CN103472085A - Experimental equipment and experimental method for Ti-Al base alloy directional solidification under action of direct current - Google Patents
Experimental equipment and experimental method for Ti-Al base alloy directional solidification under action of direct current Download PDFInfo
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Abstract
The invention relates to experimental equipment and an experimental method for Ti-Al base alloy directional solidification under the action of direct current. The experimental equipment and an experimental method solve the problems that lead-in of impressed current can not be achieved in the process of directional solidification and the intensity of lead-in voltage can not be confirmed. According to the experimental equipment, a positive pole molybdenum wire is connected with the upper end of a Ti-Al base alloy directional solidification sample and a DC stabilized power supply, and insulation glass fiber cloth is connected with the positive pole molybdenum wire. A negative pole molybdenum wire is connected with the lower end of the Ti-Al base alloy directional solidification sample and the DC stabilized power supply. The experimental method includes the first step of closing a furnace door, opening a vacuum pump, vacuumizing and leading argon in the vacuum pump, and then closing the mechanical vacuum pump, the second step of starting up a water suction pump, turning on an induction heating power supply, loading power hierarchically and then carrying out heat preservation, the third step of starting up the DC stabilized power supply, and setting output voltage and velocity for pulling down a pull rod, and the fourth step of stopping heating and turning off the DC stabilized power supply when the pulling length reaches 35mm, the temperature in a furnace reaches indoor temperature, and taking out the sample. The experimental equipment and the experimental method are applied to Ti-Al base alloy directional solidification experiments.
Description
Technical field
The present invention relates to the base alloy directionally solidified equipment of a kind of Ti-Al and clotting method, be specifically related to the base alloy directionally solidified experimental facilities of Ti-Al and experimental technique under a kind of DC current effect.
Background technology
At present, many advantages such as foundry engieering is applied widely with it in materials processing technology, manufacturing accuracy is high and with low cost are still occupied extremely important status, although people make the performance of foundry goods obtain great lifting by various technological means, but still can't meet the requirement of equipment manufacture to material, what especially at aerospace field, show is very outstanding.In order to improve the efficiency of aerospace vehicle, people have been developed the material of various new and novel casting process technology in recent years.The successful development of nickel-base alloy, just greatly advanced the application of gas-turbine unit at aviation field, but along with aero-turbine front end temperature and thrust-weight ratio constantly rise, make the usability raising of these two kinds of traditional high-temperature structural materials of titanium group high temperature alloy and nickel-base alloy reach the limit, therefore must continue the technical requirement condition that the more advanced new material of research and casting technique could meet following gas-turbine unit.
The solidification technology development changes in recent years, has produced a lot of novel solidification process control methods, and these novel method centre field effects are fairly obvious on the impact of metal solidification texture, in Mechanism Study and application facet, obtained significant progress.Modern society attaches great importance to environmental protection on the other hand, utilizes the solidification technology under outer field action, not only can reduce environmental pollution, but also can avoid the pollution of alloy melt, and this long term growth to material processing technique is very important.
improve the effective way of Ti-Al base alloy property:ti-Al base alloy has the ubiquitous drawback of intermetallic compound, is exactly that its plasticity is very low at ambient temperature, and this has caused obstruction for the large-scale application of Ti-Al base alloy, and this is also that researcher is made great efforts the bottleneck problem solved simultaneously.The experimental results shows that the mechanical property of Ti-Al base alloy and its microstructure and alloying component have closely and contacts.
By adding solid solution element or precipitation strength, controlling high-temperature oxidation resistance and mechanical property that the methods such as grain size and tissue morphology can effectively be improved Ti-Al base alloy.The content that adds alloying element or Al element can change the lattice parameter that affects Ti-Al base alloy, is conducive to put forward heavy alloyed plasticity.Unit-cell volume reduces to make the interaction force between the Ti-Al atom to strengthen, and this can weaken the covalency key, thereby the plasticity of alloy is raise.
