CN103484802B - Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt - Google Patents
Preparation method for obtaining kilogram-grade high temperature alloy undercooled melt Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title abstract description 14
- 239000000956 alloy Substances 0.000 title abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000006698 induction Effects 0.000 claims abstract description 25
- 238000013021 overheating Methods 0.000 claims abstract description 18
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- 239000004615 ingredient Substances 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 16
- 238000005266 casting Methods 0.000 abstract description 15
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Abstract
Disclosed is a preparation method for obtaining a kilogram-grade high temperature alloy undercooled melt. According to the preparation method, a medium-frequency induction power source is adopted as a heating power source, a convection current is generated through medium-frequency induction heating, and a macroscopic temperature field of the melt is more even so as to ensure that the melt is evenly cooled at the same time. A high-purity quartz crucible is used as a heating crucible, a B2O3 glass fusion covering agent is used as a cleaning agent or argon is inflated for protection, repeated circulated overheating treatment is adopted to conduct purification treatment on the melt, and the best purification effect is achieved by controlling the overheating temperature, the heat preservation temperature and the cycle index. The cooling rate is reasonably controlled, the temperature difference between the interior and the exterior of the melt is limited within 3 DEG C, and the whole melt is evenly cooled at the same time. The temperature field obtained by the preparation method and the structure of the melt are better in evenness, the whole kilogram-grade undercooled melt is in the undercooled state, the undercooled melt is better in flowability, and the solid fraction is lower than 0.2%. The preparation method is applicable to the field of micro-casting, and whole fine-grain ingot castings can be obtained by controlling the follow-up cooling speed of the kilogram-grade undercooled melt.
Description
Technical field
The present invention relates to superalloy and cross the solid field of condensation, be specially a kind of preparation method obtaining feather weight superalloy subcooling films.
Background technology
Melt treatment is as the important means of grain refining, be widely used in superalloy, and the acquisition of subcooling films ensures the successful critical process of fine crystal solidification, can the thermal history before melt solidifying and follow-up temperature control method play most important effect to obtain fine grained texture, by carrying out special temperature control process to melt, good subcooling films can be obtained.People have developed the method for the thin brilliant casting of some superalloy thermal controls, and the method industrially used mainly is divided into: high undercooling and common thermal control method.
The people such as Li Delin are at " China YouSe Acta Metallurgica Sinica ", 1994,4 (1), p123-128 writes " grain refining of bulk Undercooled Ni-Base Alloy ", this article reports and adopts scavenging agent and cyclical superheating method, carries out the thermal cycling of 2-3 time " heating and melting-overheating insulation-cooled and solidified ", cuts off high frequency electric source subsequently, allow sample naturally cooling, obtain alloy Ni
77si
13b
10at the tissue that condensate depression is 280 DEG C, but homogeneity of structure is poor, and the dendrite of existing prosperity also has tiny granular crystal; Its reason is, when the inside and outside heat radiation before forming core of melt after cutting off the electricity supply is uneven, could not obtain real high undercooling melt.
Patent Office of the People's Republic of China discloses the patent application patent that (publication number: CN1232885) name is called " a kind of method that elementide subcooling films solidifies " on October 12nd, 1999, can to cross cold metal and alloy sample directly introduce there is with nucleus same size magnitude elementide to trigger and to control nucleation process, solidified structure needed for obtaining.Although above method can obtain fine grained texture, because melt is to the susceptibility of composition, elementide add the performance that may affect alloy, and different alloys needs to add different elementides, and application is restricted.
Patent Office of the People's Republic of China discloses the patent application patent that (publication number: CN1598005) name is called " a kind of method that high undercooling melt prepares bulk nanocrystalline alloy " on March 23rd, 2005, achieve test button formerly to solidify under glass-coated cooling at a slow speed and reach high undercooling then rapid solidification, or with rare gas element, alloy melt is blown in the metal pattern of heat-eliminating medium pressure cooling, rapid solidification obtains bulk nanocrystalline alloy shaped piece can only rest on theoretical research stage, and industrial applications is subject to the restriction of cast ingot dimension.
