CN103484802A - 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 PDF

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CN103484802A
CN103484802A CN201310421512.0A CN201310421512A CN103484802A CN 103484802 A CN103484802 A CN 103484802A CN 201310421512 A CN201310421512 A CN 201310421512A CN 103484802 A CN103484802 A CN 103484802A
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melt
superalloy
formula
power supply
temperature
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CN103484802B (en
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胡锐
李金山
高中堂
张铁邦
寇宏超
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Northwestern Polytechnical University
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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

A kind ofly obtain the preparation method that the feather weight superalloy is crossed the sloppy heat body
Technical field
The present invention relates to superalloy and cross the solid field of condensation, be specially a kind of preparation method that the feather weight superalloy is crossed the sloppy heat body that obtains.
Background technology
Melt treatment is as the important means of grain refining, in superalloy, be widely used, and the acquisition of crossing the sloppy heat body is the critical process that guarantees the fine crystal solidification success, can the thermal history before melt solidifying and follow-up temperature control method play most important effect to obtaining fine grained texture, by melt being carried out to special temperature control processing, can obtain crossing preferably the sloppy heat body.People have been developed the method for the thin brilliant castings of some superalloy thermal controls, and the method in industrial use 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), write " grain refining of bulk Undercooled Ni-Base Alloy " on p123-128, this article has been reported employing 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 subsequently high frequency electric source, allow the sample naturally cooling, obtained alloy Ni 77si 13b 10the tissue that is 280 ℃ in condensate depression, but homogeneity of structure is poor, and the dendrite of existing prosperity, also have tiny granular crystal; Its reason is that melt inside and outside heat radiation before forming core is inhomogeneous after cutting off the electricity supply, and could not obtain real high undercooling melt.
Patent Office of the People's Republic of China on October 12nd, 1999 has announced that (publication number: CN1232885) name is called the patent application patent of " a kind of elementide is crossed the method that the sloppy heat body solidifies ", can to cross cold metal and alloy sample directly introduce there is the same size magnitude with nucleus elementide to trigger and to control nucleation process, obtain required solidified structure.Although above method can obtain fine grained texture, due to the susceptibility of melt to composition, elementide add the performance that may affect alloy, and different alloys need to add different elementides, application is restricted.
Patent Office of the People's Republic of China on March 23rd, 2005 has announced that (publication number: CN1598005) name is called the patent application patent of " a kind of method that high undercooling melt prepares bulk nanocrystalline alloy ", realized that test button formerly solidifies under glass-coated the cooling then rapid solidification of high undercooling that reaches at a slow speed, or with rare gas element, alloy melt is blown into to heat-eliminating medium and forces in cooling metal pattern, rapid solidification obtains the bulk nanocrystalline alloy shaped piece can only rest on theoretical research stage, and industrial applications is subject to the restriction of ingot casting size.
(TCS) technology is solidified from consecutive solidification technical development a kind of thermal control of having got up in U.S. P.C.C company, and it makes the freezing interface of foundry goods sequentially advance, thereby makes watered foundry goods obtain fine and close tissue and the cavity filling obtained.Principle is to have in the formwork of heating installation outside melt is placed on, and the melt bottom contacts with the copper dish, and copper dish bottom is rotatable cooling pallet.When melt moves downward with the copper dish, can the moment crystallization at the melt of heating installation outside, and be still complete liquid phase at the inner melt state of heating installation, can solidify along with motion limit, pallet limit.But this technique can only be for thin-wall part, and the thick foundry goods that reaches can not be used the method.
The research that above-mentioned tradition obtained the sloppy heat body method mainly concentrates on high undercooling and small volume is crossed the sloppy heat body, cross the sloppy heat body and really obtain feather weight, and whole melt rarely has report in supercooled state.Because obtain, small volume is crossed the sloppy heat body or high undercooling adopts high-frequency induction heating usually, and this type of heating causes the vibration of melt because of function composite by electromagnetic stirring; When the melt Slow cooling is following to fusing point, vibration very easily causes forming core, under Undercooling Conditions, this phenomenon is particularly serious, in order to obtain the high undercooling melt, traditional terms of settlement is cold soon with the shangguan electricity at fusing point, and this is acceptable to little quality melt (quality is that several grams are to tens grams).But when melt quality increases to kilogram rank, due to the restriction of heat radiation, the melt before forming core can not be approximately the isothermal melt, and actual melt does not reach whole high undercooling, and bath surface and inner condensate depression is inconsistent, can not obtain whole sloppy heat body.
