CN114535561A - Real-time automatic regulation and control method and device for alloy mushy zone in wide solidification zone through directional solidification of traveling wave magnetic field - Google Patents
Real-time automatic regulation and control method and device for alloy mushy zone in wide solidification zone through directional solidification of traveling wave magnetic field Download PDFInfo
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- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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Abstract
A method and a device for automatically regulating and controlling an alloy mushy zone in a wide solidification zone in real time in a traveling wave magnetic field directional solidification process relate to a method and a device for automatically regulating and controlling the mushy zone in the traveling wave magnetic field directional solidification process. The invention aims to solve the problem that the solidification process, the structure and the performance cannot be stably controlled in the existing directional solidification process of the alloy traveling wave magnetic field in the wide solidification zone. The invention calculates and calculates the liquidus temperature T of the alloy by utilizing the alloy phase diagram aiming at alloy materials with different wide solidification intervalsLAnd solidus temperature TSAnd obtaining a temperature interval of the mushy zone; determining the temperature gradient and thus the temperature interval of the mushy zone on the basis of the constant cooling speed and the initial withdrawal speedThe total length is divided equally, the divided area is detected according to the temperature of the divided area and based on TL、TSThe relation (3) is that directional solidification is carried out by utilizing a traveling wave magnetic field. The method is mainly used for automatically regulating and controlling the mushy zone in the alloy solidification process.
Description
Technical Field
The invention relates to a method and a device for automatically regulating and controlling a mushy zone in a traveling wave magnetic field directional solidification process.
Background
At present, a constant drawing speed is generally adopted for material preparation in the directional solidification process of the alloy, certain change of the position of a mushy zone along with the continuous downward drawing process of a sample is not considered, and a better method and a better counter measure are not adopted aiming at the change of the mushy zone, so that when the directional solidification method is used for preparing the alloy in a wide solidification interval, more uncontrollable variables are generated in the solidification process, and the experimental result is influenced.
At present, the traveling wave magnetic field directional solidification technology can be used for generating melt flowing, feeding and stirring effects on the alloy in a wide solidification interval in the solidification process, so that the alloy structure and the performance are influenced. However, in the process of applying the traveling wave magnetic field, the temperature field in the alloy mushy zone is inevitably distributed unevenly and the position of the temperature field is changed greatly, which finally causes the phenomenon that the alloy structure and the performance are different from the predicted result under the action of the traveling wave magnetic field, so that the material preparation by the traveling wave magnetic field directional solidification technology becomes uncontrollable, and the automatic, digital and intelligent control of the solidification process, the structure and the performance of the alloy in the wide solidification zone in the solidification process cannot be realized.
In summary, aiming at the problems that the mushy zone of the alloy in the wide solidification interval is uncontrollable in the directional solidification process of the traveling wave magnetic field and the solidification process, the structure and the performance are unstable, a brand-new real-time automatic mushy zone regulation and control technology is needed to be provided to ensure that the position of the mushy zone is always in the optimal action area of the magnetic field and the overall stability of the temperature field of the mushy zone, so that the automatic, digital and intelligent control on the solidification process, the structure and the performance is realized.
Disclosure of Invention
The invention aims to solve the problem that the position and the temperature field of an alloy mushy zone can not be effectively controlled in the directional solidification process of the existing alloy traveling wave magnetic field in a wide solidification zone, so that the solidification process, the structure and the performance can not be stably controlled. Further provides a real-time automatic regulation and control method for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone.
