CN104959577B - Simulate the method and founding experimental provision that solidified structure grows under the conditions of big ingot casting slow cooling - Google Patents
Simulate the method and founding experimental provision that solidified structure grows under the conditions of big ingot casting slow cooling Download PDFInfo
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Abstract
The method and founding experimental provision grown the invention discloses solidified structure under the conditions of a kind of big ingot casting slow cooling of simulation, for the process of setting of big ingot casting, the influence that the conditions such as analog study different temperatures gradient, different cooling and different molten steel flow velocitys grow to solidified structure, outfield, the influence that research outfield grows to solidified structure are imported during solidification of metal melt simultaneously.The present invention simulates the process that solidified structure under the conditions of big ingot casting slow cooling grows, the result of simulation and big Casting Ingot Solidification Process direct correlation, pair determines the casting technique of big ingot casting, adjustment relevant device parameter and to improve solidified structure defect significant.
Description
Technical field
The present invention relates to a kind of metal freezing method and experimental provision, and big ingot solidification tissue is simulated more particularly to one kind
Growing method and experimental provision, applied to metal solidification texture growth course thermal simulation technical field and the solidification skill of large-sized casting ingot
Art field.
Background technology
With China's power industry, the rapid development of nuclear industry and petrochemical industry is more next to the demand of heavy casting and forging
It is bigger, while also to the quality requirements more and more higher of heavy casting and forging.For large-sized casting ingot because volume is big, radiation processes are slow, solidification
Process lasts a couple of days, the cooldown rate difference maximum of ingot casting different parts is up to more than 100 times, therefore solidified structure is thick, brilliant
Grain size and the problems such as component distributing is uneven, shrinkage cavity shrinkage porosity it is extremely serious.The performance of final products is not only influenceed, is also often resulted in
Forging crack, heat treatment can not uniformly wait follow-up problem.Strengthen forming core to produce more crystallization nucleis and promote crystal grain to breed
It is the essential measure for reducing these defects.Develop the solidification control method that homogenizes based on internal generation, outfield intensifying propagation, be
Obtain the key of good solidified structure.
At present to the research of large-sized casting ingot process of setting, mainly using following several approach：First, using numerical simulation
Method, the change procedure of flow field of the big ingot casting in process of setting, temperature field and solute field is simulated, adjusts casting mold on this basis
Shape, pouring temperature, the parameter such as pouring type, optimize technique；Second, directly dissect large-scale or ultra-large type ingot casting.Pass through sight
The macrostructure of ingot casting is examined, with reference to the regularity of distribution of the elements such as inside ingot C, S, and the distribution of shrinkage cavity and porosity and field trash
And rule etc. is formed, research influences the principal element of big Casting Ingot Solidification Process, such as thermograde, free convection etc..But dissect
The cost of ingot casting is high, and research cycle is grown, and the process of setting individual difference of large-sized casting ingot is big, and the rule of single ingot casting has one
Fixed limitation；Third, using the forming core and growth course of crystal grain under the conditions of the method simulation slow cooling of numerical simulation, pass through and compare
Different parameters, influence of the different models to analog result, find with truth compared with the model met.
The solidified structures such as the grain size that is formed in the process of setting of metal, the tissue topography of dendrite, solute segregation and casting
The factor such as flowing of thermograde, cooldown rate and melt is relevant in ingot.Relatively small ingot casting, deposit in large-sized casting ingot process of setting
Non-uniform temperature, cooldown rate is slow, melt convection is strong the features such as.Current existing experimental method and equipment can not reappear big casting
Certain difficulty be present in the curing condition inside ingot, therefore, the simulation to big ingot solidification tissue.
