CN104846219B - A kind of preparation facilitiess of metal semisolid blank and preparation method thereof - Google Patents
A kind of preparation facilitiess of metal semisolid blank and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of preparation facilitiess of metal semisolid blank and preparation method thereof, belong to metal material and metallurgical technology field.A kind of preparation facilitiess of the metal semisolid blank of the present invention, including heating arrangements, crucible and hoistable platform, wherein, described heating arrangements include alternating current power supply and heating coil, heating coil is connected with alternating current power supply by wire, and above-mentioned heating coil includes first coil and the second coil；Crucible is fixed on hoistable platform and is placed in first coil and the second coil inside；A kind of preparation method of the metal semisolid blank of the present invention, including circulation re melting process operation, its circulation re melting process mainly passes through alternately to close first coil and the second coil, its semi-solid temperature is interval to control the central temperature of metal bath to be in, up and down cyclically mobile crucible carrying out.By using the present invention, pure free of contamination metal semisolid blank, equipment and simple to operate, low cost can be obtained, be widely used in various alloy materials.
Description
Technical field
The invention belongs to metal material and metallurgical technology field, more particularly, to a kind of system of metal semisolid blank
Standby device and preparation method thereof.
Background technology
The semi-solid state forming technique of metal alloy compositions is a kind of advanced material growing up nineteen seventies
Material forming technique, it combines the strong point of solidification processing and plastic working, and that is, processing temperature is lower than liquid, resistance of deformation compares solid-state
Little, can therefore be referred to as 21 generation once so that aximal deformation value shaping form is complicated and precision and the higher part of performance quality requirements
The most promising material forming processing method of discipline.Compared to traditional Founding moldability technology, had by the foundry goods that this method produces
The advantages of defects such as allowance is few, even tissue, crystal grain are tiny, shrinkage cavity and shrinkage porosite are less.According to the difference of process route, half
Solid molding technology can be divided into rheological molding (Rheocasting) and thixotropic forming (Thixocasting) two big class.Wherein,
Rheological molding refers to for blank directly to form processing under semi-solid temperature, and thixotropic forming refers to that rheological slurry cooling is solidifying
Gu after will carry out follow-up forming again under its post bake to semi-solid temperature, this two classes technology is each advantageous, takes
There is larger difference in technology path, but they have a common link, that is, must prepare first have uniformly,
The semi solid slurry of tiny non-dendritic structure or blank, namely promote the dendrite that alloy is formed in process of setting to be changed into
Globular crystal, and the inside being evenly distributed in whole melt can be compared.The preparation of semi-solid blank/slurry is that semisolid becomes
One of key link in shape technology, is also to limit one of important step of this technology development.
Method for preparing metal semisolid blank has a lot, the fundamental mechanism being formed according to microstructure of semisolid, substantially
They two big class be can be divided into, a class is in solidification/cooling procedure, stirring, vibration, fast quickly cooling included by certain means
But or heterogeneous nucleating agent etc. is to suppress the growth of dendrite, promote the formation of spheric grain；One class is in the solid state, by certain
Means such as large deformation, recrystallization etc., to destroy original as-cast structure, promote the formation of small grains.Wherein, compare at present
The preparation method of conventional metal semisolid blank mainly includes following several：
(1) mechanical mixing method the method is the technology of preparing of the semi solid slurry/blank being applied to metal material earliest, its
Principle is exactly to interrupt, using strong mechanical force, the dendrite being formed in cooling procedure, and the temperature having simultaneously facilitated within melt is equal
Homogenize the growth it is suppressed that dendrite, finally realize crystal grain from branch pattern to spherical development, and promote crystal grain in melt
Portion is uniformly distributed.Last century the seventies Flemings and his student proposition mechanical mixing method first can obtain Sn-
The semi-solid blank of Pb alloy, thus as making a start, defines multiple mechanical agitation methods, such as United States Patent (USP) US3902544,
The method with features of the propositions such as US3948650 and US3954455, especially British scholar Z.Fan et al. propose
Double helix mechanical mixing method (Twin-screw Rheomoulding Process), achieves larger breakthrough.Stirred using machinery
Method of mixing is larger to prepare the strength stirring during semi solid slurry/blank, and throughput rate is higher, but using stirring during the method
The life-span of device is shorter and easily pollutes metal, applies less in the preparation of metal semisolid blank.