The real-time automatic regulation and control method for the alloy mushy zone in the wide solidification interval by directional solidification in the traveling wave magnetic field comprises the following steps:
s1, calculating the liquidus temperature T of the alloy by utilizing the alloy phase diagram according to different wide solidification interval alloy materialsLSolidus temperature TSAnd obtaining a temperature interval delta T of the mushy zone;
s2, determining the constant cooling speed v according to actual experiment or production needsc；
S3, determining the initial drawing speed v according to actual experiment or production requirementsg；
S4, according to the constant cooling speed and the initial drawing speed, passing the formula GT＝vc/vgDetermining the temperature gradient GT，
S5, passing through L according to the temperature interval and the temperature gradient of the mushy zoneΔT＝ΔT/GTDetermining the total length L of the temperature interval of the mushy zoneΔT；
S6, setting the total length L in the optimal action area of the traveling wave magnetic field generatorΔTEvenly dividing N-1 into N equal parts, setting N temperature measuring points, wherein N is more than or equal to 3, and sequentially representing the measured temperature as T from the top to the bottom of the alloy1、T2、……、TN；
S7, and the heating temperature of the top of the alloy in the process of solidification is expressed as TABottom temperature is denoted TB；
The T isA＞TLSaid T isB＜TS；
S8 temperature T1、T2、……、TNAnd TA、TBReal-time monitoring based on TL、TSAnd T1、T2、……、TNThe relation of (1), directional solidification is carried out by utilizing a traveling wave magnetic field;
simultaneously monitoring the total length h of the residual melt of the alloy material, and when h is more than or equal to LΔTWhen the directional solidification is continued, when h<LΔTWhen the temperature is not regulated, the residual melt is free to be cooled and solidified.
Preferably, N is 5.
Further, the base is TL、TSAnd T1、T2、……、TNThe process of directional solidification by using the traveling wave magnetic field comprises the following steps:
(1) setting the heating temperature T of the top of the alloyABottom temperature TB；
(2) Determining whether the traveling wave magnetic field is opened, if so, performing the step (3), otherwise, performing the step (4);
(3) determining whether the mushy zone is in the optimal action area of the magnetic field, if so, performing the step (4), otherwise, performing the step (5);
(4) setting an initial drawing speed vgInitial cooling velocity vc(ii) a Then executing the step (8);
(5) determining whether the mushy zone is higher than the optimal action area of the magnetic field, if so, performing the step (6), otherwise, performing the step (7);
(6) setting an initial drawing speed vgV initial cooling velocity vc(ii) a Then returning to the step (3);
wherein Δ v is the drawing speed variation;
(7) setting an initial drawing speed vgΔ v, initial cooling velocity vc(ii) a Then returning to the step (3);
(8) and determining TLWhether or not T is greater than or equal to1Such asIf yes, executing step (9); otherwise, executing the step (10);
(9) and determining T5Whether or not T is greater than or equal toSIf yes, executing step (14); otherwise, executing step (15);
(10) and determining TLWhether or not T is greater than or equal to5If yes, executing step (11); otherwise stop vgIncrease vcDecrease TA、TBAnd continue to judge TLWhether or not T is greater than or equal to5；
(11) And determining TLWhether or not T is greater than or equal to4If yes, executing step (12); otherwise stop vgIncrease vcDecrease TAAnd continue to judge TLWhether or not T is greater than or equal to4；
(12) And determining TLWhether or not T is greater than or equal to3If yes, executing step (13); otherwise stop vgIncrease vcAnd continue to judge TLWhether or not T is greater than or equal to3；
(13) And determining TLWhether or not T is greater than or equal to2If it is decreasing vgAnd returning to the step (8); otherwise reduce vgIncrease vcAnd continue to judge TLWhether or not T is greater than or equal to2；
(14) Continuously maintaining TA、TB、vg、vcDecreasing, executing step (19);
(15) and determining TSWhether or not T is greater than or equal to1If yes, executing step (16); otherwise stop vgStop vcIncrease TA、TBAnd continue to judge TSWhether or not T is greater than or equal to1；
(16) And determining TSWhether or not T is greater than or equal to2If yes, executing step (17); otherwise increase vgStop vcIncrease TAAnd continue to judge TSWhether or not T is greater than or equal to2；
(17) And determining TSWhether or not T is greater than or equal to3If yes, executing step (18); otherwise increase vgStop vcAnd continue to judge TSWhether or not T is greater than or equal to3；
(18) And determining TSWhether or not T is greater than or equal to4If v is increasedgAnd returning to the step (9); otherwise increase vgDecrease vcAnd continue to judge TSWhether or not T is greater than or equal to4；
(19) H is judged to be more than or equal to LΔTAnd if yes, returning to the step (8), otherwise, ending.
The device is a storage medium, at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to realize the real-time automatic regulation and control method of the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone.
The device comprises a processor and a memory, wherein at least one instruction is stored in the memory, and the at least one instruction is loaded and executed by the processor to realize the real-time automatic regulation and control method of the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone.