(TCS) technology is solidified from consecutive solidification technical development a kind of thermal control of having got up in P.C.C company of the U.S., and it makes the freezing interface order of foundry goods advance, thus makes the cavity filling that institute's cast obtains fine and close tissue and obtains.Principle has in the formwork of heating installation outside melt is placed on, and melt bottom contacts with copper dish, and copper dish bottom is rotatable cooling pallet.When melt moves downward with copper dish, the melt in heating installation outside can instantaneous crystallization, and is still complete liquid phase in heating installation inner melt state, can solidify along with motion limit, pallet limit.But this technique can only for thin-wall part, and the thick foundry goods that reaches can not use the method.
The research that above-mentioned tradition obtains subcooling films method mainly concentrates on high undercooling and small volume subcooling films, and really obtains feather weight subcooling films, and whole melt is in supercooled state rarely has report.Because acquisition small volume subcooling films or high undercooling adopt high-frequency induction heating usually, this type of heating causes the vibration of melt because of function composite by electromagnetic stirring; When melt progressively cools to below fusing point, vibration very easily causes forming core, under Undercooling Conditions, this phenomenon is particularly serious, in order to obtain high undercooling melt, traditional terms of settlement is that this is acceptable to little quality melt (quality is several grams to tens grams) at fusing point with shangguan electricity rapid cooling.But when melt quality increases to kilogram rank, due to the restriction of heat radiation, the melt before forming core can not be approximately isothermal melt, and actual melt does not reach overall high undercooling, namely bath surface and inner condensate depression will be inconsistent, can not obtain overall subcooling films.
In sum, for superalloy, it is desirable to develop a kind ofly can obtain the temperature control method that overall melt is all in supercooled state, and the acquisition of the overall subcooling films of feather weight is the critical process of fine crystal solidification method." a kind of preparation method of feather weight subcooling films " can obtain macroscopically Uniformity of Temperature Field better, on microcosmic melt structure homogeneity is better, and volume is comparatively large and be in the melt of overall supercooled state.Subcooling films also has following characteristics: mobility is better, solid rate very low (far below 0.2%).For superalloy, through finding the literature search of prior art, not yet finding the open report being obtained feather weight subcooling films by accurate temperature controlling method, also not having corresponding patent disclosure.
Summary of the invention
For overcome exist in prior art when melt quality increases to kilogram rank, bath surface and inner condensate depression inconsistent, can not obtain the deficiency of overall subcooling films, the present invention proposes a kind of preparation method obtaining feather weight superalloy subcooling films.
Concrete steps of the present invention are:
Step one, the selection of induction power supply frequency.By conductor resistance rate ρ, conductor magnetic permeability μ, according to formula (1) and formula (2), determine supply frequency f.
△H＝d/n， (1)
In formula, n is constant; D is the diameter of heating cylinder melt, and unit is cm.The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1).
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook.
Step 2, the selection of power supply heating power.
Power supply heating power is determined according to described formula (3).
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation.
Step 3, the preparation before melting.Bottom silica tube, paving covers the B that a layer thickness is 3mm
2o
3molten glass purification agent.Cleaned superalloy raw material is put into silica tube.The thick B of one deck 3mm is covered in described superalloy ingredient upper surface
2o
3molten glass purification agent, is fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply.
Step 4, cyclical superheating process.Under intermediate frequency power supply, superalloy raw material be warming up to more than this superalloy liquidus line 100 DEG C and be incubated 5min; More than this superalloy liquidus line 50 DEG C is cooled to after insulation terminates.Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, Overheating Treatment is repeatedly carried out to superalloy raw material, obtains superalloy superheated melt.
