic diagram under Fig. 1 resultant field of the present invention;
Among the figure: solid arrow A, B, C represent that the resultant field that adopts the inventive method to finish applies order and mode, and empty arrow D, E represent that respectively the single pulsed magnetic field and the superconducting intense magnetic field that apply in other prior art apply mode.
Fig. 2 uses the device schematic diagram of metal material high-temperature processing method under the resultant field of the present invention;
Among the figure: 1. ingot, 2. heating furnace body, 3. pulse magnet, 4. superconducting magnet, 5. water collar, 6. lower cover, 7. upper cover plate, 8. thermocouple, 9. upper limit position block, 10. lower position block, 11. heating control system, 12. pulse magnet power supplys, 13. superconducting magnet power supplys, 14. recirculated cooling water equipment.
The specific embodiment
Below in conjunction with accompanying drawing apparatus of the present invention are elaborated.
The inventive method is in the metal material process of setting, and the metal material melt is applied coaxial pulsed magnetic field and superconducting intense magnetic field in the same way, control crystallite dimension and crystal orientation.
As shown in Figure 1, A, B, C represent that the resultant field that adopts the inventive method to finish applies order and mode: A. applies pulsed magnetic field earlier, apply superconducting intense magnetic field again; B. apply pulsed magnetic field and superconducting intense magnetic field simultaneously; C. apply superconducting intense magnetic field earlier, apply pulsed magnetic field again.Empty arrow D, E represent that the single magnetic field that applies in other prior art applies mode: D. only applies pulsed magnetic field; E. only apply superconducting intense magnetic field.
The device of using metal material high-temperature processing method under the resultant field of the present invention as shown in Figure 2.Ingot 1 is bar-shaped, diameter 5-15mm, length 10-50mm.The boiler tube of heating furnace body 2 inside is made of the refractory ceramics pipe, furnace chamber diameter 15-20mm, length 75-100mm.The high-temperature heater silk is wrapped in the boiler tube outside, constitutes the tubulose body of heater.Ingot 1 is positioned in the heating furnace chamber, and the position is fixed between upper limit position block 9 and the lower position block 10.Thermocouple 8 penetrates in the vertical blind hole of upper limit position block 9 near ingot 1 place, the variations in temperature of ingot 1 is measured in real time in 8 pairs of devices of thermocouple course of work, and temperature value is transferred to heating control system 11 by lead, heating control system 11 is connected with heating furnace body 2 by lead again, adjust the energising and the off-position of heating furnace body 2 in real time, reach the fusing of control ingot 1 and the purpose of process of setting.Heating furnace body (2), pulse magnet (3) and superconducting magnet (4) three's central axes, successively nested from inside to outside.Be with an internal diameter 40-50mm in the outside of heating furnace body 2, external diameter 60-70mm, the pulse magnet 3 of length 75-100mm solenoid structure, the coil method of pulse magnet 3 adopts the fine copper lead of rectangular cross sectional shape.Be with a superconducting magnet 4 in the outside of pulse magnet 3, superconducting magnet 4 adopts the Nb-Ti solenoid structure.Pulse magnet 3 and superconducting magnet 4 compound generation pulsed magnetic field and superconducting intense magnetic fields, two magnetic fields can be opened in processing procedure simultaneously, also can open respectively.The magnetic direction that pulse magnet 3 and superconducting magnet 4 produce respectively all is parallel to the central axis direction of heating furnace body 2; Between heating furnace body 2, pulse magnet 3 and superconducting magnet 4 threes complicated tubulose water collar 5 is housed, the heat that sends during with reduction heating furnace body 2, pulse magnet 3 and superconducting magnet 4 work is to the influence of other parts.The material of water collar 5 is a magnetism-free stainless steel.Between heating furnace body 2 and water collar 5, be filled with the heat-preservation cotton of thickness, guarantee the temperature in heating furnace body 2 furnace chambers, anti-leak-stopping heat greater than 5mm.In the top and bottom of apparatus of the present invention upper cover plate 7 and lower cover 6 are arranged respectively, position fixing whole device feature.Be placed with heating control system 11, pulse magnet power supply 12, superconducting magnet power supply 13 and recirculated cooling water equipment 14 in the outside of apparatus of the present invention.Wherein, heating control system 11 by the energising and the off-position of real-time adjustment heating furnace body 2, reaches the fusing of control ingot 1 and the purpose of process of setting according to the temperature value of thermocouple 8 feedbacks; Pulse magnet power supply 12 is according to outside regulating command, and the control of pulse magnetic field is finished in the control of the duty by paired pulses magnet 3.Superconducting magnet power supply 13 is according to outside regulating command, by the control to the duty of superconducting magnet 4, finishes the control to superconducting intense magnetic field.Recirculated cooling water equipment 14 is in the whole device course of work, carry out cool cycles by the water that will be installed in the cooling water collar 5 between heating furnace body 2, pulse magnet 3 and the superconducting magnet 4, finish cooling, guarantee safe operation heating furnace body 2, pulse magnet 3 and superconducting magnet 4.The major parameter of pulse magnet power supply 12 is: pulse voltage 500-5000V, power capacitor 8-600 μ F, energy storage value 72J, concussion frequency 200-3000Hz, discharge current 0-600A, discharge frequency 0-10Hz.