Has the advantages that:
the invention can realize real-time feedback and transmission of multi-temperature signals, operation of a signal operation system on the received signals, and real-time regulation and control of the drawing speed by a drawing speed regulation and control system according to the operation result, thereby realizing stable maintenance of the position of the mushy zone, real-time and stable regulation and control of the whole temperature field in the mushy zone, further realizing the stable control of a traveling wave magnetic field on the alloy solidification process, and improving the solidification structure and performance.
Drawings
FIG. 1 is a diagram showing the effect of mushy zone during directional solidification without a traveling wave magnetic field and during directional solidification with a traveling wave magnetic field applied;
FIG. 2 is a schematic diagram of a temperature measurement location and associated parameter settings;
FIG. 3 is a technical flow chart of real-time temperature monitoring, feedback, calculation and real-time pull speed adjustment.
Detailed Description
In the existing related researches, the related problems such as certain change and the like are not noticed and found along with the continuous downward drawing of the sample to the position of the mushy zone. However, through the research and repeated experiments of the invention, the following results are found: during the directional solidification process without the traveling wave magnetic field, a concave interface appears in the mushy zone, and the concave interface becomes more and more serious along with the solidification process, so that the temperature distribution in the mushy zone is uneven, and the stability of the solidification behavior is influenced. However, no related technology can detect and automatically regulate the temperature distribution of the mushy zone in real time at present. Secondly, in the directional solidification process of applying the traveling wave magnetic field, the mushy zone can fluctuate at any time under the action of the magnetic field force, so that the temperature of the mushy zone is difficult to regulate and control, and no related technology can effectively carry out real-time detection and automatic regulation and control on the temperature distribution of the mushy zone at present. The mushy zone during directional solidification without traveling wave magnetic field and directional solidification with traveling wave magnetic field is shown in FIG. 1.
Therefore, the invention aims to solve the problems that the effective controllability of the position and the temperature field of an alloy mushy zone cannot be met in the existing wide-solidification-interval alloy traveling wave magnetic field directional solidification process, and the stable control of the solidification process, the structure and the performance is realized, and provides the real-time automatic regulation and control method for the traveling wave magnetic field directional solidification wide-solidification-interval alloy mushy zone. The invention discloses a real-time automatic regulation and control method for a traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone, which mainly comprises the steps of carrying out multi-measurement position real-time monitoring on a mushy zone temperature field by a temperature monitoring system, carrying out real-time feedback and transmission on multi-temperature signals by a signal feedback system, carrying out operation on the received signals by a signal operation system, and carrying out real-time regulation and control on the drawing speed by a drawing speed regulation and control system according to an operation result, thereby realizing the stable maintenance of the mushy zone position and the real-time regulation and control of the whole temperature field in the mushy zone.
The first embodiment is as follows:
the real-time automatic regulation and control method for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone comprises the following steps:
s1, calculating the liquidus temperature T of the alloy by utilizing the alloy phase diagram according to different wide solidification interval alloy materialsLSolidus temperature TSAnd obtaining a mushy zone temperature interval (solid-liquid phase temperature difference) delta T;
s2, determining the constant cooling speed v according to actual experiment or production needsc；
S3, determining the initial drawing speed v according to actual experiment or production requirementsg；
S4, according to the constant cooling speed and the initial drawing speed, passing the formula GT＝vc/vgDetermining the temperature gradient GT，
S5, according to the temperature interval and the temperature gradient of the mushy zone, by a formula LΔT＝ΔT/GTDetermining the total length L of the temperature interval of the mushy zoneΔT；
S6, setting the total length L in the optimal action area of the traveling wave magnetic field generatorΔTThe five temperature measuring points are divided equally, and the measured temperatures from top to bottom are respectively expressed as T1、T2、T3、T4、T5As shown in fig. 2;
actually, the temperature monitoring point is based on the actually measured total length L of the mushy zone lengthΔTSet up a plurality ofly as far as, the temperature monitoring point is more, and feedback signal is more meticulous, and regulation and control is more accurate, and specific quantity is confirmed according to actual conditions, requires that the monitoring point can not be less than 3.
