CN107971474A - A kind of method for improving the high silicon steel composite plate magnetic property of gradient - Google Patents
A kind of method for improving the high silicon steel composite plate magnetic property of gradient Download PDFInfo
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- CN107971474A CN107971474A CN201711207117.7A CN201711207117A CN107971474A CN 107971474 A CN107971474 A CN 107971474A CN 201711207117 A CN201711207117 A CN 201711207117A CN 107971474 A CN107971474 A CN 107971474A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1227—Warm rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
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Abstract
A kind of method for improving the high silicon steel composite plate magnetic property of gradient, the strand of high silicon steel composite plate is prepared using the method for cladding casting；Strand is forged and pressed and hot rolling, warm-rolling is carried out to the composite plate after hot rolling, diffusion annealing heat treatment is carried out after warm-rolling；Residual heat insulation again；Quenching cooling：Temper：Pickling finally removes composite plate rolling deformation at room temperature after iron scale；The present invention proposes that a kind of waste heat using in the diffusion annealing heat treatment link prepared during the high silicon steel composite plate of gradient is kept the temperature, and combination can suppress the type of cooling of ordering transition and eliminate the links such as the lonneal of local residual stress, by the temperature-room type plasticity that the high silicon steel composite plate of gradient can be significantly improved after above-mentioned heat treatment process, and then reduce the appearance of underbead crack, it ensure that the integrality of microstructure and continuously wash, so that the magnetic property of the alloy is improved.
Description
Technical field
The present invention relates to metallicl magnetic material processing technology of preparing field, more particularly to a kind of raising high silicon steel of gradient is compound
The method of plate magnetic property.
Background technology
Silicon steel is also referred to as electrical sheet, is the media material to change between magnetic energy and electric energy；High silicon steel is generally referred to as
The content of element silicon in the alloy is more than 3.5% (mass percent, similarly hereinafter).Increase the content of element silicon in common silicon steel,
The soft magnet performance of alloy will substantially increase, and such as magnetic conductivity and resistance rise, magnetostriction coefficient reduce, iron loss reduces.The conjunction
It is indispensable to be increasingly becoming electronics, electric power and army's industry due to excellent soft magnet performance in the development of modern science and technology for gold
The equipment such as magnetically soft alloy material, the magnetic shielding device and high-speed high frequency motor that are commonly used to prepare under transformer, high frequency.
The core component of above-mentioned power equipment is prepared using high silicon steel, the noise that device can be greatly lowered to environment is dirty
Dye and energy loss, can mitigate the weight of equipment itself and reduce space [Phway T P, the Moses A that equipment is stood
J.Magnetostriction trend of non-oriented gradient Si-Fe.Journal of Magnetism and
Magnetic Materials,2008,320(20):e611-e613].However, high silicon steel at room temperature have significant brittleness,
Plastic deformation ability is very poor, causes the alloy to be difficult to produce the plate met needed for high-performance iron core using conventional preparation method
Material.
The important step prepared as metal material in process is heat-treated, the technique is by controlling metal material
Microstructure morphology, alloying elements distribution, internal structure and phase constituent change etc. so that metal material is not changing
On the premise of overall appearance shape and alloying component, different performances is obtained.
There is the order degree size of ordered phase with its brittleness at room temperature in high si fe alloy directly contacts, i.e., the degree of order is got over
Height, the brittleness of the alloy is more notable, and the crackle occurred after deformation at room temperature inside alloy is more.It is main in high si fe alloy to include three
Kind microstructure：1. unordered BCC structures, 2. orderly B2 structures, the 3. higher D0 of the degree of order3Structure [equal product of woods etc.