By the lamellar orientation in the base alloy directionally solidified tissue of control Ti-Al, with the performance that improves Ti-Al base alloy, be one of main direction of the base alloy directionally solidified research of Ti-Al.The affect highly significant of the lamellar orientation of γ-Ti-Al alloy on its mechanical property.Can find that its mechanical property constantly changes with the variation of the angle that is subject to force direction with lamellar orientation, when angle is 0 °, alloy has best plasticity and the coupling of intensity, during this state, the combination property of material is also best, when angle is 90 °, the intensity of alloy is the highest, but plasticity is minimum, this situation should be avoided.
electric current is to improving the effect of Ti-Al base alloy structure performance:utilize electric current to improve the base alloy directionally solidified tissue of Ti-Al and opened up a kind of new approach that improves Ti-Al base alloy structure and performance, although the directional solidification experimental technique under the function of current that had the scholar to invent, but be all for the active low and low-melting alloy of specializes in chemistry, and high high-melting-point alloy does not also relate to for activity.For example, so, because relatively more active its requirement to equipment of the chemical activity of Ti-Al base alloy is also higher, so there are some technological difficulties in experiment: magnetic field during induction graphite cannula heating sample on sample can interact with impressed current; The base alloy directionally solidified process of Ti-Al under can not the Real Time Observation function of current, being unfavorable for carrying out electric current affects the research of mechanism to it; Very active during the high and high temperature of the fusing point of Ti-Al base alloy, therefore very high to the requirement of formwork.
But, take the electromagnetic cold crucible apparatus for directional solidification when platform carries out the experiment of Ti-Al base directional solidification under the DC current effect, also there is a technical matters: the problem that impressed current is introduced in the directional solidification process, and the problem that can't determine the size of introducing voltage.
Summary of the invention
The object of the invention is to propose the base alloy directionally solidified experimental facilities of Ti-Al and the experimental technique under a kind of DC current effect, solve and take the electromagnetic cold crucible apparatus for directional solidification when platform carries out the experiment of Ti-Al base directional solidification under the DC current effect, can't be in the directional solidification process problem introduced of impressed current, and can't determine the problem of introducing voltage swing.
The present invention in order to solve the problems of the technologies described above taked technical scheme is:
The base alloy directionally solidified experimental facilities of Ti-Al under DC current effect of the present invention comprises feeding rod, gas inlet and outlet, the insulating glass fiber cloth, load coil, graphite cannula, cooling bath, the cooling liquid state metal, lower pumping rod, the directional solidification body of heater, formwork, thermopair, temperature measurer, vacuum pump, argon gas gas injection pump, three-way valve, graphite felt, circulating water pipe and water pump, be fitted with gas inlet and outlet on the upper portion side wall of described directional solidification body of heater, the outer end of gas inlet and outlet is communicated with vacuum pump and argon gas gas injection pump by three-way valve, be fitted with feeding rod on the roof of described body of heater, the lower end of upper feeding rod is connected with the insulating glass fiber cloth, described cooling bath is arranged on the base plate of directional solidification body of heater, be marked with the cooling liquid state metal in cooling bath, the upper end of lower pumping rod is placed in directional solidification body of heater inside through the bottom of directional solidification body of heater, described graphite felt is arranged in the directional solidification body of heater, described graphite felt has center pit, the lower end of formwork is connected with lower pumping rod through center pit, the base alloy directionally solidified sample of Ti-Al is arranged in formwork, graphite cannula and load coil are enclosed within on formwork from inside to outside successively, one end of thermopair contacts with the base alloy directionally solidified sample of Ti-Al, the sidewall that the other end of thermopair passes the directional solidification body of heater is connected with temperature measurer, circulating water pipe and water pump are communicated with,
The base alloy directionally solidified experimental facilities of Ti-Al under described DC current effect also comprises anodal molybdenum filament, constant voltage dc source and negative pole molybdenum filament, one end of described anodal molybdenum filament is connected with the upper end of the base alloy directionally solidified sample of Ti-Al, the insulating glass fiber cloth is connected with anodal molybdenum filament, the sidewall that the other end of anodal molybdenum filament passes the directional solidification body of heater is connected with constant voltage dc source, one end of negative pole molybdenum filament is connected with the base alloy directionally solidified sample of Ti-Al lower end through formwork, and the sidewall that the other end of negative pole molybdenum filament passes the directional solidification body of heater is connected with constant voltage dc source.