(2) electromagnetic stirring method the method is technology most widely used at present, and it overcomes above-mentioned mechanical mixing method needs to stir
The shortcoming mixing device and melt contacts, its cardinal principle is to produce induction field in molten metal using rotary electromagnetic field, gold
Belong to liquid and produce motion in the presence of Lorentz force, and by the effect of electromagnetic induction power, the dendrite separating out is crushed glomeration
Warp, this technology takes full advantage of electromagnetic field as the means of stirring it is achieved that contactless stirring.As United States Patent (USP)
US4434837 and US4229210 all discloses a kind of electromagnetic agitation method preparing semi-solid-state metal and alloy pulp and blank,
Tiny, uniform semi-solid-state metal and alloy slurry can be prepared by using the method in above-mentioned application case to a certain extent
Material；And for example, Chinese patent 200420112702.0 also discloses that a kind of optical ground wire method continuously prepares semi-solid metal slurry
The device of material, the primary structure of this device and principle are：Apply electromagnetic agitation in tundish, the liquid making tundish overheated is whole
Body uniform decrease in temperature, to liquidus temperature, all applies intense electromagnetic stirring, metal liquor stream can obtain fully quick outside mozzle
Cooling, makes number of nuclei be significantly increased, solidified structure substantially refines, thus can obtain organizing relatively tiny to a certain extent
Metal semisolid blank/slurry.But when adopting electromagnetic stirring method preparation metal semisolid blank in above application case, to electric energy
The larger and required device structure of consumption complicated, investment is higher, and the tissue of gained semi-solid blank is relatively uneven, from
And limit the development of this technology.
(3) strain inducing fusing Activiation method (Strain-induced Melt Activation Process) the method
Main points be to prepare the tiny strand of crystal grain first with traditional casting method, then carry out at a temperature of recovery and recrystallization
High temperature deformation, broken as-cast structure, then be aided with a small amount of cold deformation, finally again by the heating strand after predeformation to semisolid
Temperature range carries out secondary remelting and processes the semi-solid-state shaping blank needed for being obtained.As Chinese patent 201210054148.4
Disclose a kind of method that SIMA method prepares semi solid slurry, permissible to a certain extent by using the method in this application case
Prepare pure, free of contamination semi solid slurry, but more complicated using this technical operation, need to increase by one predeformation operation,
Requirement to deformation operation is higher, processing is loaded down with trivial details, production cost is high, productivity ratio is low, can only produce miniature parts.
Additionally, the preparation method of metal semisolid blank also has heat treating process, adds powder alterant method, ultrasonic activation
The method such as method and spray deposition, but the technology that can industrially be promoted the use of at present only has electromagnetic stirring method and strain
Induced melting Activiation method, and above existing semi-solid blank technology of preparing mainly in low melting point non-ferrous metal field obtain
Widely apply, especially in industry such as automobile, Aero-Space, electrical equipment.And to high-melting-point ferrous materials, due to its fusing point relatively
Height, melt conductivity is low, thus bringing very big difficulty to the preparation of semi-solid blank, power of agitator as required is big, stir
Mix time length, its heating, insulation, need good measure etc. in cooling procedure.
Through retrieval, the patent report with regard to the preparation method of the semi-solid blank of high-melting-point ferrous materials is existing related public
Open.
As：Chinese Patent Application No.：201110006232.4, invention and created name：A kind of ferrous metal semi-solid slurry
The electromagnetic agitation of preparation and vibrating composite apparatus, this application case discloses one kind and is used for preparing high-melting-point ferrous metal semi-solid slurry
The electromagnetic agitation of material and vibrating composite apparatus, by metal bath is carried out with electromagnetic agitation and vibration Combined Processing, so that branch
Brilliant broken, prepare the semi solid slurry being made up of tiny nearly spheroidal structure.This application case can be used for preparing to a certain extent
The semi-solid blank of high-melting-point ferrous materials, but its equipment and operation are more complicated, and elasticity easily occurs after vibrating spring life-time service
Losing efficacy, and thus affecting the vibrating effect of device, so that the spheroidizing effect of arborescent structure in semi-solid blank is substantially reduced.