Shanghai University《The method of pulse magneto liquid level vibration thinning metal solidification texture》, patent publication No.：
CN201010167538,2010.12.22.The technical operation is convenient, effect side notable to the solidified structure thinning effect of ingot casting
Formula is that lattice coil is acted on to the upper surface of metal bath, is handled for contactless melt, can avoid casting mold to magnetic field
Shielding action.Therefore, pulse magneto liquid level vibration refinement technology is quite suitable for molding the application in industrial production.But early stage
Experimental subjects based on small-sized ingot casting, its setting rate is very fast, and the influence for solidified structure under the conditions of slow cooling lacks depth
The research entered.
Recognize solidified structure and solute Distribution feature under different curing conditions, be to realize the basis that large-sized casting ingot homogenizes.
It is currently the curing conditions such as thermograde, the cooldown rate that big inside ingot has been obtained with the method for numerical simulation, utilizes ingot casting
The method of dissection has obtained partially solidified tissue and solute Distribution situation.Without curing condition and solidified structure, solute point
Cloth combines the process of setting of analysis ingot casting.
The content of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
The method and founding experimental provision that solidified structure grows under the conditions of big ingot casting slow cooling are simulated, by controlling metal bath different directions
Cooldown rate, simulate the thermogrades of different zones in big Casting Ingot Solidification Process, and outfield is introduced by outfield gatherer,
External field treatment is carried out to solidification of metal melt process, the present invention carries to study the growth of the solidified structure of big inside ingot different zones
A kind of new more efficiently research meanses are supplied.
Purpose is created to reach foregoing invention, the present invention uses following technical proposals：
A kind of method simulated solidified structure under the conditions of big ingot casting slow cooling and grown, metal raw is placed in the crucible in body of heater
Material, and crucible is placed in the body of heater final vacuum 10Pa body of heater vacuum environment of temperature-controllable, set 4 in the periphery of crucible
The individual calandria that can control power output respectively, to be heated respectively to 4 sides of crucible and temperature control, specific founding
Process is as follows：
A. in the Metal Melting stage, raw metal is placed in crucible first, then by controlling each calandria simultaneously
Crucible is heated, raw metal is formed metal bath after being heated；
B. in the metal freezing stage, temperature gradient conditions, cooldown rate, pressure are provided for metal solidification texture growth course
Flow field state and any one assistant interventional mechanism in application outfield state or any several assistant interventional composition mechanisms, specifically
For：
1. controlling each calandria to be incubated the not ipsilateral of crucible respectively, it is internally formed in crucible needed for setting
Thermograde, realize the metal solidification texture thermal simulation experiment under customization temperature gradient conditions；
2. in the metal freezing stage, the rate of temperature fall on each surface of control crucible, make the temperature of 4 sides of crucible according to big
The state of temperature of the cooling curve of diverse location is maintained in inside ingot process of setting, the cooling to metal bath in crucible
Speed is respectively controlled, and realizes the metal solidification texture thermal simulation experiment under controllable cooldown rate；
3. in the metal freezing stage, also using the integral level rotary reciprocating motion of body of heater, make to produce inside metal bath
Forced convertion, realize the metal solidification texture thermal simulation experiment under setting flow field condition；
4. during solidification of metal melt, outfield also is applied to metal bath and handled, make to produce inside metal bath
Raw concussion effect, realizes the metal solidification texture thermal simulation experiment under setting condition of external field.The inventive method is coagulated in metal bath
During Gu under the conditions of " having under temperature gradient conditions ", " under Different Cooling Conditions " and " under different molten steel flow velocitys " etc., simultaneously
Import outfield, the influence that research outfield grows to solidified structure.
The present invention simulates the process of solidified structure growth under the conditions of big ingot casting slow cooling, the result of simulation and big ingot solidification mistake
Journey direct correlation, pair determine big ingot casting casting technique, adjustment relevant device parameter and the solidified structure defect that improves have it is important
Meaning.
As currently preferred technical scheme, in the Metal Melting stage and in the metal freezing stage, make raw metal
It is in metal bath in body of heater final vacuum 1Pa thermal environment.