Preferably: the diameter of described anodal molybdenum filament and negative pole molybdenum filament is 1mm.In experiment, be to adopt the molybdenum filament that resistant to elevated temperatures diameter is 1mm to introduce.Verify by experiment that in addition the anodal molybdenum filament of single turn and negative pole molybdenum filament maximum can introduce the DC current of 15A, can increase the maximal value of introducing electric current by the number of turn that increases anodal molybdenum filament and negative pole molybdenum filament.
Preferably: described formwork is yttrium oxide shuttering.
Preferably: described vacuum pump is oil-sealed rotary pump.
Preferably: described cooling bath is the gallium indium cooling bath.
Preferably: described cooling liquid state metal is the gallium indium liquid coolant.
Preferably: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb, the female ingot of its alloy adopts the consumable arc-melting stove to carry out melting and obtains, make the ingot casting that diameter is 150mm after the melting casting, the recycling line cutting technology cuts from the female ingot of alloy the charge bar that diameter is 14.5mm.
The present invention is based on the experimental technique that the base alloy directionally solidified experimental provision of Ti-Al under the DC current effect described in such scheme one carries out, concrete steps are:
Step 1: the base alloy directionally solidified sample of Ti-Al of packing in directional solidification furnace, close the directional solidification furnace door, open vacuum pump, discharge air in directional solidification furnace to the directional solidification furnace pressure below 5Pa, then passing into argon gas to directional solidification furnace pressure is 300Pa, again vacuumizes, and so repeats twice, finally passing into argon gas to directional solidification furnace pressure is 300Pa, closes oil-sealed rotary pump;
Step 2: open the cool cycles water pipe, start suction pump, open induction heating power, hierarchical loading power, when the temperature measurer displays temperature is 1600 ℃, stop continuing to increase power, then is incubated 5min;
Step 3: start constant voltage dc source, the setting output voltage is 5V to 15V, and the speed of setting lower pumping rod is 0.6mm/min to 1mm/min, and the speed of upper feeding rod keeps identical with the speed of lower pumping rod;
When pull length arrives 35mm, stop heating, close induction heating power, stop pull, then close constant voltage dc source, suction pump remains in operation, until the temperature measurer displays temperature is between 22 degrees centigrade to 25 degrees centigrade, close again suction pump, open fire door, take out the base alloy directionally solidified sample of Ti-Al.
Preferably: described hierarchical loading power is specially: the initial voltage of loading is 50V, and then every 2min rising 10V, until the voltage loaded reaches 100V, the adjustment magnitude of voltage finally shown in conjunction with thermopair, make temperature stabilization at 1600 ℃.
Preferably: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb, the female ingot of its alloy adopts the consumable arc-melting stove to carry out melting and obtains, make the ingot casting that diameter is 150mm after the melting casting, the recycling line cutting technology cuts from the female ingot of alloy the charge bar that diameter is 14.5mm.
Preferably: the speed of described lower pumping rod is 0.6mm/min or 1mm/min.
The present invention compared with prior art has following effect: the invention solves can't be in the directional solidification process problem introduced of impressed current, and can't determine the problem of introducing voltage swing, for Ti-Al base alloy provides foundation in actual use.
The accompanying drawing explanation
Fig. 1 is the base alloy directionally solidified experimental facilities schematic diagram of the Ti-Al under DC current effect of the present invention;
Fig. 2 is with corundum (Al
2o
3) the directional solidification assay maps of the Ti-Al base alloy for preparing of formwork;
Fig. 3 is with yttria (Y
2o
3) the directional solidification assay maps of the Ti-Al base alloy for preparing of formwork;
Fig. 4 is withdrawing rate alloy directionally solidified stable growth district tissue topography that organizes of Ti-48Al-2Cr-2Nb while being 1.0mm/min;
Fig. 5 is withdrawing rate alloy directionally solidified stable growth district tissue topography that organizes of Ti-48Al-2Cr-2Nb while being 0.6mm/min;
In figure: the upper feeding rod of 1-, 2-gas inlet and outlet, 3-insulating glass fiber cloth, 4-load coil, the 5-graphite cannula, 6-cooling bath, 7-cooling liquid state metal, pumping rod under 8-, the anodal molybdenum filament of 9-, 10-constant voltage dc source, 11-negative pole molybdenum filament, the base alloy directionally solidified sample of 12-Ti-Al, 13-directional solidification body of heater, 14-formwork, 15-thermopair, 16-temperature measurer, the 17-vacuum pump, 18-argon gas gas injection pump, 19-three-way valve, the 20-graphite felt, 21-water pump, 22-circulating water pipe.