S7, and the heating temperature of the top of the alloy in the process of solidification is expressed as TABottom temperature is denoted TB；
In the initial state of directional solidification, TAIs the temperature at which the alloy melt is heated, thus TA＞TL；TBIs the temperature at which the bottom of the alloy is cooled, thereby achieving a bottom-up directional solidification process, thus TB＜TS。
S8, directional solidification is carried out by utilizing a traveling wave magnetic field; the total length of the remaining melt of the monitored alloy material is denoted as h;
alloy (I)The total length h of the residual melt is continuously reduced in the process of the material along with the directional solidification, and when h is more than or equal to LΔTWhen h is reached, the operation is continued<LΔTAnd (3) no longer regulating the temperature, and freely cooling and solidifying the residual melt.
When the directional solidification of the traveling wave magnetic field starts, a temperature monitoring system, a signal feedback system, a signal operation system and a drawing speed regulation system are started; the temperature T is realized by adopting a technical flow chart as shown in figure 31、T2、……、TNAnd TA、TBThe method can be used for monitoring, feeding back, calculating and regulating the drawing speed in real time, and finally, the automatic, digital and intelligent preparation of the alloy in the wide solidification interval can be completed.
The process of real-time monitoring, feedback and operation of temperature and real-time regulation and control of drawing speed comprises the following steps:
(1) setting the heating temperature T of the top of the alloyABottom temperature TB；
(2) Determining whether the traveling wave magnetic field is opened, if so, performing the step (3), otherwise, performing the step (4);
(3) determining whether the mushy zone is in the optimal action area of the magnetic field, if so, performing the step (4), otherwise, performing the step (5);
(4) setting an initial drawing speed vgInitial cooling velocity vc(ii) a Then executing the step (8);
(5) determining whether the mushy zone is higher than the optimal action area of the magnetic field, if so, performing the step (6), otherwise, performing the step (7);
(6) setting an initial drawing speed vgV initial cooling velocity vc(ii) a Then returning to the step (3);
(7) setting an initial drawing speed vgΔ v, initial cooling velocity vc(ii) a Then returning to the step (3);
(8) and determining TLWhether or not T is greater than or equal to1If yes, executing step (9); otherwise, executing the step (10);
(9) and determining T5Whether or not T is greater than or equal toSIf yes, executing step (14); otherwise, executing step (15);
(10) and determining TLWhether or not T is greater than or equal to5If yes, executing step (11); otherwise stop vgIncrease vcDecrease TA、TBAnd continue to judge TLWhether or not T is greater than or equal to5；
(11) And determining TLWhether or not T is greater than or equal to4If yes, executing step (12); otherwise stop vgIncrease vcDecrease TAAnd continue to judge TLWhether or not T is greater than or equal to4；
(12) And determining TLWhether or not T is greater than or equal to3If yes, executing step (13); otherwise stop vgIncrease vcAnd continue to judge TLWhether or not it is greater than or equal to T3；
(13) And determining TLWhether or not T is greater than or equal to2If it is decreasing vgAnd returning to the step (8); otherwise reduce vgIncrease vcAnd continue to judge TLWhether or not T is greater than or equal to2；
(14) Continuously maintaining TA、TB、vg、vcDecreasing, executing step (19);
(15) and determining TSWhether or not T is greater than or equal to1If yes, executing step (16); otherwise stop vgStop vcIncrease TA、TBAnd continue to judge TSWhether or not T is greater than or equal to1；
(16) And determining TSWhether or not T is greater than or equal to2If yes, executing step (17); otherwise increase vgStop vcIncrease TAAnd continue to judge TSWhether or not T is greater than or equal to2；
(17) And determining TSWhether or not T is greater than or equal to3If yes, executing step (18); otherwise increase vgStop vcAnd continue to judge TSWhether or not T is greater than or equal to3；
(18) Judgment ofBroken TSWhether or not T is greater than or equal to4If v is increasedgAnd returning to the step (9); otherwise increase vgDecrease vcAnd continue to judge TSWhether or not T is greater than or equal to4；
(19) H is judged to be more than or equal to LΔTAnd if yes, returning to the step (8), otherwise, ending.
Examples
The first embodiment is as follows: al-5Cu wide solidification range alloy is used as a material, and the directional solidification technology of the traveling wave magnetic field is used for preparation at a lower cooling speed.