Therefore, high-melting-point ferrous materials can be applied in the urgent need to working out one kind, and lower-cost semisolid blank
The preparation method of material.
Content of the invention
1. invent technical problem to be solved
It is an object of the invention to overcoming the technology of preparing of existing semi-solid blank to be used for preparing low-smelting-point non-ferrous alloy
Semi-solid blank it is impossible to semi-solid blank or preparation effect for preparing high-melting-point ferrous materials are poor, and device structure
And complex operation, a kind of high deficiency of cost of investment, there is provided preparation facilitiess of metal semisolid blank and preparation method thereof.Logical
Cross and can prepare various alloy materials using the preparation facilitiess of metal semisolid blank in the present invention and preparation method, especially high
The semi-solid blank of fusing point ferrous materials, and prepared semi-solid blank is pure pollution-free, equipment and simple to operate, cost is relatively
Low.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is：
First, a kind of preparation facilitiess of metal semisolid blank of the present invention, flat including heating arrangements, crucible and lifting
Platform, wherein, described heating arrangements include alternating current power supply and heating coil, and described heating coil passes through wire and alternating current power supply
It is connected, and above-mentioned heating coil includes first coil and the second coil；Described crucible is fixed on hoistable platform and is placed in
One coil and the second coil inside.
Further, it is provided with protective gas import in described crucible top.
Further, it is additionally provided with an installing hole in described crucible top, a heat is mounted with by this installing hole
Galvanic couple, and the induction end of this thermocouple extend into inside described crucible.
Further, described first coil and the second coil be using being connected in parallel, and first coil is located at the second line
The top of circle.
Second, a kind of preparation method of metal semisolid blank of the present invention it is characterised in that：Including conventional melting,
Refining treatment operation and circulation re melting process operation, wherein, circulation re melting process operation comprises the following steps：
Step one, using metal semisolid blank preparation facilitiess, simultaneously using first coil and the second coil to crucible
Middle metal bath after melting and refine carries out sensing heating, and by METAL HEATING PROCESS to its liquidus temperature TLAbove 30-
Between 80 DEG C, it is incubated 10-30min；
Step 2, reach the temperature of step one after, alternately close first coil and the second coil, control in metal bath
Heart temperature is between the liquid phase of metal alloy compositions and solidus temperature gap, i.e. TL-TSBetween；Using hoistable platform, with
The speed of 0.4m/min-1.2m/min cyclically mobile crucible up and down, carries out solidifying-the circulation of remelting-solidification to metal bath
Re melting process, that is, obtain the semi solid slurry of required metal；
After the completion of re melting process being circulated to metal bath in step 3, step 2, the semi solid slurry of gained is cooled to
Room temperature forms the semi-solid blank of required metal.
Further, during circulation re melting process in step 2, real time sample detection is carried out to metal bath, weight
To sample detection, the molten number of times processing finds that the dendrite tissue of sample is completely transformed into globular crystal as foundation.
Further, when re melting process being circulated to the metal bath after melting and refine in step 2, when upwards
Close first coil during mobile crucible to be heated using the second coil, then close the second coil when moving downward and use first
Coil is heated.
Further, when re melting process being circulated to metal bath in step 2, amplitude that crucible moves up with
The coboundary that crucible just leaves first coil is defined, and the amplitude that crucible moves down then just leaves the second coil with crucible
Lower boundary be defined.
Further, all protection is passed through by protective gas import during melting, refine and circulation re melting process
Property gas, to reduce oxidation and the air-breathing of metal bath.
Further, during re melting process is circulated to metal alloy, using thermocouple to metal bath
Temperature carries out real-time monitoring.
3. beneficial effect
The technical scheme being provided using the present invention, compared with prior art, has following remarkable result：
(1) preparation method of a kind of metal semisolid blank of the present invention, is carrying out melting, the essence of routine to metal material
After refining etc. is processed, using alternating current power supply, first coil and second coil are used alternatingly metal bath is carried out solidify with-remelting-and coagulate
Solid circulating-heating re melting process, so that the dendrite in metal bath is constantly fused, and again solidification formed tiny spherical
Crystalline substance, and in the presence of Lorentz force, energy ecto-entad gradually advances, so that dendrite fuses and relatively completely in metal bath
Uniformly, obtain uniform, fine and close metal semisolid blank；Due to can be controlled by adjusting the power of alternating current power supply in the present invention
The heating-up temperature of re melting process processed, heating-up temperature can reach high value, technically easily realizes, and therefore, the present invention is permissible
It is widely used in various alloy materials, especially also preferable to the preparation effect of high-melting-point ferrous materials semi-solid blank, thus
Overcome the more difficult technical barrier of the preparation of high-melting-point ferrous materials semi-solid blank.