Embodiment
Below elaborate with reference to the accompanying drawings the preferred embodiment of the present invention.
Embodiment one: present embodiment is described in conjunction with Fig. 1: the base alloy directionally solidified experimental facilities of Ti-Al under the DC current effect of present embodiment comprises upper feeding rod 1, gas inlet and outlet 2, insulating glass fiber cloth 3, load coil 4, graphite cannula 5, cooling bath 6, cooling liquid state metal 7, lower pumping rod 8, directional solidification body of heater 13, formwork 14, thermopair 15, temperature measurer 16, vacuum pump 17, argon gas gas injection pump 18, three-way valve 19, graphite felt 20, circulating water pipe 22 and water pump 21, be fitted with gas inlet and outlet 2 on the upper portion side wall of described directional solidification body of heater 13, the outer end of gas inlet and outlet 2 is communicated with vacuum pump 17 and argon gas gas injection pump 18 by three-way valve 19, be fitted with feeding rod 1 on the roof of described body of heater 13, the lower end of upper feeding rod 1 is connected with insulating glass fiber cloth 3, described cooling bath 6 is arranged on the base plate of directional solidification body of heater 13, be marked with cooling liquid state metal 7 in cooling bath 6, the upper end of lower pumping rod 8 is placed in directional solidification body of heater 13 inside through the bottom of directional solidification body of heater 13, described graphite felt 20 is arranged in directional solidification body of heater 13, described graphite felt 20 has center pit, the lower end of formwork 14 is connected with lower pumping rod 8 through center pit, the base alloy directionally solidified sample 12 of Ti-Al is arranged in formwork 14, graphite cannula 5 and load coil 4 are enclosed within on formwork 14 from inside to outside successively, one end of thermopair 15 contacts with the base alloy directionally solidified sample 12 of Ti-Al, the sidewall that the other end of thermopair 15 passes directional solidification body of heater 13 is connected with temperature measurer 16, circulating water pipe 22 and water pump 21 are communicated with,
The base alloy directionally solidified experimental facilities of Ti-Al under described DC current effect also comprises anodal molybdenum filament 9, constant voltage dc source 10 and negative pole molybdenum filament 11, one end of described anodal molybdenum filament 9 is connected with the upper end of the base alloy directionally solidified sample 12 of Ti-Al, insulating glass fiber cloth 3 is connected with anodal molybdenum filament 9, the sidewall that the other end of anodal molybdenum filament 9 passes directional solidification body of heater 13 is connected with constant voltage dc source 10, one end of negative pole molybdenum filament 11 is connected with the base alloy directionally solidified sample of Ti-Al 12 lower ends through formwork 14, the sidewall that the other end of negative pole molybdenum filament 11 passes directional solidification body of heater 13 is connected with constant voltage dc source 10.
Further: the diameter of described anodal molybdenum filament 9 and negative pole molybdenum filament 11 is 1mm.In experiment, be to adopt the molybdenum filament that resistant to elevated temperatures diameter is 1mm to introduce.Verify by experiment that in addition the anodal molybdenum filament 9 of single turn and negative pole molybdenum filament 11 maximums can introduce the DC current of 15A, can increase the maximal value of introducing electric current by the number of turn that increases anodal molybdenum filament 9 and negative pole molybdenum filament 11.