Step 5, uniform decrease in temperature.After Overheating Treatment terminates repeatedly to superalloy raw material, with the rate of temperature fall of 1.2 ~ 0.5 DEG C/min, superalloy raw material is obtained temperature and be down to below melt liquidus line 10 DEG C, obtain feather weight subcooling films.
The present invention can obtain temperature field and melt structure homogeneity better, entirety is in the feather weight subcooling films of supercooled state, and this subcooling films mobility better, solid rate very low (far below 0.2%).
Feature of the present invention is:
The first, adopt the Intermediate Frequency Induction Heating Equipment not causing melt surface action, employing medium frequency induction power supply is heating power supply, and this intermediate frequency induction heating power supply current penetration degree of depth is deep.Meanwhile, produce convection current by Frequency Induction Heating, so make melt macro temperature field evenly, whole melt simultaneously uniform decrease in temperature can be ensured.
The second, under the type of heating limited, using high-purity silica pot as heating crucible, with B
2o
3glass melting insulating covering agent is as scavenging agent or rush argon shield.Adopt repeatedly cyclical superheating process to carry out purifying treatment to melt, the factor that can control comprises temperature of superheat, holding temperature, cycle index, and its parameter of reasonable adjusting reaches best purification effect.
3rd, by temperature programmed control conservative control rate of cooling, the melt of different volumes has its best rate of temperature fall, especially below fusing point, that joins according to melt volume arranges rate of temperature fall with calculation result, makes melt inside and outside temperature difference be limited within 3 DEG C, must whole melt uniform decrease in temperature simultaneously.
In the present invention, when Intermediate Frequency Induction Heating Equipment effect and melt, alternating electromagnetic field generated forced convection and heat effect dual function, accelerate the swimming speed (rate of diffusion increase) of atomic group, increase collision and connecting times mutually, macroscopically make Temperature Field in Melt and concentration field more even, microcosmic makes the size of melt Atom group more even with distribution, shape is more regular, finally obtains feather weight subcooling films.Along with temperature reduces further, atomic group in melt is grown up rapidly to critical nuclei size, be uniformly distributed in a large number, the atomic group of regular shape will grow up for stable crystallization nuclei, form the embryos of stable existence, thermal environment now in melt is relatively even, the existence of inducedmagnetic field adds nucleation rate, so melt occurs to solidify simultaneously, forms fine crystal solidification tissue.
The present invention highlight when supply frequency and power selection scientific and reasonable, type of heating is to the importance obtaining feather weight subcooling films, make melt under Slow cooling condition, obtain real feather weight subcooling films, better, on microcosmic melt structure homogeneity is better can to obtain macroscopically Uniformity of Temperature Field, and volume is comparatively large and be in the melt of overall supercooled state.Subcooling films also has following characteristics: mobility is better, solid rate very low (far below 0.2%).Finally obtain the solidified structure of overall evenly refinement.
The feather weight subcooling films that the present invention obtains provides slurry for thixotropic forming and rheological molding, is applicable to micro-casting field, can obtain integral fine crystal ingot casting by controlling the follow-up speed of cooling of feather weight subcooling films.
Accompanying drawing explanation
Fig. 1 is the ingot casting cross section tissue in embodiment one after melt solidifying.
Fig. 2 is the metallograph of the ingot casting in embodiment one after melt solidifying, and wherein Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c) are respectively ingot casting edge, 1/4 place and centre metallographic structure.
Fig. 3 is high-temperature alloy casting pictorial diagram in embodiment two, and wherein Fig. 3 a is the vertical view of high-temperature alloy casting, and Fig. 3 b is the side-view of high-temperature alloy casting.
Fig. 4 is the photomacrograph of superalloy ingot casting in embodiment three.
Fig. 5 is the metallograph of superalloy ingot casting in embodiment three, and wherein Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are respectively ingot casting edge, A section place, 1/4 place, centre metallographic structure in Fig. 4.
Fig. 6 is schema of the present invention.