.6.5wt%Si high silicon steel flat cold-rolled sheet preparation process, structure and performance front line sciences, 2007,2 (2):13-26].High silicon steel
The hot forming blank silicon content of alloy between 5.0-6.0%, at 850 DEG C keep the temperature 60min after by brine ice (or oil
Medium) after quenching treatment, its plasticity significantly improves, it is possible to achieve the low-temperature deformation of multi-pass；But it is more than for silicon content
6.0% hot forming blank, occurs substantial amounts of crackle after identical heat treatment process, in alloy and cannot further carry out
Low-temperature deformation [Shin J, Lee Z H, et al.The effect of casting method and heat treating
condition on cold workability of high-Si electrical steel.Scripta Materialia,
2001,45(6):725-731].The transformation of order-disorder structure influences the machining property of the alloy in high si fe alloy
It is very big.The high silicon steel plate of rolled of thickness about 1mm carries out brine hardening processing after 150min is kept the temperature at 850 DEG C, the alloy
The degree of order is reduced so that its brittleness is improved, and then its plasticity significantly improves that [Liang Yongfeng, waits heat treatments to Fe-
The influence material heat treatment journals of 6.5wt%Si alloy flat cold-rolled sheet tissues and magnetic property, 2009,30 (2):85-88].High silicon
The internal flaw of steel alloy will result directly in the reduction of its magnetic property (appearance of such as crackle can reduce the movement of magnetic domain)
[Matsumura S,Tanaka Y,Koga Y,et al.Concurrent ordering and phase separation
in the vicinity of the metastable critical point of order-disorder transition
in Fe-Si alloys.Materials Science and Engineering A,2001,312(1):284-292]。
The content of the invention
The defects of in order to overcome the above-mentioned prior art, it is compound to improve the high silicon steel of gradient it is an object of the invention to provide one kind
The method of plate magnetic property, the method carry out the defects of plastic deformation produces to reduce the composite plate, ensure that this is compound at room temperature
The integrality and continuity of intralamellar part microstructure, to reduce the unfavorable factor for influencing domain motion so that the magnetic for improving the plate
Learn performance.
In order to achieve the above object, the technical scheme is that：
A kind of method for improving the high silicon steel composite plate magnetic property of gradient, comprises the following steps：
(a) sandwich layer strand：The melting of sandwich layer carries out in vacuum electromagnetic induction heater, and raw material is silicon content 3%
Common silicon steel and the industrial silico briquette that silicon content is 99.9%, smelting temperature obtain element silicon and contain between 1550-1600 DEG C
Measure the sandwich layer strand solution for 10%-15%；
(b) cladding casting：To being cut after the cooling such as sandwich layer strand solution for being obtained in step (a) using wire cutting with one
The rectangular block being sized, the rectangular block of sandwich layer are in vacant state in casting die by pad support, and gasket material is common
Silicon steel, carries out cladding casting in vacuum electromagnetic induction heater, and cladding raw material is common silicon steel, and smelting temperature is in 1500-
Between 1550 DEG C；
(c) forge and press：The composite plate strand obtained in step (b) is forged and pressed, heating-up temperature for 1150-1200 DEG C it
Between, 50-90min is kept the temperature, between forging and stamping temperature is 950-1150 DEG C, drafts 25-40%, the thickness of composite plate is not after forging and stamping
The upper limit is bitten more than hot-rolling mill；
(d) hot rolling：Hot rolling is carried out to the composite plate in step (c), between 1200-1250 DEG C of heating-up temperature, keeps the temperature 40-
60min, between hot-rolled temperature is 900-1200 DEG C, the first reduction in pass is not less than 50%；
(e) warm-rolling：Warm-rolling is carried out to the composite plate in step (d), between 550-650 DEG C of heating-up temperature, keeps the temperature 30-
50min, between warm-rolling temperature is 500-650 DEG C, the first reduction in pass is not more than 20%；
(f) diffusion annealing：Annealing heat-treats are diffused to the composite plate in step (e), are carried out in Sealing furnace, are heated
Temperature be 1180-1200 DEG C between, soaking time 30-120min, vacuumizes before diffusion, by control different heating-up temperatures and
Soaking time, prepares the high silicon steel composite plate of different silicone content distribution gradients；
(g) residual heat insulation：Residual heat insulation is carried out to the composite plate in step (f), after diffusion annealing heat treatment more than guarantee
High temperature field temperature keeps the temperature 30-100min between 900-1000 DEG C；
(h) quenching cooling：Quenching cooling treatment is carried out to the composite plate in step (g), is cooled to room temperature using medium, it is cold
Speed is 200-250 DEG C/s, and medium includes cool brine；
(i) temper：Temper is carried out to the composite plate in step (h), is heated between 200-250 DEG C, at the same time
30-60min is kept the temperature, is air-cooled to room temperature；
(j) pickling：Pickling is carried out to the composite plate in step (i), is gone using the aqueous hydrochloric acid solution of mass fraction 8-15%
Except the iron scale on surface, prepare for plate shape, surface quality and the brightness after the composite plate cold rolling；
(k) cold rolling：Carry out rolling deformation at room temperature to the composite plate in step (j), the first pass deformation is not more than
15%, multi- pass rolling is carried out to composite plate so that its thickness is thinned.