Further: described formwork 14 is yttrium oxide shuttering.Before the base alloy directionally solidified experiment of TiAl under the function of current, need to be at the TiAl base alloy oriented specimen at first obtained under the no current effect, because the chemical activity of TiAl base alloy melt is very high, so under the condition of high temperature can with all formwork material generation chemical reactions of current use, cause alloy surface and inside to be polluted.For the oriented freezing organization that obtains TiAl base alloy under the condition of this experiment respectively to corundum (Al
2o
3) formwork and yttria (Y
2o
3) formwork tested, and obtains result as shown in Figures 2 and 3, can find that the middle part of the directional solidification sample of the Ti-Al base alloy for preparing with the corundum formwork forms than gross blow hole, and run through whole sample, and the sample prepared with yttrium oxide shuttering does not have pore.The appearance of pore is not only bad for the carrying out of directional solidification, and can make the base alloy directionally solidified experiment of TiAl under the function of current form and open circuit in experimentation, cause impressed current to load unsuccessfully, thereby cause the failure of an experiment, the base alloy directionally solidified experiment of TiAl of therefore carrying out under the function of current with the corundum formwork is infeasible.Yttrium oxide shuttering prepares sample and does not form pore, is because yttria has higher thermodynamic stability, so use yttrium oxide shuttering can ensure carrying out smoothly of the base alloy directionally solidified experiment of TiAl.
Further: described vacuum pump 17 is oil-sealed rotary pump.
Further: described cooling bath 6 is the gallium indium cooling bath.
Further: described cooling liquid state metal 7 is the gallium indium liquid coolant.
Further: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb, the female ingot of its alloy adopts the consumable arc-melting stove to carry out melting and obtains, make the ingot casting that diameter is 150mm after the melting casting, the recycling line cutting technology cuts from the female ingot of alloy the charge bar that diameter is 14.5mm.
Embodiment two: in conjunction with Fig. 1 to Fig. 5, present embodiment is described, the base alloy directionally solidified experimental technique of Ti-Al under the DC current effect of present embodiment is based on that experimental facilities in embodiment one realizes, concrete steps are:
Step 1: the base alloy directionally solidified sample of Ti-Al of packing in directional solidification furnace, close the directional solidification furnace door, open vacuum pump, air in the discharge directional solidification furnace is to the directional solidification furnace pressure below 5Pa, and then passing into argon gas to directional solidification furnace pressure is 300Pa, again vacuumizes, so repeat twice, to guarantee that the body of heater inner air is drained, finally passing into argon gas to directional solidification furnace pressure is 300Pa, closes oil-sealed rotary pump;
Step 2: open the cool cycles water pipe, start suction pump, open induction heating power, hierarchical loading power, when the temperature measurer displays temperature is 1600 ℃, stop continuing to increase power, then is incubated 5min;
Step 3: start constant voltage dc source, the setting output voltage is 5V to 15V, and the speed of setting lower pumping rod is 0.6mm/min to 1mm/min, and the speed of upper feeding rod keeps identical with the speed of lower pumping rod;
When pull length arrives 35mm, stop heating, close induction heating power, stop pull, then close constant voltage dc source, suction pump remains in operation, until the temperature measurer displays temperature is between 22 degrees centigrade to 25 degrees centigrade, close again suction pump, open fire door, take out the base alloy directionally solidified sample of Ti-Al.
Further: described hierarchical loading power is specially: the initial voltage of loading is 50V, and then every 2min rising 10V, until the voltage loaded reaches 100V, the adjustment magnitude of voltage finally shown in conjunction with thermopair, make temperature stabilization at 1600 ℃.
Further: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb, the female ingot of its alloy adopts the consumable arc-melting stove to carry out melting and obtains, make the ingot casting that diameter is 150mm after the melting casting, the recycling line cutting technology cuts from the female ingot of alloy the charge bar that diameter is 14.5mm.
Further: the speed of described lower pumping rod is 0.6mm/min or 1mm/min.
Under the condition that is 1600 ℃ in heating-up temperature, do not obtain the oriented freezing organization column crystal while at first with the withdrawing rate of 1.0mm/min, carrying out the directional solidification experiment of Ti-48Al-2Cr-2Nb alloy, as shown in Figure 4.Known according to the metal freezing principle, obtain the constitutional supercooling that oriented freezing organization must suppress the solid-liquid interface front end, in view of the rising with heating-up temperature, Ti-Al base alloy reacts strong with regard to Shaoxing opera with formwork, so adopt the mode of the withdrawing rate (being growth rate) in the situation that the uniform temp gradient slows down to promote the formation of columanar structure.When withdrawing rate drops to 0.6mm/min, obtain columanar structure as shown in Figure 5.