(2) preparation method of a kind of metal semisolid blank of the present invention, can solve to prepare using mechanical agitation methods
During semi-solid blank, gained blank is vulnerable to pollution, the problem of agitating device short life, and gained blank is pure pollution-free, and its system
Standby device and technological operation are simple, and treatment effeciency is higher, easily realize, low cost.
Brief description
Fig. 1 is a kind of structural representation of the preparation facilitiess of metal semisolid blank of the present invention；
Fig. 2 (a) is the tissue topography of the aluminium alloy directly obtaining without Semi-solid Material Processing in embodiment 1；
Fig. 2 (b) is the tissue topography of the aluminium alloy obtaining after Semi-solid Material Processing in embodiment 1；
Fig. 3 (a) is the tissue topography of the magnesium alloy directly obtaining without Semi-solid Material Processing in embodiment 2；
Fig. 3 (b) is the tissue topography of the magnesium alloy obtaining after Semi-solid Material Processing in embodiment 2；
Fig. 4 (a) is the semi-solid tissue topography of cast iron directly obtaining without Semi-solid Material Processing in embodiment 3；
Fig. 4 (b) is the tissue topography of the cast iron obtaining after Semi-solid Material Processing in embodiment 3；
Label declaration in schematic diagram：
1st, alternating current power supply；2nd, protective gas import；3rd, thermocouple；401st, first coil；402nd, the second coil；5th, crucible；
6th, hoistable platform.
Specific embodiment
For further appreciating that present disclosure, in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment 1
As shown in figure 1, a kind of preparation facilitiess of metal semisolid blank of the present embodiment, including heating arrangements, crucible 5 and
Hoistable platform 6, wherein, above-mentioned heating arrangements include alternating current power supply 1 and heating coil, and heating coil passes through wire and alternating current power supply
1 is connected, and above-mentioned heating coil includes first coil 401 and the second coil 402, and first coil 401 and the second coil 402 adopt
It is connected in parallel, and first coil 401 is located at the top of the second coil 402；Above-mentioned crucible 5 is fixed on hoistable platform 6 and is placed in
Inside first coil 401 and the second coil 402.It is provided with protective gas import 2 and an installing hole at the top of above-mentioned crucible 5, lead to
Cross this installing hole and be mounted with a thermocouple 3, and the induction end of this thermocouple 3 extend into inside described crucible 5.
A kind of preparation method of metal semisolid blank of the present embodiment, including conventional melting, refining treatment and circulation
Re melting process operation, wherein melting, refine and circulation re melting process are all using a kind of metal semisolid blank of the present embodiment
Preparation facilitiess.Select A356 aluminium alloy as test material in the present embodiment, its liquidus temperature is 618 DEG C, solidus temperature
For 563 DEG C, when preparing the semi-solid blank of aluminium alloy in the present embodiment using the device in Fig. 1, first by A356 aluminium alloy
It is placed in crucible 5, be heated to molten state using first coil 401 and the second coil 402 simultaneously, and right at 735 DEG C
Metal bath carries out refining treatment, and Al-alloy metal melt is carried out after the completion of refining treatment with follow-up circulation re melting process work
Sequence, and in the whole process of melting, refine and circulation re melting process, protective gas Ar is passed through by protective gas import 2, with
Reduce oxidation and the air-breathing of metal bath, using thermocouple 3, real-time monitoring is carried out to the temperature of metal bath simultaneously.Above-mentioned circulation
The concretely comprising the following steps of re melting process operation：
