CN101717865A - Method for melting nickel-base high-temperature return material K441alloy - Google Patents
Method for melting nickel-base high-temperature return material K441alloy Download PDFInfo
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Abstract
The invention relates to a method for melting nickel-base high-temperature return material K441 alloy, comprising the following steps: refining the return material and/or waste cast pieces in a vacuum induction furnace, decreasing the temperature of molten alloy and casting the molten alloy into a primary material ingot, analyzing the chemical components of the primary material ingot and adjusting the components of the molten alloy by adopting the nickel, aluminum, tungsten, chromium, molybdenum, zirconium, chromium boron master alloy and/or the carbon as the adjusting element component material; refining the primary material ingot and the nickel, the tungsten, the chromium and/or the molybdenum in the adjusting element component material for the second time and heating to cast the molten alloy after a film forming on the molten alloy or adding the carbon, aluminum, chromium boron master alloy and/or the zirconium to the molten alloy to alloy and heating to cast the molten alloy into an alloy ingot after a film forming on the molten alloy. The qualification rate of the return material K441 alloy produced with the method is equal to the qualification rate of the cast piece produced from the new material, and the initial melting temperature of the return material K441 alloy is higher than the initial melting temperature of the alloy produced from the new material with the original production technology.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of alloy melting method of nickel base superalloy K441 returns.
Background technology
The K441 alloy is a kind of engine turning vane material, and the outstanding feature of this alloy is that carbon content is low, and Cr, W content are higher; Has higher initial melting temperature, the instantaneous performance of good ultrahigh-temperature, and cold-and-heat resistent fatigue property preferably.Previous experiments shows that under the carbon content condition with higher, the blade crack problem in the alloy casting process is more serious, and by technological improvement, the blade qualification rate of alloy cast has now reached about 60%, and performance can satisfy the production needs.This alloy can replace the blade manufacturing that the X40 alloy is used for aircraft engine, and can further expand and be applied in other combustion machines.In the production process of this foundry goods, the alloy liquation more than 60% as the returns of pouring and riser systems, and can produce a part of waste casting, the utilization ratio of alloy only is 20～30%, cause the waste in the production process, especially the Ni in the superalloy, Cr, W, Mo etc. belong to the rare expensive metal of country.The K441 alloy is under the scale of application condition of enlarged, and the application of returns has become the task of top priority.
Summary of the invention
At above-mentioned technical problem, the invention provides a kind of alloy melting method of nickel base superalloy K441 returns, purpose is to be prepared into the K441 alloy that can be used in preparation engine turning vane by with returns or waste casting melting again.
Method of the present invention is carried out according to the following steps:
1, obtain a defective material ingot:
Returns that produce when nickel base superalloy K441 is prepared blade and/or waste casting carry out blast to be handled, the surface-conditioning of returns and/or waste casting is clean, place vacuum induction furnace then, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, send the electrofusion alloy, control vacuum tightness≤10.66Pa in the alloy melting process; The alloy liquation is warming up to 1590～1650 ℃ carries out refining, refining time is 20～40min, controls vacuum tightness≤1.33Pa in the refining process, and refining is cooled to alloy molten surface conjunctiva after finishing.The alloy liquation of conjunctiva is heated to 1500～1580 ℃, pours into a defective material ingot.
2, prepare secondary refining:
Analyze the chemical ingredients of a defective material ingot, when the composition of a defective material ingot by weight percentage at Al 3.30～3.90%, W11.8～14.0%, Cr 15.2～16.5%, and Mo 1.2～2.55%, and Zr 0.01～0.03%, B 0.006～0.008%, C 0.02～0.035%, and surplus is in the scope of Ni the time, prepares to carry out secondary refining; When Al, W in the defective material ingot, Cr, Mo, Zr, B and/or C composition exceed above-mentioned scope, adopt nickel, aluminium, tungsten, chromium, molybdenum, zirconium, chromium boron master alloy and/or carbon as regulating the elemental composition materials, make the composition of respectively regulating elemental composition materials and the mixed whole materials of a defective material ingot meet the mentioned component scope.