Present embodiment, just to the exemplary illustration of this patent, does not limit its protection domain, and those skilled in the art can also be changed its part, as long as no the Spirit Essence that exceeds this patent, all in the protection domain of this patent.
Claims (10)
1. the base alloy directionally solidified experimental facilities of Ti-Al under the DC current effect, it comprises feeding rod (1), gas inlet and outlet (2), insulating glass fiber cloth (3), load coil (4), graphite cannula (5), cooling bath (6), cooling liquid state metal (7), lower pumping rod (8), directional solidification body of heater (13), formwork (14), thermopair (15), temperature measurer (16), vacuum pump (17), argon gas gas injection pump (18), three-way valve (19), graphite felt (20), circulating water pipe (22) and water pump (21), be fitted with gas inlet and outlet (2) on the upper portion side wall of described directional solidification body of heater (13), the outer end of gas inlet and outlet (2) is communicated with vacuum pump (17) and argon gas gas injection pump (18) by three-way valve (19), be fitted with feeding rod (1) on the roof of described body of heater (13), the lower end of upper feeding rod (1) is connected with insulating glass fiber cloth (3), described cooling bath (6) is arranged on the base plate of directional solidification body of heater (13), be marked with cooling liquid state metal (7) in cooling bath (6), the upper end of lower pumping rod (8) is placed in directional solidification body of heater (13) inside through the bottom of directional solidification body of heater (13), described graphite felt (20) is arranged in directional solidification body of heater (13), described graphite felt (20) has center pit, the lower end of formwork (14) is connected with lower pumping rod (8) through center pit, the base alloy directionally solidified sample of Ti-Al (12) is arranged in formwork (14), graphite cannula (5) and load coil (4) are enclosed within on formwork (14) from inside to outside successively, one end of thermopair (15) contacts with the base alloy directionally solidified sample of Ti-Al (12), the sidewall that the other end of thermopair (15) passes directional solidification body of heater (13) is connected with temperature measurer (16), circulating water pipe (22) and water pump (21) are communicated with,
It is characterized in that: the base alloy directionally solidified experimental facilities of Ti-Al under described DC current effect also comprises anodal molybdenum filament (9), constant voltage dc source (10) and negative pole molybdenum filament (11), one end of described anodal molybdenum filament (9) is connected with the upper end of the base alloy directionally solidified sample of Ti-Al (12), insulating glass fiber cloth (3) is connected with anodal molybdenum filament (9), the sidewall that the other end of anodal molybdenum filament (9) passes directional solidification body of heater (13) is connected with constant voltage dc source (10), one end of negative pole molybdenum filament (11) is connected with the base alloy directionally solidified sample of Ti-Al (12) lower end through formwork (14), the sidewall that the other end of negative pole molybdenum filament (11) passes directional solidification body of heater (13) is connected with constant voltage dc source (10).
2. the base alloy directionally solidified experimental facilities of Ti-Al under DC current effect according to claim 1, it is characterized in that: the diameter of described anodal molybdenum filament (9) and negative pole molybdenum filament (11) is 1mm.
3. the base alloy directionally solidified experimental facilities of Ti-Al under DC current effect according to claim 1, it is characterized in that: described formwork (14) is yttrium oxide shuttering.
4. according to the base alloy directionally solidified experimental facilities of Ti-Al under claim 1,2 or 3 described DC current effects, it is characterized in that: described vacuum pump (17) is oil-sealed rotary pump.
5. the base alloy directionally solidified experimental facilities of Ti-Al under DC current effect according to claim 4, it is characterized in that: described cooling bath (6) is the gallium indium cooling bath; Described cooling liquid state metal (7) is the gallium indium liquid coolant.
6. the base alloy directionally solidified experimental facilities of Ti-Al under DC current effect according to claim 5, it is characterized in that: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb.