Step one, simultaneously using first coil 401 and the second coil 402 by the aluminum after melting and refine in crucible 5
Alloying metal melt is heated to 650 DEG C, is incubated 25min；
Step 2, reach the temperature of step one after, alternately close first coil 401 and the second coil 402, control metal to melt
The central temperature of body is between the liquid phase of aluminium alloy and solidus temperature gap, that is, between 563-618 DEG C, controls in the present embodiment
Temperature maintains 590 DEG C about all the time；Using hoistable platform 6, crucible 5 is moved up and down with the speed of 0.7m/min, metal is melted
Body carries out solidifying-the circulation re melting process of remelting-solidification, and close first coil 401 when moving up crucible 5 and use second
Coil 402 is heated, and then closes the second coil 402 when moving downward and is heated using first coil 401, and crucible 5
The coboundary that the amplitude moving up just leaves first coil 401 by crucible 5 is defined, and the amplitude that crucible 5 moves down is then
It is defined by the lower boundary that crucible 5 just leaves the second coil 402, the metal bath after heating fusing is in subsequent cooling procedure
In, dendrite can be grown along the direction perpendicular to sidewall of crucible, and these dendrite occur two in subsequent heating reflow process
The fusing of secondary dendritic arm, promotes the increase of free crystal grain, so repeatedly, by the circulation reflow process of solidification-remelting-solidification
The quantity of free crystal grain can be greatly increased, these crystal grain can become the source of semisolid spheric grain；When substantial amounts of free
After grain formation, heating coil can produce Lorentz force to metal bath in the presence of alternating current, in Lorentz force
Under effect, energy ecto-entad pushes, and can order about free crystal grain makes dendrite gradually fuse to melt internal migration, so that
Dendrite in melt can be completely broken, makes the dendrite in gained semi-solid blank be completely reformed into globular crystal；In circulation remelting
Also real time sample detection is carried out to metal bath in processing procedure, when in metal bath dendrite tissue be completely transformed into spherical
When brilliant, stopping is processed, that is, obtain the semi solid slurry of aluminium alloy, and for each special metal, only need to test once can be really
The number of times of its re melting process fixed, the number of times circulating re melting process in the present embodiment is 5 times；
After the completion of re melting process being circulated to metal bath in step 3, step 2, by the aluminium alloy semi-solid slurry of gained
Air-cooled to room temperature, that is, the semi-solid blank of aluminium alloy is obtained.
Comparative example 1
In this comparative example, A356 aluminium alloy does not carry out Semi-solid Material Processing, and its preparation technology is：By A356 aluminium alloy through with
Directly poured into a mould without circulation re melting process after identical melting and refining treatment in embodiment 1.
Cut the present embodiment gained semi-solid blank and comparative example 1 metallographic specimen without Semi-solid Material Processing sample respectively,
Sample is polished, polish after observe its metallographic structure, its metallographic structure respectively as shown in Fig. 2 (a), Fig. 2 (b), contrast Fig. 2 (a),
In Fig. 2 (b), tissue is as can be seen that can make in the aluminum alloy organization before Semi-solid Material Processing by using the technical scheme that this is implemented
Dendrite completely broken, define globular crystal tissue, the effect of Semi-solid Material Processing preferably, and one kind implemented by using this
The semi-solid blank of the A356 aluminium alloy prepared by the preparation method of metal semisolid blank is pure, pollution-free, device therefor
Structurally and operationally simple, cost is relatively low.