1) Calculating the liquidus temperature T of the alloy by utilizing an alloy phase diagram aiming at the Al-5Cu alloy materialLAt 648 ℃ and a solidus temperature TSIs 548 ℃, and the temperature interval (solid-liquid phase temperature difference) Delta T of the mushy zone is 100 ℃;
2) determining the constant cooling speed v according to actual experiment or production requirementsc＝0.3℃/s；
3) Determining the initial drawing speed v according to the actual experiment or production requirementsg＝0.2mm/s；
4) According to the constant cooling speed and the initial drawing speed, the formula G is adoptedT＝vc/vgDetermining the temperature gradient GT＝1.5℃/mm，
5) Determining the total length L of the temperature interval according to the temperature interval and the temperature gradientΔT＝66.7mm；
6) Setting total length L in optimal action area of traveling wave magnetic field generatorΔTAnd the measured temperatures of the five temperature measuring points which are equally spaced from each other from top to bottom are respectively represented as T1、T2、T3、T4、T5；
7) The heating temperature of the top of the alloy during solidification is denoted as TA750 ℃ bottom temperature is denoted TB＝20℃；
8) The remaining total length of the alloy material is denoted as h;
9) when the directional solidification of the traveling wave magnetic field starts, a temperature monitoring system, a signal feedback system, a signal operation system and a drawing speed regulation system are started;
10) the technical flow chart shown in the attached figure 3 is adopted to realize real-time monitoring, feedback and operation of temperature and real-time regulation and control of drawing speed, and finally, the automatic, digital and intelligent preparation of the alloy in the wide solidification interval is completed.
According to research, the pulling speed of Al-Cu alloy is higher, the grains are finer, the pulling speed is usually 0.2mm/s, but the cooling speed is generally lower for a small-sized non-vacuum slow-cooling sequential solidification device, and is measured to be 0.3 ℃/s, and under the experimental condition, the traveling wave magnetic field has larger influence on the temperature field distribution of the mushy zone, so that the real-time automatic regulation and control method for directionally solidifying the wide solidification zone alloy mushy zone by the traveling wave magnetic field realizes effective real-time control of the whole temperature distribution of the mushy zone, controls the shape stability of a solid-liquid interface, and has important significance for regulating and controlling the solidification process and improving the alloy structure by matching the action of the traveling wave magnetic field.
Example two: al-5Cu wide solidification range alloy is used as a material, and the directional solidification technology of a traveling wave magnetic field is used for preparation at a higher cooling speed.
1) Calculating the liquidus temperature T of the alloy by utilizing an alloy phase diagram aiming at the Al-5Cu alloy materialLAt 648 ℃ and a solidus temperature TSIs 548 ℃, and the temperature interval (solid-liquid phase temperature difference) Delta T of the mushy zone is 100 ℃;
2) determining the constant cooling speed v according to actual experiment or production requirementsc＝2℃/s；
3) Determining the initial drawing speed v according to the actual experiment or production requirementsg＝0.2mm/s；
4) According to the constant cooling speed and the initial drawing speed, the formula G is adoptedT＝vc/vgDetermining the temperature gradient GT＝10℃/mm，
5) Determining the total length L of the temperature interval according to the temperature interval and the temperature gradientΔT＝10mm；
6) Setting total length L in optimal action area of traveling wave magnetic field generatorΔTAnd the measured temperatures of the five temperature measuring points which are equally spaced from each other from top to bottom are respectively represented as T1、T2、T3、T4、T5；
7) The heating temperature of the top of the alloy during solidification is denoted as TA750 ℃ bottom temperature is denoted TB＝20℃；
8) The remaining total length of the alloy material is denoted as h;
9) when the directional solidification of the traveling wave magnetic field starts, a temperature monitoring system, a signal feedback system, a signal operation system and a drawing speed regulation system are started;
10) the technical flow chart shown in the attached figure 3 is adopted to realize real-time monitoring, feedback and operation of temperature and real-time regulation and control of drawing speed, and finally, the automatic, digital and intelligent preparation of the alloy in the wide solidification interval is completed.