3, secondary refining:
When not needing to regulate nickel in the defective material ingot composition, tungsten, chromium and/or molybdenum composition, one defective material ingot is placed vacuum induction furnace, starting vacuum apparatus vacuumizes, as vacuum tightness≤1.33Pa, the secondary refining refining ℃ is carried out in feeding temperature-raising to 1590～1650, requires vacuum tightness≤10.66Pa in the alloy melting process, and the secondary refining time is 20～40min, control vacuum tightness≤1.33Pa in the refining process, secondary refining is cooled to alloy molten surface conjunctiva after finishing.When needs are regulated nickel in the defective material ingot, tungsten, chromium and/or molybdenum composition, one defective material ingot and nickel, tungsten, chromium and/or the molybdenum regulated in the elemental composition materials are placed vacuum induction furnace, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, secondary refining ℃ carries out in feeding temperature-raising to 1590～1650, require vacuum tightness≤10.66Pa in the alloy melting process, the secondary refining time is 20～40min; Refining is cooled to alloy molten surface conjunctiva after finishing; When needs are regulated carbon in the defective material ingot, aluminium, boron and/or zirconium, the alloy liquation of conjunctiva behind the secondary refining is heated to conjunctiva to be melted fully, under vacuum condition, carry out alloying, control vacuum tightness≤1.33Pa, and carbon, aluminium, chromium boron master alloy and/or zirconium in the elemental composition materials are regulated in adding, insulation 5～10min is cooled to alloy molten surface conjunctiva.
4, obtain the K441 alloy:
When not needing to regulate carbon in the defective material ingot composition, aluminium, boron and zirconium in the step 3, the alloy liquation that secondary refining in the step 3 is finished the back conjunctiva is heated to 1500～1580 ℃, controls vacuum tightness≤1.33Pa in the heat-processed, pours into the K441 alloy pig then.When needing to regulate carbon in the defective material ingot composition, aluminium, boron and/or zirconium in the step 3, the alloy liquation of conjunctiva after step 3 interalloyization is heated to 1500～1580 ℃ of conjunctivas, control vacuum tightness≤1.33Pa in the heat-processed, pour into the K441 alloy pig then.
Temperature when being cooled to conjunctiva in the aforesaid method is 1400 ± 20 ℃.
Experiment shows, when the carbon content in the K441 alloy surpasses specialized range, the casting manufacturability of alloy reduces significantly, therefore the consumption of carbon deoxidation in carbon content and the fusion process in the alloy is the parameter that needs emphasis control in the decision fusion process, and the present invention adopts the high temperature purifying method, under 1590～1650 ℃ of conditions, carry out melting, purpose is the carbon content that reduces in the alloy, and is controlled in 0.02～0.035% the scope, by high melt impurity is got rid of simultaneously; Add the method for easy scaling loss element in addition by repeatedly melting and segmentation, help control element content in the scope of standard-required.
Show through overtesting production, the returns K441 alloy that adopts aforesaid method to obtain can satisfy production requirement fully, suitable with these returns K441 alloy-steel casting with the casting qualified rate that adopts the virgin material preparation, and various performance parameters is close, adopt the DSC method to record the initial melting temperature that returns K441 alloy prepares foundry goods and can reach more than 1324 ℃, be higher than the initial melting temperature that the original production technology adopts the foundry goods of virgin material preparation.
Embodiment
The weight purity of adding elemental nickel, aluminium, tungsten, chromium, molybdenum, zirconium, chromium boron master alloy and carbon that adopts in the embodiment of the invention is respectively Ni in the metallic nickel 〉=99.9%, Al in the metallic aluminium 〉=99.9%, W in the tungsten 〉=99.9%, Mo in the metal molybdenum 〉=99.9%, Zr in the metal zirconium 〉=99.4%, B content 〉=12% in the chromium boron master alloy, C in the carbon 〉=99.5%.
The dead head of the generation the when returns that adopt in the embodiment of the invention prepare blade for nickel base superalloy K441, running channel part returns.
The waste casting of the generation the when waste casting that adopts in the embodiment of the invention prepares blade for nickel base superalloy K441.
Embodiment 1
Returns that produce when nickel base superalloy K441 is prepared blade and waste casting carry out blast to be handled, the surface-conditioning of returns and waste casting is clean, placing vacuum induction furnace to start vacuum apparatus then simultaneously vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1650 ℃, refining 20min controls vacuum tightness≤10.66Pa in its interalloy liquation melting process, controls vacuum tightness≤1.33Pa in the refining process; Refining is cooled to alloy molten surface conjunctiva after finishing.The alloy liquation of conjunctiva is heated to 1540 ℃, pours into a defective material ingot.
The chemical ingredients of analyzing a defective material ingot is Al 3.68% by weight percentage, and W 12.10%, Cr15.56%, and Mo 1.88%, and Zr 0.019%, and B 0.0066%, C0.031%, surplus is Ni.The composition range that all is positioned at requirement according to this chemical ingredients need not add adjusting composition element material.