This method and device can be used for the high-temperature process of metal material process of setting crystalline phase organizational controls, in the implementation process, at first ingot 1 are cut into the bar-shaped of given size; Bar-shaped ingot 1 is positioned in heating furnace body 2 furnace chambers of apparatus of the present invention, is warming up to more than the fusing point, be incubated subsequently to ingot 1 and melt fully; Control heating furnace body 2 makes ingot 1 melt begin cooling,, while or difference unbalanced pulse magnet 3 and superconducting magnet 4 apply coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to melt; After treating that ingot 1 solidifies, close pulsed magnetic field and superconducting intense magnetic field, obtain the tiny metal material consistent of crystallite dimension with crystal orientation.
The Al-6.5Bi monotectic alloy solidifies preparation under the resultant field.High-purity Bi with 99.99% and high-purity Al of 99.99% join by Al-6.5Bi (wt.%) alloying component, and the spillikin that is cast into Φ 10 * 20mm is as sample.Sample is put into the furnace chamber position of this device.Heating furnace body is warmed up to 1000 ℃ in the high temperature treating device, makes that solute fully dissolves each other in the solution.Cool the temperature to 790 ℃ of solid-liquid two-phase region positions, unbalanced pulse magnetic field, parameter: axial pulsed magnetic field, pulse current 300A, frequency 4Hz.Treat that temperature reduces near 657 ℃, close pulsed magnetic field, open superconducting intense magnetic field, parameter: axial magnetostatic field, magnetic field intensity 6T.Treat that temperature reduces near 270 ℃, alloy solidifies fully, closes superconducting intense magnetic field, and it is tiny to obtain matrix grain, the monotectic alloy that rich Bi uniform particles distributes.
The Zn-2Cu Peritectic Alloy solidifies preparation under the resultant field.High-purity Bi with 99.9% and high-purity Al of 99.9% join by Al-2Cu (wt.%) alloying component, and the spillikin that is cast into Φ 10 * 20mm is as sample.Sample is put into the furnace chamber position of this device.Heating furnace body is warmed up to 640 ℃ in the high temperature treating device, makes that solute fully dissolves each other in the solution.Superconducting intense magnetic field and pulsed magnetic field are opened, parameter: superconducting intense magnetic field intensity 6T simultaneously near solid-liquid two-phase region position cooling the temperature to 500 ℃; Pulsed magnetic field pulse current 300A, frequency 4Hz.Treat that temperature reduces near 425 ℃, alloy solidifies fully, closes superconducting intense magnetic field and pulsed magnetic field, and it is tiny to obtain matrix grain, the monotectic alloy that rich Cu uniform particles distributes.
Claims (4)
1. metal material high-temperature processing method under the resultant field is characterized in that in the metal material process of setting, and metal bath is applied coaxial pulsed magnetic field and superconducting intense magnetic field in the same way, control crystallite dimension and crystal orientation.