Embodiment 2
A kind of preparation method of metal semisolid blank of the present embodiment, including conventional melting, refining treatment and circulation
Re melting process operation, wherein melting, refine and circulation re melting process are all using the preparation of one of Fig. 1 metal semisolid blank
Device.Select AZ91 magnesium alloy as test material in the present embodiment, its liquidus temperature is 597 DEG C, solidus temperature is 473
℃.When preparing the semi-solid blank of magnesium alloy in the present embodiment using the device in Fig. 1, first AZ91 magnesium alloy is placed in earthenware
In crucible 5, it is heated to molten state using first coil 401 and the second coil 402 simultaneously, and at 720 DEG C, metal is melted
Body carries out refining treatment, magnesium alloy metal bath is carried out with follow-up circulation re melting process operation after the completion of refining treatment, and
In the whole process of melting, refine and circulation re melting process, 2%SF is passed through by protective gas import 26+CO2Mixed gas are protected
Shield, to reduce oxidation and the air-breathing of metal bath, carries out real-time monitoring using thermocouple 3 to the temperature of metal bath simultaneously.On
State concretely comprising the following steps of circulation re melting process operation：
Step one, using first coil 401 and the second coil 402 by the magnesium alloy after melting and refine in crucible 5
Metal bath is heated to 640 DEG C, is incubated 15min；
Step 2, reach the temperature of step one after, alternately close first coil 401 and the second coil 402, control metal to melt
The central temperature of body is between the liquid phase of magnesium alloy and solidus temperature gap, that is, between 473-597 DEG C, controls in the present embodiment
Temperature maintains 520 DEG C about all the time；Using hoistable platform 6, crucible 5 is moved up and down with the speed of 0.6m/min, metal is melted
Body carries out solidifying-the circulation re melting process of remelting-solidification, and close first coil 401 when moving up crucible 5 and use second
Coil 402 is heated, and then closes the second coil 402 when moving downward and is heated using first coil 401, and crucible 5
The coboundary that the amplitude moving up just leaves first coil 401 by crucible 5 is defined, and the amplitude that crucible 5 moves down is then
It is defined by the lower boundary that crucible 5 just leaves the second coil 402, the metal bath after heating fusing is in subsequent cooling procedure
In, dendrite can be grown along the direction perpendicular to sidewall of crucible, and these dendrite occur two in subsequent heating reflow process
The fusing of secondary dendritic arm, promotes the increase of free crystal grain, so repeatedly, by the circulation reflow process of solidification-remelting-solidification
The quantity of free crystal grain can be greatly increased, these crystal grain can become the source of semisolid spheric grain；When substantial amounts of free
After grain formation, heating coil can produce Lorentz force to metal bath in the presence of alternating current, in Lorentz force
Under effect, energy ecto-entad pushes, and can order about free crystal grain makes dendrite gradually fuse to melt internal migration, so that
Dendrite in melt can be completely broken, makes the dendrite in gained semi-solid blank be completely reformed into globular crystal；In circulation remelting
Also real time sample detection is carried out to metal bath in processing procedure, when in metal bath dendrite tissue be completely transformed into spherical
When brilliant, stopping is processed, that is, obtain the semi solid slurry of magnesium alloy, and the number of times circulating re melting process in the present embodiment is 6 times；
After the completion of re melting process being circulated to metal bath in step 3, step 2, by the aluminium alloy semi-solid slurry of gained
It is air cooled to room temperature, that is, the semi-solid blank of AZ91 magnesium alloy is obtained.
Comparative example 2
In this comparative example, AZ91 magnesium alloy does not carry out Semi-solid Material Processing, and its preparation technology is：By AZ91 magnesium alloy through with
Directly poured into a mould without circulation re melting process after identical melting and refining treatment in the present embodiment.
Cut the present embodiment gained semi-solid blank and comparative example 2 metallographic specimen without Semi-solid Material Processing sample respectively,
Sample is polished, polish after observe its metallographic structure, its metallographic structure respectively as shown in Fig. 3 (a), Fig. 3 (b), contrast Fig. 3 (a),
Tissue in Fig. 2 (b) as can be seen that can make the AZ91 group of magnesium alloys before Semi-solid Material Processing by using the technical scheme that this is implemented
Dendrite in knitting is completely broken, forms the semi-solid blank being made up of uniform, tiny globular crystal, the effect of Semi-solid Material Processing
The semisolid of the AZ91 magnesium alloy prepared by a kind of preparation method of metal semisolid blank preferably, and by using this implemented
Blank is pure, pollution-free, device therefor structurally and operationally simple, cost is relatively low.