One defective material ingot is placed vacuum induction furnace, start vacuum apparatus and vacuumize, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1650 ℃ carries out secondary refining, require vacuum tightness≤10.66Pa in the alloy liquation melting process, refining 30min controls vacuum tightness≤1.33Pa in the refining process; Refining is cooled to alloy molten surface conjunctiva after finishing.
The alloy liquation that secondary refining is finished the back conjunctiva is heated to 1500 ℃, controls vacuum tightness≤1.33Pa in the heat-processed, pours into returns K441 alloy pig then.
The returns K441 alloy pig that obtains is carried out the initial melting temperature test, and initial melting temperature is 1324 ℃, is higher than the alloy initial melting temperature of virgin material preparation.Determining returns K441 alloy pig performance perameter is respectively: tensile strength 870MPa under the room temperature condition, and yield strength 720MPa, relative reduction in area is 16.7%.Tensile strength 555MPa under 900 ℃ of hot conditionss, yield strength 422MPa, relative reduction in area is that be 42h the creep rupture life under 15.0%, 980 ℃, 83MPa condition.Adopt the performance perameter of the K441 alloy of virgin material preparation to be respectively, tensile strength 760MPa under the room temperature condition, yield strength 675MPa, relative reduction in area is 12.5%.Tensile strength 540MPa under 900 ℃ of hot conditionss, yield strength 450MPa, relative reduction in area is that be 38h the creep rupture life under 5.0%, 980 ℃, 83MPa condition.This alloy at 980 ℃, 83MPa condition following creep rupture life of standard-required is 〉=18h.
Embodiment 2
The returns that produce when nickel base superalloy K441 is prepared blade carry out blast to be handled, the surface-conditioning of returns is clean, placing vacuum induction furnace to start vacuum apparatus then vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1620 ℃ refining, require vacuum tightness≤10.66Pa in its interalloy liquation melting process, refining 30min controls vacuum tightness≤1.33Pa in the refining process; After finishing, the refining refining is cooled to alloy molten surface conjunctiva.The alloy liquation of conjunctiva is heated to 1580 ℃ pours into a defective material ingot.
The chemical ingredients of analyzing a defective material ingot is Al 3.64% by weight percentage, and W 11.48%, and Cr 15.30%, and Mo 1.78%, and Zr 0.023%, and B 0.009%, C0.025%, and surplus is Ni.According to this chemical ingredients as seen, W and B need to adjust composition and add adjusting elemental composition materials all above composition range.Prepare the adjusting elemental composition materials of nickel, aluminium, tungsten, chromium, molybdenum, zirconium, boron-chromium alloy and carbon, at first regulate the element that content in proportion has more the specialized range maximum in the regulate process, and proportionally content is regulated by the few order of as many as, making the composition in total material of each a standby material and a defective material ingot is Al 3.55%, W13.0%, and Cr 16.0%, Mo 1.90%, Zr 0.02%, and C 0.025%, and B 0.007%.
Ni, W, Mo, Cr in the adjusting materials of one defective material ingot and above-mentioned preparation are placed vacuum induction furnace, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1620 ℃ carries out secondary refining, require vacuum tightness≤10.66Pa in the alloy liquation melting process, the secondary refining time is 20min, vacuum tightness≤1.33Pa during refining; Secondary refining is cooled to alloy molten surface conjunctiva after finishing.
The alloy liquation of conjunctiva is heated to conjunctiva to be melted fully and carries out alloying, require vacuum tightness≤1.33Pa, and add carbon, aluminium, chromium boron master alloy and the zirconium of regulating in the composition materials, and add the back and under the state that conjunctiva melts fully, be incubated 10min, be cooled to the alloy surface conjunctiva then.
The alloy liquation of conjunctiva after the alloying is heated to 1580 ℃, controls vacuum tightness≤1.33Pa in the heat-processed, pour into returns K441 alloy pig then.
The returns K441 alloy that obtains is carried out the initial melting temperature test, and initial melting temperature is 1328 ℃, is higher than virgin material alloy initial melting temperature.Determining returns K441 alloy property parameter is respectively: tensile strength 930MPa under the room temperature condition, and yield strength 735MPa, relative reduction in area is 19.5%.Tensile strength 580MPa under 900 ℃ of hot conditionss, yield strength 465MPa, relative reduction in area is that be 38h the creep rupture life under 8.0%, 980 ℃, 83MPa condition.The performance perameter of virgin material K441 alloy is respectively, tensile strength 760MPa under the room temperature condition, and yield strength 675MPa, relative reduction in area is 12.5%.Tensile strength 540MPa under 900 ℃ of hot conditionss, yield strength 450MPa, relative reduction in area is that be 38h the creep rupture life under 5.0%, 980 ℃, 83MPa condition.This alloy at 980 ℃, 83MPa condition following creep rupture life of standard-required is 〉=18h.