In sum, for superalloy, wish to develop and a kind ofly can obtain all temperature control methods in supercooled state of whole melt, and the whole acquisition of crossing the sloppy heat body of feather weight is the critical process of fine crystal solidification method." a kind of feather weight is crossed the preparation method of sloppy heat body " can obtain the upper Uniformity of Temperature Field of macroscopic view better, the melt structure homogeneity is better on microcosmic, the large and melt in whole supercooled state of volume.Cross the sloppy heat body and also have following characteristics: mobility is better, solid rate very low (far below 0.2%).For superalloy, through the literature search to prior art, find, not yet find to obtain by the accurate temperature controlling method the open report that feather weight is crossed the sloppy heat body, there do not is corresponding patent to announce yet.
Summary of the invention
For overcome in prior art, exist when melt quality increases to kilogram rank, bath surface and inner condensate depression inconsistent, can not obtain the whole deficiency of crossing the sloppy heat body, the present invention proposes a kind of preparation method that the feather weight superalloy is crossed the sloppy heat body that obtains.
Concrete steps of the present invention are:
Step 1, 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.Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1).
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook.
Step 2, the selection of power supply heating power.
Determine the power supply heating power according to described formula (3).
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation.
Step 3, the preparation before melting.In the silica tube bottom, paving is covered the B that a layer thickness is 3mm 2o 3the molten glass purification agent.The superalloy raw material cleaned is put into to silica tube.Cover the thick B of one deck 3mm in described superalloy ingredient upper surface 2o 3the molten glass purification agent, be fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply.
Step 4, cyclical superheating is processed.The superalloy raw material is warming up to these more than superalloy liquidus line 100 ℃ and be incubated 5min under intermediate frequency power supply; Insulation is cooled to above 50 ℃ of this superalloy liquidus line after finishing.Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, the superalloy raw material is carried out to Overheating Treatment repeatedly, obtain the superalloy superheated melt.
Step 5, uniform decrease in temperature.After to the superalloy raw material, Overheating Treatment finishes repeatedly, with the rate of temperature fall of 1.2～0.5 ℃/min, the superalloy raw material is obtained to temperature and be down to below the melt liquidus line 10 ℃, obtain feather weight and cross the sloppy heat body.
The present invention can obtain temperature field and the melt structure homogeneity is better, integral body is crossed the sloppy heat body in the feather weight of supercooled state, and this crosses, and the sloppy heat liquid flowability is better, solid rate very low (far below 0.2%).
Characteristics of the present invention are:
The first, adopt the Intermediate Frequency Induction Heating Equipment that does not cause the melt surface action, the employing medium frequency induction power supply is heating power supply, this intermediate frequency induction heating power supply electric current depth of penetration is deep.Simultaneously, by Frequency Induction Heating, produce convection current, and then make the melt macro temperature field more even, can guarantee whole melt uniform decrease in temperature simultaneously.
The second, under the type of heating limited, using high-purity silica pot as heating crucible, with B 2o 3the glass melting insulating covering agent is as scavenging agent or rush argon shield.Adopt repeatedly cyclical superheating to process melt is carried out to purifying treatment, the factor that can control comprises temperature of superheat, holding temperature, cycle index, rationally regulates its parameter and reaches the best purification effect.
The 3rd, rationally control rate of cooling by temperature programmed control, the melt of different volumes has its best rate of temperature fall, especially below fusing point, that according to melt volume, joins arranges rate of temperature fall with calculation result, and the melt inside and outside temperature difference is limited in 3 ℃, must whole melt while uniform decrease in temperature.
In the present invention, when Intermediate Frequency Induction Heating Equipment effect and melt, alternating electromagnetic field generated forced convection and heat effect dual function, accelerated the swimming speed (rate of diffusion increase) of atom group, increase collision and connecting times mutually, on macroscopic view, make Temperature Field in Melt and concentration field more even, make the size of melt Atom group on microcosmic and distribute more even, shape is more regular, finally obtains feather weight and crosses the sloppy heat body.Along with temperature further reduces, atom group in melt grows up rapidly to the critical nuclei size, be uniformly distributed in a large number, the atom group of regular shape will grow up for stable crystallization nuclei, form the embryos of stable existence, now the thermal environment in melt is relatively even, the existence of inducedmagnetic field has increased nucleation rate, so melt occurs to solidify simultaneously, forms the fine crystal solidification tissue.