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Embodiment one
The present embodiment a kind ofly obtains the preparation method that feather weight solid-liquid two-phase region is 30 ~ 80 DEG C of superalloy subcooling films, and described superalloy is K4169 superalloy, and the quality of this K4169 superalloy is 0.5Kg.Concrete enforcement carries out in medium frequency induction power supply, and its concrete steps are:
Step one, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook, according to formula (1) and formula (2), finally determine that intermediate frequency power supply frequency is 30KHz.
△H＝d/n， (1)
In formula, n is constant.The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1).
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook.Supply frequency f is determined according to formula (2).
The supply frequency f of melt is obtained according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Power supply heating power is determined according to described formula (3).
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation.It is as shown in table 1 that the melt obtaining different mass obtains subcooling films power supply heating power:
Table 1: the power supply heating power that different mass melt is corresponding
| Superalloy/kg | J S/(10 6A/m 2) | P/kw |
| 0.5 | 23.3 | 14.2 |
| 2 | 21.2 | 13.1 |
| 10 | 19.8 | 12.4 |
| 20 | 17.6 | 11 |
| 30 | 16 | 10 |
According to shown in table 1, the optimal power supply frequency of the present embodiment is 14.2Kw.
Step 3, the preparation before melting.Cut-off footpath is the silica tube one of Φ 35mm, high 50mm, and bottom silica tube, paving covers the B that a layer thickness is 3mm
2o
3molten glass purification agent.The K4169 superalloy raw material crossed by alcohol, acetone ultrasonic cleaning is put into silica tube.The thick B of one deck 3mm is covered in K4169 superalloy ingredient upper surface
2o
3molten glass purification agent, is finally fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply.
Step 4, cyclical superheating process.Under 30KHz intermediate frequency power supply, superalloy raw material is warming up to 1450 DEG C.After superalloy raw material is warming up to 1450 DEG C, is incubated 5min, after insulation terminates, is cooled to 1400 DEG C.Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, Overheating Treatment is repeatedly carried out to superalloy raw material, obtains superalloy superheated melt.
Step 5, uniform decrease in temperature.After Overheating Treatment terminates repeatedly to superalloy raw material, with the rate of temperature fall of 1.2 ~ 0.5 DEG C/min, superalloy raw material is obtained temperature and be down to below melt liquidus line 10 DEG C, namely 1340 DEG C, obtain feather weight subcooling films.Close induction power supply and make melt air cooling, obtain superalloy ingot casting.In the present embodiment, the rate of temperature fall of superalloy raw material is 1.2 DEG C/min, and melt liquidus line is 1350 DEG C.
Embodiment two
The specific implementation process of this example is: the present embodiment is the preparation method of the Ni-22Cr-18W-1Mo superalloy subcooling films of a kind of 2Kg.
Material involved in the present embodiment is Ni-22Cr-18W-1Mo superalloy, and Ni-22Cr-18W-1Mo superalloy is a kind of solution strengthening of independent research and the ni-base wrought superalloy of carbide dispersion-strengthened.Open in described Ni-22Cr-18W-1Mo superalloy 2009 paper people such as Bai Guanghai " Ni-22Cr-18W-1Mo based high-temperature alloy secondary M23C6 pick-up behavior ".
Step one, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook, according to formula (1) and formula (2), finally determine that intermediate frequency power supply frequency is 4KHz.
△H＝d/n， (1)
In formula, n is constant.The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1).
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook.Supply frequency f is determined according to formula (2).
The supply frequency f of melt is obtained according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Power supply heating power is determined according to described formula (3).
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation.It is as shown in table 1 that the melt obtaining different mass obtains subcooling films power supply heating power:
Table 1: the power supply heating power that different mass melt is corresponding
| Superalloy/kg | J S/(10 6A/m 2) | P/kw |
| 0.5 | 23.3 | 14.2 |
| 2 | 21.2 | 13.1 |
| 10 | 19.8 | 12.4 |
| 20 | 17.6 | 11 |
| 30 | 16 | 10 |
According to shown in table 1, the optimal power supply frequency of the present embodiment is 13.1Kw.