Embodiment 3
The waste casting that produces when nickel base superalloy K441 is prepared blade carries out blast to be handled, the surface-conditioning of waste casting is clean, placing vacuum induction furnace to start vacuum apparatus then vacuumizes, as vacuum tightness≤1.33Pa, feeding temperature-raising to 1590 ℃, refining 40min controls vacuum tightness≤10.66Pa in its interalloy liquation melting process, controls vacuum tightness≤1.33Pa in the refining process; After finishing, the refining refining is cooled to alloy molten surface conjunctiva.The alloy liquation of conjunctiva is heated to 1500 ℃, pours into a defective material ingot.
The chemical ingredients of analyzing a defective material ingot is Al 3.68% by weight percentage, and W 11.48%, and Cr 15.60%, and Mo 1.78%, and Zr 0.023%, and B 0.0075%, C0.027%, and surplus is Ni.According to this chemical ingredients as seen, W surpasses composition range, needs to adjust to add to regulate the composition materials.Prepare the W elements material as regulating the composition materials, make that the W weight content is 13% in tungsten and the total material of a defective material ingot, calculating other composition weight percents as can be known is Al 3.62%, W 13.0%, and Cr 15.36%, Mo1.75%, Zr 0.022%, and B 0.0072%, and C 0.0265%; Each composition is in claimed range.
The tungsten of one defective material ingot and preparation is regulated material place vacuum induction furnace, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1590 ℃ carries out secondary refining, require vacuum tightness≤10.66Pa in the alloy liquation melting process, the secondary refining time is 40min, vacuum tightness≤1.33Pa during refining; Secondary refining is cooled to alloy molten surface conjunctiva after finishing.
Conjunctiva alloy liquation behind the secondary refining is heated to 1550 ℃, and control vacuum tightness≤1.33Pa pours into returns K441 alloy pig then.
The returns K441 alloy that obtains is carried out the initial melting temperature test, and initial melting temperature is 1330 ℃, is higher than virgin material alloy initial melting temperature.Determining returns K441 alloy property parameter is respectively: tensile strength 785MPa under the room temperature condition, and yield strength 680MPa, relative reduction in area is 22%.Tensile strength 570MPa under 900 ℃ of hot conditionss, yield strength 540MPa, relative reduction in area is that be 261.4h the creep rupture life under 15.5%, 980 ℃, 83MPa condition.The performance perameter of virgin material K441 alloy is respectively, tensile strength 760MPa under the room temperature condition, and yield strength 675MPa, relative reduction in area is 12.5%.Tensile strength 540MPa under 900 ℃ of hot conditionss, yield strength 450MPa, relative reduction in area is that be 38h the creep rupture life under 5.0%, 980 ℃, 83MPa condition.This alloy at 980 ℃, 83MPa condition following creep rupture life of standard-required is 〉=18h.
Embodiment 4
The returns that produce when nickel base superalloy K441 is prepared blade carry out blast to be handled, the surface-conditioning of returns is clean, placing vacuum induction furnace to start vacuum apparatus then vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1600 ℃ refining, require vacuum tightness≤10.66Pa in its interalloy liquation melting process, refining 25min controls vacuum tightness≤1.33Pa in the refining process; After finishing, the refining refining is cooled to alloy molten surface conjunctiva.The alloy liquation of conjunctiva is heated to 1520 ℃ pours into a defective material ingot.
The chemical ingredients of analyzing a defective material ingot is Al 3.2% by weight percentage, and W 12.50%, and Cr 15.10%, and Mo 1.78%, and Zr 0.023%, and B 0.0073%, C0.025%, and surplus is Ni.According to this chemical ingredients as seen, Cr and Al need to adjust composition and add adjusting elemental composition materials all above composition range.Prepare the adjusting elemental composition materials of aluminium, chromium, making the composition in total material of each a standby material and a defective material ingot after the adjustment is Al 3.55%, Cr 16.0%, W 12.34%, and Mo 1.76%, and Zr 0.023%, and C 0.0247%, and B 0.0072%.