The present invention has given prominence in the situation that supply frequency and power selection are scientific and reasonable, type of heating is crossed the importance of sloppy heat body to obtaining feather weight, make melt obtain real feather weight under the Slow cooling condition and cross the sloppy heat body, can obtain the upper Uniformity of Temperature Field of macroscopic view better, the melt structure homogeneity is better on microcosmic, the large and melt in whole supercooled state of volume.Cross the sloppy heat body and also have following characteristics: mobility is better, solid rate very low (far below 0.2%).Finally obtained the solidified structure of whole even refinement.
The feather weight that the present invention obtains is crossed the sloppy heat body and is provided slurry for thixotropic forming and rheological molding, is applicable to micro-casting field, by controlling feather weight, crosses the follow-up speed of cooling of sloppy heat body and can obtain the integral fine crystal ingot casting.
The accompanying drawing explanation
Fig. 1 is the ingot casting cross section tissue after melt solidifying in embodiment mono-.
The metallograph that Fig. 2 is the ingot casting after melt solidifying in embodiment mono-, 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 bis-, 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.
The photomacrograph that Fig. 4 is superalloy ingot casting in embodiment tri-.
The metallograph that Fig. 5 is superalloy ingot casting in embodiment tri-, 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 mono-
The present embodiment is that a kind of feather weight solid-liquid two-phase region that obtains is the preparation method that 30～80 ℃ of superalloys are crossed the sloppy heat body, and described superalloy is the K4169 superalloy, and the quality of this K4169 superalloy is 0.5Kg.Concrete enforcement is to carry out in medium frequency induction power supply, and its concrete steps are:
Step 1, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook, according to formula (1) and formula (2), finally determine that the intermediate frequency power supply frequency is 30KHz.
△H=d/n， （1）
In formula, n is constant.Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1).
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook.Determine supply frequency f according to formula (2).
Obtain the supply frequency f of melt according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Determine the power supply heating power according to described formula (3).
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation.It is as shown in table 1 that the melt that obtains different mass must be sloppy heat body power supply heating power:
Table 1: the power supply heating power that the 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.One of the silica tube that the cut-off footpath is Φ 35mm, high 50mm, in the silica tube bottom, paving is covered the B that a layer thickness is 3mm 2o 3the molten glass purification agent.The K4169 superalloy raw material that to cross by alcohol, acetone ultrasonic cleaning is put into silica tube.Cover the thick B of one deck 3mm in K4169 superalloy ingredient upper surface 2o 3the molten glass purification agent, finally be fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply.
Step 4, cyclical superheating is processed.Under the 30KHz intermediate frequency power supply, the superalloy raw material is warming up to 1450 ℃.After the superalloy raw material is warming up to 1450 ℃ and be incubated 5min, insulation is cooled to 1400 ℃ after finishing.Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, the superalloy raw material is carried out to Overheating Treatment repeatedly, obtain the superalloy superheated melt.
Step 5, uniform decrease in temperature.After to the superalloy raw material, Overheating Treatment finishes repeatedly, with the rate of temperature fall of 1.2～0.5 ℃/min, the superalloy raw material is obtained to temperature and be down to below the melt liquidus line 10 ℃, 1340 ℃, obtain feather weight and cross the sloppy heat body.Close induction power supply and make the melt air cooling, obtain the superalloy ingot casting.In the present embodiment, the rate of temperature fall of superalloy raw material is 1.2 ℃/min, and the melt liquidus line is 1350 ℃.
Embodiment bis-
The specific implementation process of this example is: the present embodiment is the preparation method that the Ni-22Cr-18W-1Mo superalloy of a kind of 2Kg is crossed the sloppy heat body.
In the present embodiment, related material is the Ni-22Cr-18W-1Mo superalloy, and the 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 separates out behavior ".
Step 1, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook, according to formula (1) and formula (2), finally determine that the intermediate frequency power supply frequency is 4KHz.
△H=d/n， （1）
In formula, n is constant.Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1).
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook.Determine supply frequency f according to formula (2).
Obtain the supply frequency f of melt according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Determine the power supply heating power according to described formula (3).