Embodiment 3
A kind of preparation method of metal semisolid blank of the present embodiment, including conventional melting, refining treatment and circulation
Re melting process operation, wherein melting, refine and circulation re melting process are all using the preparation of one of Fig. 1 metal semisolid blank
Device.Select T10 tool steel as test material in the present embodiment, its liquidus temperature is 1480 DEG C, and solidus temperature is
1350℃.When preparing the semi-solid blank of T10 tool steel in the present embodiment using the device in Fig. 1, first by T10 tool steel
It is placed in crucible 5, be heated to molten state using first coil 401 and the second coil 402 simultaneously, and right at 1600 DEG C
Metal bath carries out refining treatment, T10 tool steel metal bath is carried out at follow-up circulation remelting after the completion of refining treatment
Science and engineering sequence, and in the whole process of melting, refine and circulation re melting process, 2%SF is passed through by protective gas import 26+CO2Mixed
Close gas shield, to reduce oxidation and air-breathing of metal bath etc., using thermocouple 3, reality is carried out to the temperature of metal bath simultaneously
When monitoring.The concretely comprising the following steps of above-mentioned circulation re melting process operation：
Step one, simultaneously using first coil 401 and the second coil 402 by the T10 after melting and refine in crucible 5
Tool steel metal bath is heated to 1550 DEG C, is incubated 20min；
Step 2, reach the temperature of step one after, alternately close first coil 401 and the second coil 402, control metal to melt
The central temperature of body is between liquid phase and the solidus temperature gap of T10 tool steel, that is, between 1350-1480 DEG C, the present embodiment
Middle control temperature maintains 1450 DEG C about all the time；Using hoistable platform 6, crucible 5 is moved up and down with the speed of 1m/min, to gold
Belong to melt and carry out solidifying-circulation the re melting process of remelting-solidification, and closing first coil 401 uses when moving up crucible 5
Second coil 402 is heated, and then closes the second coil 402 when moving downward and is heated using first coil 401, and earthenware
The coboundary that the amplitude that crucible 5 moves up just leaves first coil 401 by crucible 5 is defined, and the amplitude that crucible 5 moves down
The lower boundary then just leaving the second coil 402 by crucible 5 is defined, and the metal bath after heating fusing is in subsequent cooling procedure
In, dendrite can be grown along the direction perpendicular to sidewall of crucible, and these dendrite occur two in subsequent heating reflow process
The fusing of secondary dendritic arm, promotes the increase of free crystal grain, so repeatedly, by the circulation reflow process of solidification-remelting-solidification
The quantity of free crystal grain can be greatly increased, these crystal grain can become the source of semisolid spheric grain；When substantial amounts of free
After grain formation, heating coil can produce Lorentz force to metal bath in the presence of alternating current, in Lorentz force
Under effect, energy ecto-entad pushes, and can order about free crystal grain makes dendrite gradually fuse to melt internal migration, so that
Dendrite in melt can be completely broken, makes the dendrite in gained semi-solid blank be completely reformed into globular crystal；In circulation remelting
Also real time sample detection is carried out to metal bath in processing procedure, when in metal bath dendrite tissue be completely transformed into spherical
When brilliant, stopping is processed, that is, obtain the semi solid slurry of T10 tool steel, and the number of times circulating re melting process in the present embodiment is 8 times；
After the completion of re melting process being circulated to metal bath in step 3, step 2, by the T10 tool steel semi solid slurry of gained
Material air-cooled to room temperature, that is, the semi-solid blank of T10 tool steel is obtained.
Comparative example 3
In this comparative example, T10 tool steel does not carry out Semi-solid Material Processing, and its preparation technology is：T10 tool steel is passed through and this
Directly poured into a mould without circulation re melting process after identical melting and refining treatment in embodiment.
Cut the present embodiment gained semi-solid blank and comparative example 3 metallographic specimen without Semi-solid Material Processing sample respectively,
Sample is polished, polish after observe its metallographic structure, its metallographic structure respectively as shown in Fig. 4 (a), Fig. 4 (b), contrast Fig. 4 (a),
Tissue in Fig. 4 (b) is as can be seen that by the technical scheme using the present embodiment, can make the branch in former T10 instrument structure of steel
Crystalline substance is completely broken, forms the globular crystal of fine uniform, to the Semi-solid Material Processing effect of high temperature ferrous materials preferably, solve due to
The higher preparation making its semi-solid blank of ferrous materials fusing point is subject to a difficult problem for restriction significantly.
By embodiment 1-3 can be seen that a kind of metal semisolid blank by using the present invention preparation facilitiess and
The pure pollution-free, even tissue of metal semisolid blank prepared by preparation method is fine and close, device therefor and simple to operate, cost
Relatively low, can be widely applied for preparing various alloy materials, enable in particular to prepare the semi-solid blank of high-melting-point ferrous materials.