The technical scheme further preferred as the present invention, 1800 DEG C of heating limits temperature；Thermograde in crucible is 0
It is adjustable in the range of ~ 10 DEG C/cm；Calandria temperature-controlled precision is maintained within ± 0.5 DEG C；Between 1600 ~ 1200 DEG C, crucible surface
Cooldown rate it is controllable in the range of 0 ~ 10 DEG C/min；The body of heater speed of rotation is 0 ~ 30 rev/min adjustable.
As the further preferred technical scheme of such scheme of the present invention, according to 4 not less than 10Hz frequencies to crucible
The temperature data of side is acquired.
The founding experimental provision for the method that solidified structure grows, main under the conditions of a kind of big ingot casting slow cooling of implementation present invention simulation
To be made up of heating and atmosphere protection system, temperature control and temperature acquisition system and central controller, heating and atmosphere protection system
The main crucible and graphite protective sleeve for including being arranged in the vacuum furnace shell of sealing, graphite protective sleeve are enclosed on the outside of crucible,
Corundum fine sand is tamped between graphite protective sleeve and crucible, raw metal is placed in crucible, and temperature control and temperature acquisition system are by one
Serial temperature thermocouple and temperature data collecting system and temperature controller composition, temperature data collecting system and temperature controller all with center
Controller signals connect, and in vacuum furnace shell, 4 sides of graphite protective sleeve face one group of graphite heating body, each graphite respectively
The operating current of calandria is independently controlled by temperature controller, and each temperature thermocouple is arranged in each graphite heating body and earthenware
Between crucible, in the clearance space between vacuum furnace shell and graphite protective sleeve, between every group of adjacent graphite heating body with every
Hot plate separates, and forms a series of independent heating chambers respectively, and the temperature in each heating chamber is respectively by corresponding independent one group
Graphite heating body is controlled, and the bottom surface and top surface between each heating chamber are closed by heat insulation felt, by central controller according to big casting
The cooling curve of diverse location carrys out temperature control in ingot process of setting, sets corresponding temperature gradient in crucible in different directions, realizes
The metal solidification texture thermal simulation experiment under temperature gradient conditions is customized, central controller adjusts each graphite by temperature controller respectively
The power output of heater, the rate of temperature fall on each surface of control crucible, realize the metal solidification texture heat under setting condition of external field
Simulated experiment, raw metal are in vacuum 10Pa thermal environment with crucible, provided with body of heater rotary system, body of heater rotation
System is made up of the swivel base and power set being arranged at outside vacuum furnace shell below body of heater, is moved by central controller controls
Power apparatus drives swivel base to drive whole body of heater crankmotion, the metal bath in crucible is internally formed pressure pair
Stream, the metal solidification texture thermal simulation experiment under setting flow field condition is realized, provided with outfield gatherer, imported and filled using outfield
The metal bath put into crucible imports outfield, by central controller controls outfield gatherer, makes solidification of metal melt mistake
Journey is under the outer field action of customization and carried out, and realizes the metal solidification texture thermal simulation experiment under setting condition of external field.
As currently preferred technical scheme, the importing coil of outfield gatherer is arranged inside vacuum furnace shell, is led
Enter coil in furnace interior controllable lift, and to import coil configuration cooling system.
The technical scheme further preferred as the present invention, the cooling system for importing coil is water-cooling system, makes lead-in wire
Water flowing is cooled down in circle, and cooling water flow is adjusted according to the height of pipe outer wall temperature.
As the further preferred technical scheme of such scheme of the present invention, heat insulation felt is carbon felt.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage：
1. the process of setting of big ingot casting is a complicated process, the growth course of solidified structure is both by temperature field, flow field
Influence, the formation for the defects of affecting big ingot casting shrinkage cavity and porosity and gross segregation again, the present invention can simulate big ingot solidification
Tissue growth process, as a result directly it is associated with the solidified structure of ingot casting, the process of setting to controlling big ingot casting, improves big ingot casting
Solidified structure, it is significant to realize that large-sized casting ingot composition homogenizes；
2. the present invention by changing cooling condition, reproduce in big Casting Ingot Solidification Process the thermograde of different zones and
Cooldown rate, the growth course of big inside ingot different zones solidified structure is studied, be that development is based on internal generation, outfield intensifying
The solidification control method that homogenizes of propagation, realizes that homogenizing for large-sized casting ingot provides foundation and reference.