According to research, the pulling speed of Al-Cu alloy is larger, the grains are finer, the pulling speed of 0.2mm/s is generally selected, the cooling speed of a non-vacuum rapid cooling sequential solidification device is generally higher, and the pulling speed is measured to be 2 ℃/s, under the experimental condition, the moving speed of a mushy zone is higher, and the influence of a traveling wave magnetic field on the temperature field distribution of the mushy zone is larger, so that the real-time automatic regulation and control method for the directionally solidified wide solidification zone alloy mushy zone by the traveling wave magnetic field realizes effective real-time control of the whole temperature distribution of the mushy zone, controls the shape stability of a solid-liquid interface, and is of great significance in regulating and controlling the solidification process and improving the alloy structure by matching with the action of the traveling wave magnetic field.
Example three: the Pt-10Ag wide solidification interval alloy is used as a material, and the preparation is carried out by using a traveling wave magnetic field directional solidification technology at a higher cooling speed.
1) Calculating the liquidus temperature T of the alloy by utilizing an alloy phase diagram aiming at the Pt-10Ag alloy materialLAbout 1700 ℃, solidus temperature TSApproximately 1186 ℃, and obtaining that the temperature interval (solid-liquid phase temperature difference) delta T of the mushy zone is 514 ℃;
2) determining the constant cooling speed v according to actual experiment or production requirementsc＝5℃/s；
3) Determining the initial drawing speed v according to the actual experiment or production requirementsg＝0.2mm/s；
4) According to the constant cooling speed and the initial drawing speed, the formula G is adoptedT＝vc/vgDetermining the temperature gradient GT＝25℃/mm，
5) Determining the total length L of the temperature interval according to the temperature interval and the temperature gradientΔT＝20.6mm；
6) Setting total length L in optimal action area of traveling wave magnetic field generatorΔTAnd the measured temperatures of the five temperature measuring points which are equally spaced from each other from top to bottom are respectively represented as T1、T2、T3、T4、T5；
7) The heating temperature of the top of the alloy during solidification is denoted as TA1800 ℃ and the bottom temperature is denoted TB＝20℃；
8) The remaining total length of the alloy material is denoted as h;
9) when the directional solidification of the traveling wave magnetic field starts, a temperature monitoring system, a signal feedback system, a signal operation system and a drawing speed regulation system are started;
10) the technical flow chart shown in the attached figure 3 is adopted to realize real-time monitoring, feedback and operation of temperature and real-time regulation and control of drawing speed, and finally, the automatic, digital and intelligent preparation of the alloy in the wide solidification interval is completed.
For different alloys with wide solidification intervals, such as Pt-10Ag wide solidification interval alloys, under different experimental conditions, the problem of mushy zone temperature control exists, and the traveling wave magnetic field has a large influence on the temperature field distribution of the mushy zone, so that the real-time automatic regulation and control method for directionally solidifying the wide solidification interval alloy mushy zone by the traveling wave magnetic field can effectively control the whole temperature distribution of the mushy zone in real time, control the shape and the appearance of a solid-liquid interface to be stable, and has important significance for regulating and controlling the alloy structure in the solidification process by matching with the action of the traveling wave magnetic field.
Example four: the Al-5Cu wide-solidification-range alloy is used as a material, and the preparation is carried out at a lower cooling speed by adopting a directional solidification technology without applying a traveling wave magnetic field.
1) Alloy phase diagram calculation for Al-5Cu alloy materialLiquidus temperature T of the discharged alloyLAt 648 ℃ and a solidus temperature TSIs 548 ℃, and the temperature interval (solid-liquid phase temperature difference) Delta T of the mushy zone is 100 ℃;
2) determining the constant cooling speed v according to actual experiment or production requirementsc＝0.3℃/s；
3) Determining the initial drawing speed v according to the actual experiment or production requirementsg＝0.2mm/s；
4) According to the constant cooling speed and the initial drawing speed, the formula G is adoptedT＝vc/vgDetermining the temperature gradient GT＝1.5℃/mm，
5) Determining the total length L of the temperature interval according to the temperature interval and the temperature gradientΔT＝66.7mm；
6) The total length is set to be L in the space of the traveling wave magnetic field generator based on the actual size of the deviceΔTAnd the measured temperatures of the five temperature measuring points which are equally spaced from each other from top to bottom are respectively represented as T1、T2、T3、T4、T5；
7) The heating temperature of the top of the alloy during solidification is denoted as TA750 ℃ bottom temperature is denoted TB＝20℃；
8) The remaining total length of the alloy material is denoted as h;
9) when the directional solidification starts, the traveling wave magnetic field generator is not turned on, and only the temperature monitoring system, the signal feedback system, the signal operation system and the drawing speed regulation system are turned on;
10) the technical flow chart shown in the attached figure 3 is adopted to realize real-time monitoring, feedback and operation of temperature and real-time regulation and control of drawing speed, and finally, the automatic, digital and intelligent preparation of the alloy in the wide solidification interval is completed.