Step 3, the preparation before melting.Putting in quartz crucible by 2Kg Ni-22Cr-18W-1Mo system superalloy raw material, is 10 in vacuum tightness
-2lead to argon shield during Pa, start to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating process.Under 4KHz intermediate frequency power supply, superalloy raw material is warming up to 1500 DEG C.After superalloy raw material is warming up to 1450 DEG C, is incubated 10min, after insulation terminates, is cooled to 1450 DEG C.Repeat said process to heat up-insulation-cooling totally 5 times, to superalloy raw material Overheating Treatment repeatedly, obtain superalloy superheated melt.Be the infrared thermometer that temperature-controlled precision is better than 1 DEG C with temperature measuring equipment in the present embodiment, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to superalloy raw material, Overheating Treatment terminates repeatedly, adopt slow cooling, rate of temperature fall is 1.5 ~ 1.0 DEG C/min, is cooled to melt liquidus line, namely 1400 DEG C, now obtains feather weight subcooling films.Then be that to be poured into preheating temperature be in the formwork of 1000 DEG C to 5.11kg/s with pouring speed, finally obtain the physical member in embodiment two.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 DEG C/min, and melt liquidus line is 1400 DEG C.
Embodiment three
The specific implementation process of this example is: the specific implementation process of this example is: the present embodiment is the preparation method of the Ni-22Cr-18W-1Mo superalloy subcooling films of a kind of 30Kg.
Step one, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook, according to formula (1) and formula (2), finally determine that intermediate frequency power supply frequency is 400Hz.
△H＝d/n， (1)
In formula, n is constant.The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1).
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook.Supply frequency f is determined according to formula (2).
The supply frequency f of melt is obtained according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Power supply heating power is determined according to described formula (3).
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation.It is as shown in table 1 that the melt obtaining different mass obtains subcooling films power supply heating power:
Table 1: the power supply heating power that different mass melt is corresponding
| Superalloy/kg | J S/(10 6A/m 2) | P/kw |
| 0.5 | 23.3 | 14.2 |
| 2 | 21.2 | 13.1 |
| 10 | 19.8 | 12.4 |
| 20 | 17.6 | 11 |
| 30 | 16 | 10 |
According to shown in table 1, the optimal power supply frequency of the present embodiment is 10Kw.
Step 3, the preparation before melting.Putting in quartz crucible by 30Kg Ni-22Cr-18W-1Mo system superalloy raw material, is 10 in vacuum tightness
-2lead to argon shield during Pa, start to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating process.Under 400Hz intermediate frequency power supply, superalloy raw material is warming up to 1500 DEG C.After superalloy raw material is warming up to 1450 DEG C, is incubated 10min, after insulation terminates, is cooled to 1450 DEG C.Repeat said process to heat up-insulation-cooling totally 5 times, to superalloy raw material Overheating Treatment repeatedly, obtain superalloy superheated melt.Be the infrared thermometer that temperature-controlled precision is better than 1 DEG C with temperature measuring equipment in the present embodiment, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to superalloy raw material, Overheating Treatment terminates repeatedly, adopt slow cooling, rate of temperature fall is 1.5 ~ 1.0 DEG C/min, is cooled to below melt liquidus line 5 DEG C, namely 1395 DEG C, now obtains feather weight subcooling films.Then be that to be poured into preheating temperature be in the formwork of 1100 DEG C to 15.11kg/s with pouring speed, finally obtain the physical member in embodiment two.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 DEG C/min, and melt liquidus line is 1400 DEG C.
Embodiment four
The specific implementation process of this example is: the present embodiment is the preparation method of the K417 superalloy subcooling films of a kind of 20Kg.
Step one, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook, according to formula (1) and formula (2), finally determine that intermediate frequency power supply frequency is 1K Hz.
△H＝d/n， (1)
In formula, n is constant.The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1).