Brief description of the drawings
Fig. 1 is the founding experimental provision schematic diagram that the preferred embodiment of the present invention simulates big ingot solidification tissue growth.
Fig. 2 be along Fig. 1 in A-A directions sectional view.
Fig. 3 is the big ingot casting sample sampling core position view prepared in a preferred embodiment of the invention.
Fig. 4 be along Fig. 3 in B-B directions sectional view.
Fig. 5 is the thermal simulation temperature control curve map that the preferred embodiment of the present invention uses.
Fig. 6 is that the big ingot casting center of the preferred embodiment of the present invention is shone without the thermal simulation ingot casting central section under temperature gradient conditions
Piece.
Fig. 7 is thermal simulation ingot casting edge cross-section photographs of the big ingot casting of the preferred embodiment of the present invention close to ingot casting edge.
Embodiment
Details are as follows for the preferred embodiments of the present invention：
In the present embodiment, referring to Fig. 1 ~ Fig. 7, solidified structure growing method is molten under the conditions of a kind of big ingot casting slow cooling of simulation
Experimental provision is cast, is mainly controlled by heating and atmosphere protection system, temperature control and temperature acquisition system, body of heater rotary system and center
Device composition, heating and atmosphere protection system mainly include the crucible 7 and graphite protective sleeve 3 being arranged in the vacuum furnace shell 1 of sealing,
Graphite protective sleeve 3 is enclosed on the outside of crucible 7, and corundum fine sand 8 is tamped between graphite protective sleeve 3 and crucible 7, and raw metal is placed
In crucible 7, temperature control and temperature acquisition system are by a series of temperature thermocouples 6 and temperature data collecting system 4 and temperature controller group
Into, temperature data collecting system 4 and temperature controller are all connected with central controller signal, in vacuum furnace shell 1, graphite protective sleeve 3
4 sides face one group of graphite heating body 2 respectively, the operating current of each graphite heating body 2 carries out independent control by temperature controller
System, each temperature thermocouple 6 is arranged between each graphite heating body 2 and crucible 7, vacuum furnace shell 1 and graphite protective sleeve 3 it
Between clearance space in, separated, formed respectively a series of independent with thermal insulation board 12 between every group of adjacent graphite heating body 2
Heating chamber 11, the temperature in each heating chamber 11 are controlled by corresponding one group of independent graphite heating body 2 respectively, each heating chamber 11
Between bottom surface and top surface by heat insulation felt 5 close to prevent lose heat, heat insulation felt 5 is carbon felt, by central controller according to
The cooling curve of diverse location carrys out temperature control in big Casting Ingot Solidification Process, sets corresponding temperature gradient in crucible 7 in different directions,
The metal solidification texture thermal simulation experiment under customization temperature gradient conditions is realized, central controller is adjusted respectively respectively by temperature controller
The power output of graphite heater 2, the rate of temperature fall on 7 each surface of control crucible, realize the metal freezing under setting condition of external field
Thermal simulation experiment is organized, raw metal is in crucible 7 in the thermal environment that vacuum is 10Pa, rotates system provided with body of heater
System, body of heater rotary system is made up of the swivel base 10 and power set being arranged at below the outside body of heater of vacuum furnace shell 1, in
Centre controller controls power set to drive swivel base 10 to drive whole body of heater crankmotion, makes the metal in crucible 7
Melt is internally formed forced convertion, realizes the metal solidification texture thermal simulation experiment under setting flow field condition, body of heater rotary system
It is made up of motor, machine driven system and spacing part, under three phase alternating current motor driving, is driven entirely by swivel base 10
Body of heater crankmotion, makes molten steel be internally formed forced convertion, provided with outfield gatherer 9, using outfield gatherer 9 to
Metal bath in crucible 7 imports outfield, by central controller controls outfield gatherer 9, makes solidification of metal melt process
Carried out under outer field action in customization, realize the metal solidification texture thermal simulation experiment under setting condition of external field, outfield imports
The importing coil of device 9 is arranged inside vacuum furnace shell 1, imports coil in furnace interior controllable lift, during to prevent work because
Hyperthermia radiation causes to fail, and to importing coil configuration cooling system, the cooling system for importing coil is water-cooling system, makes lead-in wire
Water flowing is cooled down in circle, and cooling water flow is adjusted according to the height of pipe outer wall temperature.