In the traditional directional solidification, a constant drawing speed is usually adopted for material preparation, the fact that the position of a mushy zone can change to a certain extent in the process of continuously drawing a sample downwards is not considered, and a better method and a better countermeasure are not adopted for the change of the mushy zone, so that when the directional solidification method is used for preparing the alloy with the wide solidification interval, more uncontrollable variables can be generated in the solidification process, and the experimental result is influenced. The real-time automatic regulation and control method for the alloy mushy zone in the wide solidification zone through directional solidification of the traveling wave magnetic field can effectively control the overall temperature distribution of the mushy zone in real time, control the shape stability of a solid-liquid interface, and has very important significance in regulating and controlling the solidification process and improving the alloy structure.
In general, the real-time automatic regulation and control method for the mushy zone of the traveling wave magnetic field directional solidification wide solidification interval alloy can effectively solve the problems of the current directional solidification and the temperature control of the wide solidification interval alloy in the current traveling wave magnetic field directional solidification technology, and effectively realize the real-time monitoring, feedback and regulation and control of the mushy zone temperature field distribution by utilizing the method, thereby regulating and controlling the solidification process and improving the alloy structure.
The second embodiment is as follows:
the device is a storage medium, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to realize the real-time automatic regulation and control method for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone.
The device described in the embodiment is a storage medium, and the storage medium stores a program corresponding to the real-time automatic regulation and control method for directionally solidifying the wide solidification interval alloy mushy zone by the traveling wave magnetic field.
The third concrete implementation mode:
the embodiment is a real-time automatic regulating and controlling device for directionally solidifying the wide solidification interval alloy mushy zone by the traveling wave magnetic field, and the device comprises a processor and a memory, wherein at least one instruction is stored in the memory, and is loaded and executed by the processor to realize the real-time automatic regulating and controlling method for directionally solidifying the wide solidification interval alloy mushy zone by the traveling wave magnetic field.
The device of the embodiment at least comprises a processor, a memory and other components, wherein the memory stores a program corresponding to the real-time automatic regulation and control method for directionally solidifying the wide solidification interval alloy mushy zone by the traveling wave magnetic field; the processor is used for loading and/or executing the corresponding program.
The present invention is capable of other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the spirit and scope of the present invention.
Claims (5)
1. The real-time automatic regulation and control method for the alloy mushy zone in the wide solidification interval by directional solidification in the traveling wave magnetic field is characterized by comprising the following steps of:
s1, calculating the liquidus temperature T of the alloy by utilizing the alloy phase diagram according to different wide solidification interval alloy materialsLSolidus temperature TSAnd obtaining a temperature interval delta T of the mushy zone;
s2, determining the constant cooling speed v according to actual experiment or production needsc；
S3, determining the initial drawing speed v according to actual experiment or production requirementsg；
S4, according to the constant cooling speed and the initial drawing speed, passing the formula GT＝vc/vgDetermining the temperature gradient GT，
S5, passing through L according to the temperature interval and the temperature gradient of the mushy zoneΔT＝ΔT/GTDetermining the total length L of the temperature interval of the mushy zoneΔT；
S6, setting the total length L in the optimal action area of the traveling wave magnetic field generatorΔTEvenly dividing N-1 into N equal parts, setting N temperature measuring points, wherein N is more than or equal to 3, and sequentially representing the measured temperature as T from the top to the bottom of the alloy1、T2、……、TN；
S7, and the heating temperature of the top of the alloy in the process of solidification is expressed as TABottom temperature is denoted TB；
The T isA＞TLSaid T isB＜TS；
S8 temperature T1、T2、……、TNAnd TA、TBReal-time monitoring based on TL、TSAnd T1、T2、……、TNThe relation of (1), directional solidification is carried out by utilizing a traveling wave magnetic field;
simultaneously monitoring the total length h of the residual melt of the alloy material, and when h is more than or equal to LΔTWhen the directional solidification is continued, when h<LΔTWhen the temperature is not regulated, the residual melt is free to be cooled and solidified.