Below schematically the present invention and embodiments thereof are described, this description does not have restricted, institute in accompanying drawing
Show is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel enlightened by it, in the case of without departing from the invention objective, designs and this technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (4)
1. a kind of preparation method of metal semisolid blank it is characterised in that：Including conventional melting, refining treatment operation with follow
Ring re melting process operation, wherein, circulation re melting process operation comprises the following steps：
Step one, using metal semisolid blank preparation facilitiess, simultaneously using first coil (401) and the second coil (402)
Sensing heating is carried out to the metal bath after melting and refine in crucible (5), and by METAL HEATING PROCESS to its liquidus temperature
TLBetween above 30-80 DEG C, it is incubated 10-30min；
Step 2, reach the temperature of step one after, alternately close first coil (401) and the second coil (402), control metal molten
The central temperature of body is between the liquid phase of metal alloy compositions and solidus temperature gap, i.e. TL-TSBetween；Using hoistable platform
(6), with the speed of 0.4m/min-1.2m/min cyclically mobile crucible (5) up and down, metal bath is carried out solidify-remelting-and coagulate
Solid circulation re melting process, that is, obtain the semi solid slurry of required metal；Wherein, first is closed when moving up crucible (5)
Coil (401) is heated using the second coil (402), then closes the second coil (402) when moving downward and uses First Line
Circle (401) is heated, and the amplitude that moves up of crucible (5) just leaves the coboundary of first coil (401) with crucible (5)
It is defined, and the lower boundary that the amplitude that crucible (5) moves down then just leaves the second coil (402) by crucible (5) is defined；
After the completion of re melting process being circulated to metal bath in step 3, step 2, the semi solid slurry of gained is cooled to room temperature
The semi-solid blank of metal needed for being formed；
The preparation facilitiess of described metal semisolid blank, including heating arrangements, crucible (5) and hoistable platform (6), wherein, institute
The heating arrangements stated include alternating current power supply (1) and heating coil, and described heating coil passes through wire and alternating current power supply (1) phase
Connect, and above-mentioned heating coil includes first coil (401) and the second coil (402), first coil (401) and the second coil
(402) using being connected in parallel, and first coil (401) is located at the top of the second coil (402)；Described crucible (5) is fixed on
Hoistable platform (6) is upper and is placed in first coil (401) and the second coil (402) inside.
2. a kind of metal semisolid blank according to claim 1 preparation method it is characterised in that：Step 2 is followed
During ring re melting process, metal bath is carried out with real time sample detection, the number of times of re melting process finds sample to sample detection
It is foundation that dendrite tissue is completely transformed into globular crystal.
3. a kind of metal semisolid blank according to claim 1 and 2 preparation method it is characterised in that：In melting, essence
All protective gas is passed through by protective gas import (2), to reduce the oxygen of metal bath during refining and circulation re melting process
Change and air-breathing, described protective gas import (2) is located at crucible (5) top.
4. a kind of metal semisolid blank according to claim 3 preparation method it is characterised in that：To metal alloy
During being circulated re melting process, using thermocouple (3) temperature of metal bath is carried out with real-time monitoring, described thermocouple
(3) it is fixed on the installation in the hole at crucible (5) top, and the induction end of this thermocouple (3) extend into described crucible (5) inside.
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| CN107401922A (en) * | 2017-09-06 | 2017-11-28 | 苏州慧驰轻合金精密成型科技有限公司 | Blank heating device in aluminium alloy semi-solid thixotropic forming |
| CN111876614A (en) * | 2020-09-01 | 2020-11-03 | 南通泰德电子材料科技有限公司 | Non-contact high-frequency heating purification device for high-purity aluminum |
| CN113069971A (en) * | 2021-03-31 | 2021-07-06 | 南方科技大学 | Preparation device and preparation method of metal semi-solid slurry |
| CN113564392A (en) * | 2021-07-23 | 2021-10-29 | 四川大学 | Device and method for refining metal solidification structure by semi-solid variable-temperature vibration |
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| JP3630327B2 (en) * | 2003-07-15 | 2005-03-16 | 俊杓 洪 | Solid-liquid coexistence state metal slurry production equipment |
| CN201225820Y (en) * | 2008-06-26 | 2009-04-22 | 北京有色金属研究总院 | Vertical apparatus for secondarily heating semi-solid-state metal blank |
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