2. metal material high-temperature processing method under the resultant field according to claim 1 is characterized in that may further comprise the steps:
1) at first ingot (1) is cut into the bar-shaped of given size;
2) bar-shaped ingot (1) is positioned in heating furnace body (2) furnace chamber, is warming up to more than the fusing point, be incubated subsequently to ingot (1) and melt fully;
3) control heating furnace body (2) makes ingot (1) melt begin cooling, and while or difference unbalanced pulse magnet (3) and superconducting magnet (4) apply coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to melt;
4) treat that ingot (1) solidifies after, close pulsed magnetic field and superconducting intense magnetic field, obtain the tiny metal material consistent of crystallite dimension with crystal orientation.
3. application rights requires the device of metal material high-temperature processing method under the 1 described resultant field, it is characterized in that comprising heating furnace body (2), pulse magnet (3), superconducting magnet (4), water collar (5), lower cover (6), upper cover plate (7), thermocouple (8), upper limit position block (9), lower position block (10), heating control system (11), pulse magnet power supply (12), superconducting magnet power supply (13) and circulating water equipment (14); The inner boiler tube of heating furnace body (2) is made of the refractory ceramics pipe, and the high-temperature heater silk is wrapped in the boiler tube outside, constitutes the tubulose body of heater; Heating furnace body (2), pulse magnet (3) and superconducting magnet (4) three's central axes, successively nested from inside to outside; Pulse magnet (3) is centered around the outside of heating furnace body (2), and pulse magnet (3) is a solenoid structure; Superconducting magnet (4) is enclosed within the outside of pulse magnet (3), and superconducting magnet (4) adopts the magnetic plug structure; Water collar (5) is complicated cylindric, the axial longitudinal section of body is " M " shape, water collar (5) installation site makes cooling water flow that heating furnace body (2), pulse magnet (3) and superconducting magnet (4) three are separated each other between heating furnace body (2), pulse magnet (3) and superconducting magnet (4) three; Gap between heating furnace body (2) and the water collar (5) is filled with heat-preservation cotton; Upper cover plate (7) and lower cover (6) lay respectively at the upper and lower end of device, position fixing to whole device feature; Upper limit position block (9) is positioned between upper cover plate (7) and the heating furnace body (2); Lower position block (10) is positioned between lower cover (6) and the heating furnace body (2); Thermocouple (8) penetrates in the vertical blind hole of upper limit position block (9) and locates near ingot (1); In the device outside heating control system (11), pulse magnet power supply (12), superconducting magnet power supply (13) and recirculated cooling water equipment (14) are installed; Heating control system (11) is connected with heating furnace body (2) with thermocouple (8) respectively by lead; Pulse magnet power supply (12) is connected with pulse magnet (3) by lead; Superconducting magnet power supply (13) is connected with superconducting magnet (4) by lead; Circulating water equipment (14) is connected with the upper/lower terminal of water collar (5) respectively by water pipe.
4. metal material high temperature treating device under the resultant field according to claim 3, the coil method that it is characterized in that described pulse magnet (3) is the pure copper wire of square-section; The superconducting wire of superconducting magnet (4) is the Nb-Ti alloy material; The making material of water collar (5) is a magnetism-free stainless steel.
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| CN102658367B (en) * | 2012-05-16 | 2014-12-10 | 上海大学 | Method and device for preparing high-silicon silicon steel sheet in static magnetic field with powder sintering method |
| CN103968968A (en) * | 2014-04-02 | 2014-08-06 | 上海大学 | Device for measuring thermal historical curve of melt under action of pulse magneto-oscillation |
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| CN104148620B (en) * | 2014-08-11 | 2016-07-06 | 宁波金田铜业(集团)股份有限公司 | The crystal fining method of a kind of brass alloys and device thereof |
| CN108971460A (en) * | 2018-08-22 | 2018-12-11 | 上海大学 | A kind of method and device of pulse-couple electromagnetic field thinning metal solidification texture |
| CN110118679A (en) * | 2019-04-30 | 2019-08-13 | 西北工业大学 | A kind of temperature is up to 1600 DEG C of magnetic field material processing unit |
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