2. The method for automatically regulating and controlling the mushy zone of the traveling wave magnetic field directionally solidified wide solidification interval alloy in real time according to claim 1, wherein N is 5.
3. The method for automatically regulating and controlling the mushy zone of the traveling wave magnetic field directional solidification wide-solidification interval alloy according to claim 2, wherein the mushy zone is based on TL、TSAnd T1、T2、……、TNThe process of directional solidification by using the traveling wave magnetic field comprises the following steps:
(1) setting the heating temperature T of the top of the alloyABottom temperature TB；
(2) Determining whether the traveling wave magnetic field is opened, if so, performing the step (3), otherwise, performing the step (4);
(3) determining whether the mushy zone is in the optimal action area of the magnetic field, if so, performing the step (4), otherwise, performing the step (5);
(4) setting an initial drawing speed vgInitial cooling velocity vc(ii) a Then executing the step (8);
(5) determining whether the mushy zone is higher than the optimal action area of the magnetic field, if so, performing the step (6), otherwise, performing the step (7);
(6) setting an initial drawing speed vgV initial cooling velocity vc(ii) a Then returning to the step (3);
wherein Δ v is the drawing speed variation;
(7) setting an initial drawing speed vgΔ v, initial cooling velocity vc(ii) a Then returns toStep (3);
(8) and determining TLWhether or not T is greater than or equal to1If yes, executing step (9); otherwise, executing the step (10);
(9) and determining T5Whether or not T is greater than or equal toSIf yes, executing step (14); otherwise, executing step (15);
(10) and determining TLWhether or not T is greater than or equal to5If yes, executing step (11); otherwise stop vgIncrease vcDecrease TA、TBAnd continue to judge TLWhether or not T is greater than or equal to5；
(11) And determining TLWhether or not T is greater than or equal to4If yes, executing step (12); otherwise stop vgIncrease vcDecrease TAAnd continue to judge TLWhether or not T is greater than or equal to4；
(12) And determining TLWhether or not T is greater than or equal to3If yes, executing step (13); otherwise stop vgIncrease vcAnd continue to judge TLWhether or not T is greater than or equal to3；
(13) And determining TLWhether or not T is greater than or equal to2If it is decreasing vgAnd returning to the step (8); otherwise reduce vgIncrease vcAnd continue to judge TLWhether or not T is greater than or equal to2；
(14) Continuously maintaining TA、TB、vg、vcDecreasing, executing step (19);
(15) and determining TSWhether or not T is greater than or equal to1If yes, executing step (16); otherwise stop vgStop vcIncrease TA、TBAnd continue to judge TSWhether or not T is greater than or equal to1；
(16) And determining TSWhether or not T is greater than or equal to2If yes, executing step (17); otherwise increase vgStop vcIncrease TAAnd continue to judge TSWhether or not T is greater than or equal to2；
(17) And determining TSWhether or not T is greater than or equal to3If yes, executing step (18); otherwise increase vgStop vcAnd continue to judge TSWhether or not T is greater than or equal to3；
(18) And determining TSWhether or not T is greater than or equal to4If v is increasedgAnd returning to the step (9); otherwise increase vgDecrease vcAnd continue to judge TSWhether or not T is greater than or equal to4；
(19) H is judged to be more than or equal to LΔTAnd if yes, returning to the step (8), otherwise, ending.
4. The real-time automatic control device for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone is a storage medium, and is characterized in that at least one instruction is stored in the storage medium and loaded and executed by a processor to realize the real-time automatic control method for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone according to any one of claims 1 to 3.
5. The real-time automatic regulation and control device for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone comprises a processor and a memory, and is characterized in that at least one instruction is stored in the memory and loaded and executed by the processor to realize the real-time automatic regulation and control method for the traveling wave magnetic field directional solidification wide solidification interval alloy mushy zone as claimed in any one of claims 1 to 3.
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