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation.It is as shown in table 1 that the melt that obtains different mass must be sloppy heat body power supply heating power:
Table 1: the power supply heating power that the 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.By 2Kg Ni-22Cr-18W-1Mo, being that the superalloy raw material is put in quartz crucible, is 10 in vacuum tightness -2during Pa, logical argon shield starts to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating is processed.Under the 4KHz intermediate frequency power supply, the superalloy raw material is warming up to 1500 ℃.After the superalloy raw material is warming up to 1450 ℃ and be incubated 10min, insulation is cooled to 1450 ℃ after finishing.Heat up-insulation-the cooling totally 5 times that repeats said process, to superalloy raw material Overheating Treatment repeatedly, obtain the superalloy superheated melt.In the present embodiment, with temperature measuring equipment, be that temperature-controlled precision is better than the infrared thermometer of 1 ℃, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to the superalloy raw material, Overheating Treatment finishes repeatedly, adopt slow cooling, rate of temperature fall is 1.5～1.0 ℃/min, is cooled to the melt liquidus line, 1400 ℃, now obtains feather weight and crosses the sloppy heat body.Then take pouring speed as 5.11kg/s is poured into preheating temperature in the formwork of 1000 ℃, finally obtain the physical member in embodiment bis-.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 ℃/min, and the melt liquidus line is 1400 ℃.
Embodiment tri-
The specific implementation process of this example is: the specific implementation process of this example is: the present embodiment is the preparation method that the Ni-22Cr-18W-1Mo superalloy of a kind of 30Kg is crossed the sloppy heat body.
Step 1, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook, according to formula (1) and formula (2), finally determine that the intermediate frequency power supply frequency is 400Hz.
△H=d/n， （1）
In formula, n is constant.Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1).
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook.Determine supply frequency f according to formula (2).
Obtain the supply frequency f of melt according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Determine the power supply heating power according to described formula (3).
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation.It is as shown in table 1 that the melt that obtains different mass must be sloppy heat body power supply heating power:
Table 1: the power supply heating power that the 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.By 30Kg Ni-22Cr-18W-1Mo, being that the superalloy raw material is put in quartz crucible, is 10 in vacuum tightness -2during Pa, logical argon shield starts to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating is processed.Under the 400Hz intermediate frequency power supply, the superalloy raw material is warming up to 1500 ℃.After the superalloy raw material is warming up to 1450 ℃ and be incubated 10min, insulation is cooled to 1450 ℃ after finishing.Heat up-insulation-the cooling totally 5 times that repeats said process, to superalloy raw material Overheating Treatment repeatedly, obtain the superalloy superheated melt.In the present embodiment, with temperature measuring equipment, be that temperature-controlled precision is better than the infrared thermometer of 1 ℃, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to the superalloy raw material, Overheating Treatment finishes repeatedly, adopt slow cooling, rate of temperature fall is 1.5～1.0 ℃/min, is cooled to following 5 ℃ of melt liquidus line, 1395 ℃, now obtains feather weight and crosses the sloppy heat body.Then take pouring speed as 15.11kg/s is poured into preheating temperature in the formwork of 1100 ℃, finally obtain the physical member in embodiment bis-.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 ℃/min, and the melt liquidus line is 1400 ℃.
Embodiment tetra-
The specific implementation process of this example is: the present embodiment is the preparation method that the K417 superalloy of a kind of 20Kg is crossed the sloppy heat body.
Step 1, the selection of induction power supply frequency.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook, according to formula (1) and formula (2), finally determine that the intermediate frequency power supply frequency is 1K Hz.
△H=d/n， （1）
In formula, n is constant.Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1).
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz.Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook.Determine supply frequency f according to formula (2).
Obtain the supply frequency f of melt according to described formula (1) and formula (2).
Step 2, the selection of power supply heating power.
Determine the power supply heating power according to described formula (3).
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation.It is as shown in table 1 that the melt that obtains different mass must be sloppy heat body power supply heating power:
Table 1: the power supply heating power that the 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.20Kg K417 superalloy raw material is put in quartz crucible, is 10 in vacuum tightness -2during Pa, logical argon shield starts to do Overheating Treatment when the pressure of argon gas is 0.5Pa.
Step 4, cyclical superheating is processed.Under the 400Hz intermediate frequency power supply, the superalloy raw material is warming up to 1450 ℃.After the superalloy raw material is warming up to 1400 ℃ and be incubated 10min, insulation is cooled to 1400 ℃ after finishing.Heat up-insulation-the cooling totally 5 times that repeats said process, to superalloy raw material Overheating Treatment repeatedly, obtain the superalloy superheated melt.In the present embodiment, with temperature measuring equipment, be that temperature-controlled precision is better than the infrared thermometer of 1 ℃, the speed of response is less than 10ms.