In the present embodiment, referring to Fig. 1 ~ Fig. 7, the experiment dress that solidified structure grows under the conditions of a kind of big ingot casting slow cooling of simulation
Put, it is main to include by heating and atmosphere protection system, temperature control and temperature acquisition system, body of heater rotary system and outfield introgressive line
System four systemses, the equipment specific implementation method are as follows：
A., raw metal is made to the block of suitable size, after acid pickling and rust removing, is put into the crucible 7 of cuboid, crucible 7
Interior chamber size be long 150mm, wide 100mm, high 230mm, once experiment raw metal about 20Kg, to prevent crucible 7 from adding
Ruptured when hot, be cased with a graphite protective sleeve 3 outside crucible 7, filled out among crucible 7 and graphite protective sleeve 3 with high-purity corundum fine sand 8
It is real, whole furnace chamber is divided into four heating chambers 11 with thermal insulation board, the top and bottom of each heating chamber 11 are closed with carbon felt, gold
Belong to raw material and cuboid crucible 7 in the vacuum environment that vacuum is 10Pa；
B., the power output of graphite heater 2 is set, and temperature acquisition system be able to will add according to 10Hz frequency collection data
Atmosphere temperature is heated to 1550 DEG C in hot stove, is incubated 120 minutes, is completely melt raw metal；
C. according to the different sampling regions of the big inside ingot simulated in Fig. 3 and Fig. 4, set according to the temperature curve in Fig. 5
The cooling process of fixed each graphite heater 2, controls the cooling velocity of the different faces of crucible 7, makes the metal bath in crucible 7 in difference
Thermograde under solidify；
D. continue to cool according to setting curve, until being down to room temperature, completely after cooling, open vent valve, open bell, will
Sample takes out, and after pre-grinding, polishing, is soaked 30 minutes at a temperature of 80 DEG C with 50% hydrochloric acid solution, is used rapidly after taking-up
Absolute alcohol cleans surface, observes simultaneously statistical experiment result, as shown in Figure 6 and Figure 7, the structure refinement of ingot casting center and peripheral,
Crystal grain is uniform.
Raw metal is placed in crucible 7 by the present embodiment, and raw metal is in the vacuum environment being well incubated with crucible 7
In.Four side temperature of crucible 7 by face of four independent graphite heating bodies 2 control.Graphite heating body 2 heats jointly
The raw metal in crucible 7 is set to be completely melt into metal bath.Four sides of crucible 7 according in big Casting Ingot Solidification Process not
Cooling curve with position carrys out temperature control, it is possible thereby to be internally formed thermograde in crucible 7.By adjusting graphite heating body 2
Power output, different cooldown rates is formed at the both ends of crucible 7.It is rotated in using the integral level of body of heater inside metal bath
Caused forced convertion.Furthermore it is possible to outfield gatherer 9 is placed in the top of metal bath, to solidification of metal melt process
Carry out external field treatment.