Consider the high silicon steel composite plate various change factor in heat treatment process of gradient of lamellar composite technology preparation
Influence to each layer tissue of composite plate and phase, and then influence temperature-room type plasticity (turn of such as ordered phase degree of order of composite plate entirety
Become, the secondary phase of the concentration of local residual stress, grain boundaries separates out etc.).The present invention proposes that a kind of utilize prepares the high silicon steel of gradient
The waste heat in diffusion annealing heat treatment link during composite plate is kept the temperature, and combination can suppress the cooling of ordering transition
The links such as the lonneal of mode and the local residual stress of elimination, by the way that gradient can be significantly improved after above-mentioned heat treatment process
The temperature-room type plasticity of high silicon steel composite plate, and then reduce the appearance of underbead crack, ensure that the integrality of microstructure and continuous
Wash, so that the magnetic property of the alloy is improved.
The advantage of the invention is that：
The raising for the high silicon steel composite plate magnetic property of gradient that the present invention is prepared for lamellar composite technology, utilizes the alloy system
The temperature field waste heat of diffusion annealing process in standby process carries out interim insulation, so as to reduce the work reheated
Sequence so that flow is simplified, the energy is saved.By to holding temperature, soaking time, cooling medium, cooldown rate
Selection and control, can suppress the transformation of ordered phase in high-silicon alloy, reduce precipitation phase amount, reduce the degree of order, prevent crystal grain
Too grow up, by being plastically deformed the reduction of unfavorable factor, the rational temperature of simultaneous selection at room temperature to the alloy
The degree of oxidation of composite surface can be reduced with soaking time and eliminates residual stress, so as to ensure that composite plate is moulded in room temperature
Property deformation process in microstructure integrality and continuity, with reduce hinder domain motion unfavorable factor, and then improve should
The magnetic performance of alloy.This invention is internal scarce to reduce by lifting the temperature-room type plasticity deformability of the high silicon steel composite plate of gradient
Sunken generation, improves the magnetic property of the alloy with this, this heating and cooling procedure are easy to operate, easily controllable, has extensive
Application prospect.