Step 5, uniform decrease in temperature.After to the superalloy raw material, Overheating Treatment finishes repeatedly, adopt slow cooling, rate of temperature fall is 1.5～1.0 ℃/min, is cooled to following 5 ℃ of melt liquidus line, 1335 ℃, now obtains feather weight and crosses the sloppy heat body.Then take pouring speed as 10.11kg/s is poured into preheating temperature in the formwork of 1100 ℃, finally obtain the physical member in embodiment bis-.In the present embodiment, the rate of temperature fall of superalloy melt is 1.5 ℃/min, and the melt liquidus line is 1340 ℃.

Claims (1)

1. one kind obtains the preparation method that the feather weight superalloy is crossed the sloppy heat body, it is characterized in that, concrete steps are:
Step 1, 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; Determine the electric current depth of penetration △ H of medium frequency induction power supply according to formula (1);
f = ρ μ ( 5030 ΔH ) 2 - - - ( 2 )
In formula: the resistivity that ρ is conductor, the Wei Ω ㎝ of unit; The magnetic permeability that μ is conductor, unit is H/cm; The frequency that f is electric current, unit is Hz; Described conductor resistance rate ρ, conductor magnetic permeability μ all check according to the superalloy handbook;
Step 2, the selection of power supply heating power;
Determine the power supply heating power according to described formula (3);
y=6.18exp(-x/17.32)+8.95 （3）
In formula: what y meaned is the power supply heating power, and the unit of heating power is kw; What x meaned is the quality of melt, and unit is Kg; In formula (3) 6.18,17.32 and 8.95 is the constant term calculated by the ANSYS software simulation;
Step 3, the preparation before melting; In the silica tube bottom, paving is covered the B that a layer thickness is 3mm 2o 3the molten glass purification agent; The superalloy raw material cleaned is put into to silica tube; Cover the thick B of one deck 3mm in described superalloy ingredient upper surface 2o 3the molten glass purification agent, be fixed on silica tube on the ruhmkorff coil of medium frequency induction power supply;
Step 4, cyclical superheating is processed; The superalloy raw material is warming up to these more than superalloy liquidus line 100 ℃ and be incubated 5min under intermediate frequency power supply; Insulation is cooled to above 50 ℃ of this superalloy liquidus line after finishing; Repeat above-mentioned intensification-insulation-temperature-fall period totally 5 times, the superalloy raw material is carried out to Overheating Treatment repeatedly, obtain the superalloy superheated melt;
Step 5, uniform decrease in temperature; After to the superalloy raw material, Overheating Treatment finishes repeatedly, with the rate of temperature fall of 1.2～0.5 ℃/min, the superalloy raw material is obtained to temperature and be down to below the melt liquidus line 10 ℃, obtain feather weight and cross the sloppy heat body.
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* Cited by examiner, † Cited by third party
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CN107245591A (en) * 2017-06-30 2017-10-13 合肥博创机械制造有限公司 A kind of manufacture method of corrosion resisting alloy applied to plant equipment
CN113881910A (en) * 2021-10-28 2022-01-04 西北工业大学 Method for regulating immiscible alloy structure by using strong magnetic field

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CN103131980A (en) * 2013-03-12 2013-06-05 西北工业大学 Method for realizing fine crystal solidification by controlling spherical crystal stabilization

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JPS5983717A (en) * 1982-11-03 1984-05-15 Ishikawajima Harima Heavy Ind Co Ltd Heat treatment of build-up welded part
JP2003172150A (en) * 2001-12-03 2003-06-20 Toshiba Corp Softening heat treatment method for gas turbine blade
CN103131980A (en) * 2013-03-12 2013-06-05 西北工业大学 Method for realizing fine crystal solidification by controlling spherical crystal stabilization

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CN107245591A (en) * 2017-06-30 2017-10-13 合肥博创机械制造有限公司 A kind of manufacture method of corrosion resisting alloy applied to plant equipment
CN113881910A (en) * 2021-10-28 2022-01-04 西北工业大学 Method for regulating immiscible alloy structure by using strong magnetic field
CN113881910B (en) * 2021-10-28 2022-07-29 西北工业大学 Method for regulating immiscible alloy structure by using strong magnetic field

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