The present embodiment realizes the solidified structure thermal simulation under temperature gradient conditions, according to big Casting Ingot Solidification Process temperature
The numerical result of field, by adjusting the power output of graphite heater 2, the rate of temperature fall on 7 each surface of control crucible, in earthenware
Thermograde is formed in metal bath in crucible 7, is easy to study the influence that thermograde grows solidified structure；The present embodiment pin
To the characteristics of cooldown rate difference is big between ingot casting regional in large-sized casting ingot process of setting, control graphite heating body 2 is not with
Same rate cools, and realizes the solidified structure thermal simulation under different cooling rate；The present embodiment is rotated using the integral level of body of heater
Influence of the forced convertion to solidified structure is studied, is rotated in by body of heater integral level in molten steel and produces forced convertion, simulates steel
Influence of the liquid convection current to solidified structure；The present embodiment imports outfield using outfield gatherer 9 in solidification of metal melt process, grinds
Study carefully the influence that outfield grows to big Casting Ingot Solidification Process.
The embodiment of the present invention is illustrated above in conjunction with accompanying drawing, but the invention is not restricted to above-described embodiment, can be with
A variety of changes are made according to the purpose of the innovation and creation of the present invention, under all Spirit Essence and principle according to technical solution of the present invention
Change, modification, replacement, combination, the simplification made, should be equivalent substitute mode, as long as meeting the goal of the invention of the present invention, only
Otherwise the method and the technical principle of founding experimental provision that solidified structure grows under the conditions of the big ingot casting slow cooling of present invention simulation
And inventive concept, belong to protection scope of the present invention.
Claims (8)
1. a kind of method that solidified structure grows under the conditions of big ingot casting slow cooling of simulation, it is characterised in that in the crucible in body of heater
Raw metal is placed, and crucible is placed in the body of heater final vacuum 10Pa body of heater vacuum environment of temperature-controllable, in crucible
Periphery 4 calandrias that can control power output respectively are set, to be heated respectively to 4 sides of crucible and temperature control
System, specific fusion-casting process are as follows：
A. in the Metal Melting stage, raw metal is placed in crucible first, then by controlling each calandria simultaneously to earthenware
Crucible is heated, and raw metal is formed metal bath after being heated；
B. in the metal freezing stage, temperature gradient conditions, cooldown rate is provided for metal solidification texture growth course, forces flow field
State and the combination for applying any one assistant interventional mechanism or any several assistant interventional mechanism in the state of outfield, it is each described
Assistant interventional mechanism is as follows：
1. controlling each calandria to be incubated the not ipsilateral of crucible respectively, the required temperature ladder of setting is internally formed in crucible
Degree, realize the metal solidification texture thermal simulation experiment under customization temperature gradient conditions；
2. in the metal freezing stage, the rate of temperature fall on each surface of control crucible, make 4 side temperature of crucible according in big ingot casting
The state of temperature of the cooling curve of diverse location is maintained in portion's process of setting, to the metal bath of diverse location in crucible
Cooldown rate is respectively controlled, and realizes the metal solidification texture thermal simulation experiment under controllable cooldown rate；
3. in the metal freezing stage, also using the integral level rotary reciprocating motion of body of heater, make to produce pressure inside metal bath
Convection current, realize the metal solidification texture thermal simulation experiment under setting flow field condition；
4. during solidification of metal melt, outfield also is applied to metal bath and handled, makes to produce shake inside metal bath
The effect of swinging, realize the metal solidification texture thermal simulation experiment under setting condition of external field.
2. the method that solidified structure grows under the conditions of big ingot casting slow cooling is simulated according to claim 1, it is characterised in that：In gold
Belong to smelt stage and in the metal freezing stage, raw metal and metal bath is in body of heater final vacuum 10Pa guarantor
In warm environment.
3. the method that solidified structure grows under the conditions of the big ingot casting slow cooling of simulation according to claim 1 or claim 2, it is characterised in that：
1800 DEG C of heating limits temperature；Thermograde in crucible is adjustable in the range of 0~10 DEG C/cm；Calandria temperature-controlled precision is kept
Within ± 0.5 DEG C；Between 1600~1200 DEG C, the cooldown rate of crucible surface is controllable in the range of 0~10 DEG C/min；Stove
The body speed of rotation is 0~30 rev/min adjustable.