Brief description of the drawings：
Heat treatment process schematic diagram in Fig. 1 embodiments.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Embodiment one
With reference to Fig. 1, the present embodiment comprises the following steps：
(a) sandwich layer strand：The melting of sandwich layer carries out in vacuum electromagnetic induction heater, and raw material is silicon content 3%
Common silicon steel and the industrial silico briquette that silicon content is 99.9%, smelting temperature obtain silicon content as 10% at 1550 DEG C
Sandwich layer strand solution；
(b) cladding casting：To being cut after the cooling such as sandwich layer strand solution for being obtained in step (a) using wire cutting with one
The rectangular block being sized, the rectangular block of sandwich layer are in vacant state in casting die by pad support, and gasket material is common
Silicon steel, carries out cladding casting in vacuum electromagnetic induction heater, and cladding raw material is common silicon steel, smelting temperature 1550 DEG C it
Between；
(c) forge and press：The composite plate strand obtained in step (b) is forged and pressed, heating-up temperature is 1150 DEG C, insulation
50min, between forging and stamping temperature is 950-1150 DEG C, drafts 25-40%, the thickness of composite plate is not more than hot-rolling mill after forging and stamping
Bite the upper limit；
(d) hot rolling：Hot rolling is carried out to the composite plate in step (c), 1200 DEG C of heating-up temperature, keeps the temperature 45min, hot-rolled temperature
Between 900-1200 DEG C, the first reduction in pass is not less than 50%, and compound plate thickness is 2mm after hot rolling；
(e) warm-rolling：Warm-rolling is carried out to the composite plate in step (d), 650 DEG C of heating-up temperature, keeps the temperature 40min, warm-rolling temperature
Between 500-650 DEG C, the first reduction in pass is not more than 20%, and compound plate thickness is 0.25mm after warm-rolling；
(f) diffusion annealing：Annealing heat-treats are diffused to the composite plate in step (e), are carried out in Sealing furnace, are spread
Before vacuumize, heating-up temperature be 1200 DEG C, soaking time 45min；
(g) residual heat insulation：Residual heat insulation is carried out to the composite plate in step (f), temperature is carried out after diffusion annealing heat treatment
Drop, ensures temperature field at 1000 DEG C or so, and keeps the temperature 30min；
(h) quenching cooling：Quenching cooling treatment is carried out to the composite plate in step (g), is cooled to room temperature using medium, it is cold
Speed is 200-250 DEG C/s, and medium is cool brine；
(i) temper：Temper is carried out to the composite plate in step (h), 250 DEG C is heated to and keeps the temperature 30min, it is air-cooled
To room temperature；
(j) pickling：Pickling is carried out to the product in step (i), table is removed using mass fraction 8-15% aqueous hydrochloric acid solutions
The iron scale in face, prepares for template, surface quality and the brightness after the composite plate cold rolling；
(k) cold rolling：Rolling deformation is carried out at room temperature to the composite plate of step (j), the first pass deformation is not more than
15%, multi- pass rolling is carried out to composite plate so that its thickness is thinned, the thickness of composite plate is 0.10mm after cold rolling.
Observed by metallographic structure, compared with the cold rolling style without above-mentioned heat treatment process, the former sample room temperature
Plasticity is substantially improved, internal flaw is reduced, its microstructure integrality and continuity are more preferable, so that magnetic property is more preferably (such as
Shown in table 1).Table 1 is through Overheating Treatment and the identical index contrast of magnetic property without heat treatment sample.
Table 1
Embodiment two
With reference to Fig. 1, the present embodiment comprises the following steps：
(a) sandwich layer strand：The melting of sandwich layer carries out in vacuum electromagnetic induction heater, and raw material is silicon content 3%
Common silicon steel and the industrial silico briquette that silicon content is 99.9%, smelting temperature obtain silicon content as 11% at 1550 DEG C
Sandwich layer strand solution；
(b) cladding casting：To being cut after the cooling such as sandwich layer strand solution for being obtained in step (a) using wire cutting with one
The rectangular block being sized, the rectangular block of sandwich layer are in vacant state in casting die by pad support, and gasket material is common
Silicon steel, carries out cladding casting in vacuum electromagnetic induction heater, and cladding raw material is common silicon steel, smelting temperature 1550 DEG C it
Between；
(c) forge and press：The composite plate strand obtained in step (b) is forged and pressed, heating-up temperature is 1150 DEG C, insulation
60min, between forging and stamping temperature is 950-1150 DEG C, drafts 25-40%, the thickness of composite plate is not more than hot-rolling mill after forging and stamping
Bite the upper limit；
(d) hot rolling：Hot rolling is carried out to the composite plate in step (c), 1200 DEG C of heating-up temperature, keeps the temperature 60min, hot-rolled temperature
Between 900-1200 DEG C, the first reduction in pass is not less than 50%, and compound plate thickness is 2mm after hot rolling；