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook.Supply frequency f is determined according to formula (2).
The supply frequency f of melt is obtained according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Power supply heating power is determined according to described formula (3).
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation.It is as shown in table 1 that the melt obtaining different mass obtains subcooling films power supply heating power:
Table 1: the power supply heating power that different mass melt is corresponding
| Superalloy/kg | J S/(10 6A/m 2) | P/kw |
| 0.5 | 23.3 | 14.2 |
| 2 | 21.2 | 13.1 |
| 10 | 19.8 | 12.4 |
| 20 | 17.6 | 11 |
| 30 | 16 | 10 |
According to shown in table 1, the optimal power supply frequency of the present embodiment is 11Kw.
Step 3, the preparation before melting.Putting in quartz crucible by 20Kg K417 superalloy raw material, is 10 in vacuum tightness
-2lead to argon shield during Pa, start to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating process.Under 400Hz intermediate frequency power supply, superalloy raw material is warming up to 1450 DEG C.After superalloy raw material is warming up to 1400 DEG C, is incubated 10min, after insulation terminates, is cooled to 1400 DEG C.Repeat said process to heat up-insulation-cooling totally 5 times, to superalloy raw material Overheating Treatment repeatedly, obtain superalloy superheated melt.Be the infrared thermometer that temperature-controlled precision is better than 1 DEG C with temperature measuring equipment in the present embodiment, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to superalloy raw material, Overheating Treatment terminates repeatedly, adopt slow cooling, rate of temperature fall is 1.5 ~ 1.0 DEG C/min, is cooled to below melt liquidus line 5 DEG C, namely 1335 DEG C, now obtains feather weight subcooling films.Then be that to be poured into preheating temperature be in the formwork of 1100 DEG C to 10.11kg/s with pouring speed, finally obtain the physical member in embodiment two.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 DEG C/min, and melt liquidus line is 1340 DEG C.
Claims (1)
1. obtain a preparation method for feather weight superalloy subcooling films, it is characterized in that, concrete steps are:
Step one, the selection of induction power supply frequency; By conductor resistance rate ρ, conductor magnetic permeability μ, according to formula (1) and formula (2), determine supply frequency f;
△H＝d/n， (1)
In formula, n is constant; D is the diameter of heating cylinder melt, and unit is cm; The current penetration degree of depth △ H of medium frequency induction power supply is determined according to formula (1);
In formula: ρ is the resistivity of conductor, unit Wei Ω ㎝; μ is the magnetic permeability of conductor, and unit is H/cm; F is the frequency of electric current, and unit is Hz; Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to superalloy handbook;
Step 2, the selection of power supply heating power;
Power supply heating power is determined according to described formula (3);
y＝6.18exp(-x/17.32)+8.95 (3)
In formula: what y represented is power supply heating power, the unit of heating power is kw; The quality of what x represented is melt, unit is Kg; In formula (3) 6.18,17.32 and 8.95 are the constant term calculated by ANSYS software simulation;
Step 3, the preparation before melting; Bottom silica tube, paving covers the B that a layer thickness is 3mm
2o
3molten glass purification agent; Cleaned superalloy raw material is put into silica tube; The thick B of one deck 3mm is covered in described superalloy ingredient upper surface
2o
3molten glass purification agent, is fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply;
Step 4, cyclical superheating process; Under intermediate frequency power supply, superalloy raw material be warming up to more than this superalloy liquidus line 100 DEG C and be incubated 5min; More than this superalloy liquidus line 50 DEG C is cooled to after insulation terminates; Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, Overheating Treatment is repeatedly carried out to superalloy raw material, obtains superalloy superheated melt;
Step 5, uniform decrease in temperature; After Overheating Treatment terminates repeatedly to superalloy raw material, with the rate of temperature fall of 1.2 ~ 0.5 DEG C/min, superalloy raw material is obtained temperature and be down to below melt liquidus line 10 DEG C, obtain feather weight subcooling films.
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