4. the method that solidified structure grows under the conditions of the big ingot casting slow cooling of simulation according to claim 1 or claim 2, it is characterised in that：
The temperature data of 4 sides of crucible is acquired according to the data acquiring frequency not less than 10Hz.
5. the founding experiment dress for the method that solidified structure grows under the conditions of the big ingot casting slow cooling of simulation described in a kind of implementation claim 1
Put, be mainly made up of heating and atmosphere protection system, temperature control and temperature acquisition system and central controller, the heating and atmosphere
Protection system mainly includes the crucible (7) and graphite protective sleeve (3) being arranged in the vacuum furnace shell (1) of sealing, and the graphite is protected
Sheath (3) is enclosed on the outside of the crucible (7), and corundum fine sand is tamped between the graphite protective sleeve (3) and the crucible (7)
(8), it is inner to be placed on the crucible (7) for raw metal, the temperature control and temperature acquisition system by a series of temperature thermocouples (6) and
Temperature data collecting system (4) and temperature controller composition, the temperature data collecting system (4) and the temperature controller all with it is described in
Entreat controller signals connection, it is characterised in that：In the vacuum furnace shell (1), 4 sides point of the graphite protective sleeve (3)
Not Mian Dui one group of graphite heating body (2), the operating current of each graphite heating body (2) carries out independent control by the temperature controller
System, each temperature thermocouple (6) are arranged between each graphite heating body (2) and the crucible (7), described true
In clearance space between empty furnace shell (1) and the graphite protective sleeve (3), between graphite heating body (2) described in adjacent every group
Separated with thermal insulation board (12), form a series of independent heating chambers (11) respectively, the temperature in each heating chamber (11)
Graphite heating body (2) control as described in corresponding independent one group respectively, bottom surface and top surface between each heating chamber (11)
By heat insulation felt (5) close, by the central controller according to the cooling curve of diverse location in big Casting Ingot Solidification Process come
Temperature control, the interior corresponding temperature gradient of the crucible (7) is set in different directions, realizes that the metal under customization temperature gradient conditions coagulates
Gu tissue thermal simulation experiment, the central controller adjusts the output work of each graphite heater (2) by temperature controller respectively
Rate, the rate of temperature fall on the crucible (7) each surface is controlled, realize that the metal solidification texture thermal simulation under controllable cooldown rate is real
To test, raw metal is in vacuum 10Pa thermal environment with the crucible (7), provided with body of heater rotary system, the stove
Body rotary system is made up of the swivel base (10) and power set being arranged at below the outside body of heater of vacuum furnace shell (1), passes through institute
Power set described in central controller controls are stated to drive the swivel base (10) to drive whole body of heater crankmotion, are made
Metal bath in the crucible (7) is internally formed forced convertion, realizes the metal solidification texture hot-die under setting flow field condition
Draft experiment, provided with outfield gatherer (9), led using metal bath of the outfield gatherer (9) into the crucible (7)
Enter outfield, by outfield gatherer (9) described in the central controller controls, solidification of metal melt process is in customization
Carried out under outer field action, realize the metal solidification texture thermal simulation experiment under setting condition of external field.
6. founding experimental provision according to claim 5, it is characterised in that：The importing coil of the outfield gatherer (9)
It is internal to be arranged at the vacuum furnace shell (1), the importing coil is cold for the importing coil configuration in furnace interior controllable lift
But system.
7. founding experimental provision according to claim 6, it is characterised in that：The cooling system for importing coil is water cooling system
System, makes water flowing cooling in the importing coil, and cooling water flow is adjusted according to the height of pipe outer wall temperature.
8. the founding experimental provision according to any one in claim 5~7, it is characterised in that：The heat insulation felt (5) is carbon
Felt.
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| CN104226952A (en) * | 2014-01-02 | 2014-12-24 | 上海大学 | Metal solidification process simulation method |
| CN203972826U (en) * | 2014-04-02 | 2014-12-03 | 上海大学 | A kind of liquid surface fluctuation device |
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