(e) warm-rolling：Warm-rolling is carried out to the composite plate in step (d), 650 DEG C of heating-up temperature, keeps the temperature 45min, warm-rolling temperature
Between 500-650 DEG C, the first reduction in pass is not more than 20%, and compound plate thickness is 0.22mm after warm-rolling；
(f) diffusion annealing：Annealing heat-treats are diffused to the composite plate in step (e), are carried out in Sealing furnace, are spread
Before vacuumize, heating-up temperature be 1200 DEG C, soaking time 50min；
(g) residual heat insulation：Residual heat insulation is carried out to the composite plate in step (f), temperature is carried out after diffusion annealing heat treatment
Drop, ensures temperature field at 1000 DEG C or so, and keeps the temperature 40min；
(h) quenching cooling：Quenching cooling treatment is carried out to the composite plate in step (g), is cooled to room temperature using medium, it is cold
Speed is 200-250 DEG C/s, and medium is cool brine；
(i) temper：Temper is carried out to the composite plate in step (h), 250 DEG C is heated to and keeps the temperature 35min, it is air-cooled
To room temperature；
(j) pickling：Pickling is carried out to the product in step (i), table is removed using mass fraction 8-15% aqueous hydrochloric acid solutions
The iron scale in face, prepares for template, surface quality and the brightness after the composite plate cold rolling；
(k) cold rolling：Rolling deformation is carried out at room temperature to the composite plate of step (j), the first pass deformation is not more than
15%, multi- pass rolling is carried out to composite plate so that its thickness is thinned, the thickness of composite plate is 0.15mm after cold rolling.
Observed by metallographic structure, compared with the cold rolling style without above-mentioned heat treatment process, the former sample room temperature
Plasticity is substantially improved, internal flaw is reduced, its microstructure integrality and continuity are more preferable, so that magnetic property is more preferably (such as
Shown in table 2).Table 2 is through Overheating Treatment and the identical index contrast of magnetic property without heat treatment sample.
Table 2
Embodiment three
With reference to Fig. 1, the present embodiment comprises the following steps：
(a) sandwich layer strand：The melting of sandwich layer carries out in vacuum electromagnetic induction heater, and raw material is silicon content 3%
Common silicon steel and the industrial silico briquette that silicon content is 99.9%, smelting temperature obtain silicon content as 15% at 1550 DEG C
Sandwich layer strand solution；
(b) cladding casting：To being cut after the cooling such as sandwich layer strand solution for being obtained in step (a) using wire cutting with one
The rectangular block being sized, the rectangular block of sandwich layer are in vacant state in casting die by pad support, and gasket material is common
Silicon steel, carries out cladding casting in vacuum electromagnetic induction heater, and cladding raw material is common silicon steel, smelting temperature 1550 DEG C it
Between；
(c) forge and press：The composite plate strand obtained in step (b) is forged and pressed, heating-up temperature is 1150 DEG C, insulation
60min, between forging and stamping temperature is 950-1150 DEG C, drafts 25-40%, the thickness of composite plate is not more than hot-rolling mill after forging and stamping
Bite the upper limit；
(d) hot rolling：Hot rolling is carried out to the composite plate in step (c), 1200 DEG C of heating-up temperature, keeps the temperature 50min, hot-rolled temperature
Between 900-1200 DEG C, the first reduction in pass is not less than 50%, and compound plate thickness is 2mm after hot rolling；
(e) warm-rolling：Warm-rolling is carried out to the composite plate in step (d), 650 DEG C of heating-up temperature, keeps the temperature 45min, warm-rolling temperature
Between 500-650 DEG C, the first reduction in pass is not more than 20%, and compound plate thickness is 0.20mm after warm-rolling；
(f) diffusion annealing：Annealing heat-treats are diffused to the composite plate in step (e), are carried out in Sealing furnace, are spread
Before vacuumize, heating-up temperature be 1200 DEG C, soaking time 60min；
(g) residual heat insulation：Residual heat insulation is carried out to the composite plate in step (f), temperature is carried out after diffusion annealing heat treatment
Drop, ensures temperature field at 1000 DEG C or so, and keeps the temperature 45min；
(h) quenching cooling：Quenching cooling treatment is carried out to the composite plate in step (g), is cooled to room temperature using medium, it is cold
Speed is 200-250 DEG C/s, and medium is cool brine；
(i) temper：Temper is carried out to the composite plate in step (h), 250 DEG C is heated to and keeps the temperature 35min, it is air-cooled
To room temperature；
(j) pickling：Pickling is carried out to the product in step (i), table is removed using mass fraction 8-15% aqueous hydrochloric acid solutions
The iron scale in face, prepares for template, surface quality and the brightness after the composite plate cold rolling；
(k) cold rolling：Rolling deformation is carried out at room temperature to the composite plate of step (j), the first pass deformation is not more than
15%, multi- pass rolling is carried out to composite plate so that its thickness is thinned, the thickness of composite plate is 0.12mm after cold rolling.