7. the base alloy directionally solidified experimental technique of Ti-Al under the DC current effect, it is characterized in that: concrete steps are:
Step 1: the base alloy directionally solidified sample of Ti-Al of packing in directional solidification furnace, close the directional solidification furnace door, open vacuum pump, discharge air in directional solidification furnace to the directional solidification furnace pressure below 5Pa, then passing into argon gas to directional solidification furnace pressure is 300Pa, again vacuumizes, and so repeats twice, finally passing into argon gas to directional solidification furnace pressure is 300Pa, closes oil-sealed rotary pump;
Step 2: open the cool cycles water pipe, start suction pump, open induction heating power, hierarchical loading power, when the temperature measurer displays temperature is 1600 ℃, stop continuing to increase power, then is incubated 5min;
Step 3: start constant voltage dc source, the setting output voltage is 5V to 15V, and the speed of setting lower pumping rod is 0.6mm/min to 1mm/min, and the speed of upper feeding rod keeps identical with the speed of lower pumping rod;
When pull length arrives 35mm, stop heating, close induction heating power, stop pull, then close constant voltage dc source, suction pump remains in operation, until the temperature measurer displays temperature is between 22 degrees centigrade to 25 degrees centigrade, close again suction pump, open fire door, take out the base alloy directionally solidified sample of Ti-Al.
8. the base alloy directionally solidified experimental technique of Ti-Al under DC current effect according to claim 7, it is characterized in that: hierarchical loading power is specially: the initial voltage of loading is 50V, then every 2min rising 10V, until the voltage loaded reaches 100V, the adjustment magnitude of voltage finally shown in conjunction with thermopair, make temperature stabilization at 1600 ℃.
9. the base alloy directionally solidified experimental technique of Ti-Al under DC current effect according to claim 8, it is characterized in that: the base alloy directionally solidified sample of described Ti-Al is the alloy directionally solidified sample of Ti-48Al-2Cr-2Nb, the female ingot of its alloy adopts the consumable arc-melting stove to carry out melting and obtains, make the ingot casting that diameter is 150mm after the melting casting, the recycling line cutting technology cuts from the female ingot of alloy the charge bar that diameter is 14.5mm.
10. the base alloy directionally solidified experimental technique of Ti-Al under DC current effect according to claim 9, it is characterized in that: the speed of described lower pumping rod is 0.6mm/min or 1mm/min.
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| CN104569031B (en) * | 2014-12-26 | 2017-06-13 | 广东工业大学 | For the experimental provision and method of nano-fluid directional solidification |
| CN107153025A (en) * | 2016-03-03 | 2017-09-12 | 中南大学 | Device prepared by the high flux of the high flux preparation method of material, its application and material |
| CN113846278A (en) * | 2021-09-23 | 2021-12-28 | 哈尔滨工业大学 | Device for preparing oriented TiAl-based alloy by utilizing solid-state phase transition and preparation method thereof |
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| CN1733391A (en) * | 2005-09-02 | 2006-02-15 | 哈尔滨工业大学 | Directional freeze method for TiAl-based alloy plate |
| CN101653825A (en) * | 2009-09-24 | 2010-02-24 | 哈尔滨工业大学 | High-pressure counter-pressure casting method of Al-5 percent Cu base alloy |
| CN102011078A (en) * | 2010-12-23 | 2011-04-13 | 哈尔滨工业大学 | Method for refined and directional solidification of titanium aluminium alloy slab surface structure |
| CN102672150A (en) * | 2012-05-14 | 2012-09-19 | 北京科技大学 | Direct control method for titanium-aluminum-niobium alloy lamellar structure |
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| CN104569031B (en) * | 2014-12-26 | 2017-06-13 | 广东工业大学 | For the experimental provision and method of nano-fluid directional solidification |
| CN107153025A (en) * | 2016-03-03 | 2017-09-12 | 中南大学 | Device prepared by the high flux of the high flux preparation method of material, its application and material |
| CN113846278A (en) * | 2021-09-23 | 2021-12-28 | 哈尔滨工业大学 | Device for preparing oriented TiAl-based alloy by utilizing solid-state phase transition and preparation method thereof |
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