Observed by metallographic structure, compared with the cold rolling style without above-mentioned heat treatment process, the former sample room temperature
Plasticity is substantially improved, internal flaw is reduced, its microstructure integrality and continuity are more preferable, so that magnetic property is more preferably (such as
Shown in table 3).Table 3 is through Overheating Treatment and the identical index contrast of magnetic property without heat treatment sample.
Table 3
Claims (1)
1. a kind of method for improving the high silicon steel composite plate magnetic property of gradient, comprises the following steps：
(a) sandwich layer strand：The melting of sandwich layer carries out in vacuum electromagnetic induction heater, and raw material is common for silicon content 3%
Silicon steel and the industrial silico briquette that silicon content is 99.9%, between 1550-1600 DEG C, obtain silicon content is smelting temperature
The sandwich layer strand solution of 10%-15%；
(b) cladding casting：To being cut after the cooling such as sandwich layer strand solution for being obtained in step (a) using wire cutting with a scale
Very little rectangular block, the rectangular block of sandwich layer are in vacant state in casting die by pad support, and gasket material is common silicon steel,
Carry out cladding casting in vacuum electromagnetic induction heater, cladding raw material is common silicon steel, smelting temperature 1500-1550 DEG C it
Between；
(c) forge and press：The composite plate strand obtained in step (b) is forged and pressed, between heating-up temperature is 1150-1200 DEG C, is protected
Warm 50-90min, between forging and stamping temperature is 950-1150 DEG C, drafts 25-40%, the thickness of composite plate is not more than after forging and stamping
Hot-rolling mill bites the upper limit；
(d) hot rolling：Hot rolling is carried out to the composite plate in step (c), between 1200-1250 DEG C of heating-up temperature, keeps the temperature 40-60min,
Between hot-rolled temperature is 900-1200 DEG C, the first reduction in pass is not less than 50%；
(e) warm-rolling：Warm-rolling is carried out to the composite plate in step (d), between 550-650 DEG C of heating-up temperature, keeps the temperature 30-50min, temperature
Temperature is rolled between 500-650 DEG C, the first reduction in pass is not more than 20%；
(f) diffusion annealing：Annealing heat-treats are diffused to the composite plate in step (e), are carried out in Sealing furnace, heating-up temperature
Between 1180-1200 DEG C, soaking time 30-120min, vacuumizes before diffusion, by controlling different heating-up temperatures and insulation
Time, prepares the high silicon steel composite plate of different silicone content distribution gradients；
(g) residual heat insulation：Residual heat insulation is carried out to the composite plate in step (f), ensures waste heat temperature after diffusion annealing heat treatment
Field temperature is spent between 900-1000 DEG C, while keeps the temperature 30-100min；
(h) quenching cooling：Quenching cooling treatment is carried out to the composite plate in step (g), is cooled to room temperature using medium, cooling rate is
200-250 DEG C/s, medium includes cool brine；
(i) temper：Temper is carried out to the composite plate in step (h), is heated between 200-250 DEG C, keeps the temperature at the same time
30-60min, is air-cooled to room temperature；
(j) pickling：Pickling is carried out to the composite plate in step (i), table is removed using the aqueous hydrochloric acid solution of mass fraction 8-15%
The iron scale in face, prepares for plate shape, surface quality and the brightness after the composite plate cold rolling；
(k) cold rolling：Carrying out rolling deformation at room temperature to the composite plate in step (j), the first pass deformation is not more than 15%,
Multi- pass rolling is carried out to composite plate so that its thickness is thinned.
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