Cr in the adjusting materials of one defective material ingot and above-mentioned preparation is placed vacuum induction furnace, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1605 ℃ carries out secondary refining, require vacuum tightness≤10.66Pa in the alloy liquation melting process, the secondary refining time is 25min, vacuum tightness≤1.33Pa during refining; Secondary refining is cooled to alloy molten surface conjunctiva after finishing.
The alloy liquation of conjunctiva is heated to conjunctiva melts fully and carry out alloying, require vacuum tightness≤1.33Pa, and add the aluminium of regulating in the composition materials, add the back and under the state that conjunctiva melts fully, is incubated 5min, be cooled to the alloy surface conjunctiva then.
The alloy liquation of conjunctiva after the alloying is heated to 1530 ℃, controls vacuum tightness≤1.33Pa in the heat-processed, pour into returns K441 alloy pig then.
The returns K441 alloy that obtains is carried out the initial melting temperature test, and initial melting temperature is 1332 ℃, is higher than virgin material alloy initial melting temperature.Determining returns K441 alloy property parameter is respectively: tensile strength 825MPa under the room temperature condition, and yield strength 710MPa, relative reduction in area is 23%.Tensile strength 610MPa under 900 ℃ of hot conditionss, yield strength 468MPa, relative reduction in area is that be 23.49h the creep rupture life under 9.0%, 980 ℃, 83MPa condition.The performance perameter of virgin material K441 alloy is respectively, tensile strength 760MPa under the room temperature condition, and yield strength 675MPa, relative reduction in area is 12.5%.Tensile strength 540MPa under 900 ℃ of hot conditionss, yield strength 450MPa, relative reduction in area is that be 38h the creep rupture life under 5.0%, 980 ℃, 83MPa condition.This alloy at 980 ℃, 83MPa condition following creep rupture life of standard-required is 〉=18h.
Embodiment 5
The returns that produce when nickel base superalloy K441 is prepared blade carry out blast to be handled, the surface-conditioning of returns is clean, placing vacuum induction furnace to start vacuum apparatus then vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1640 ℃ refining, require vacuum tightness≤10.66Pa in its interalloy liquation melting process, refining 35min controls vacuum tightness≤1.33Pa in the refining process; After finishing, the refining refining is cooled to alloy molten surface conjunctiva.The alloy liquation of conjunctiva is heated to 1560 ℃ pours into a defective material ingot.
The chemical ingredients of analyzing a defective material ingot is Al 3.64% by weight percentage, and W 13.2%, and Cr 14.90%, and Mo 1.08%, and Zr 0.009%, and B 0.0075%, C0.018%, and surplus is Ni.According to this chemical ingredients as seen, Mo, Cr, Zr, C need to adjust composition and add adjusting elemental composition materials all above composition range.Prepare the adjusting elemental composition materials of molybdenum, zirconium and carbon, making the composition in total material of each a standby material and a defective material ingot after the adjustment is Mo 1.90%, and C 0.025%, Cr16.0%, and Zr0.02%, W 12.94%, and B 0.0074%.
Mo, Cr in the adjusting materials of one defective material ingot and above-mentioned preparation are placed vacuum induction furnace, starting vacuum apparatus vacuumizes, when vacuum tightness≤1.33Pa, feeding temperature-raising to 1635 ℃ carries out secondary refining, require vacuum tightness≤10.66Pa in the alloy liquation melting process, the secondary refining time is 35min, vacuum tightness≤1.33Pa during refining; Secondary refining is cooled to alloy molten surface conjunctiva after finishing.
The alloy liquation of conjunctiva is heated to conjunctiva melts fully and carry out alloying, require vacuum tightness≤1.33Pa, and add carbon, the zirconium of regulating in the composition materials, add the back and under the state that conjunctiva melts fully, is incubated 7min, be cooled to the alloy surface conjunctiva then.
The alloy liquation of conjunctiva after the alloying is heated to 1560 ℃, controls vacuum tightness≤1.33Pa in the heat-processed, pour into returns K441 alloy pig then.
The returns K441 alloy that obtains is carried out the initial melting temperature test, and initial melting temperature is 1329 ℃, is higher than virgin material alloy initial melting temperature.Determining returns K441 alloy property parameter is respectively: tensile strength 790MPa under the room temperature condition, and yield strength 675MPa, relative reduction in area is 18.5%.Tensile strength 565MPa under 900 ℃ of hot conditionss, yield strength 545MPa, relative reduction in area is that be 185.3h the creep rupture life under 11.0%, 980 ℃, 83MPa condition.The performance perameter of virgin material K441 alloy is respectively, tensile strength 760MPa under the room temperature condition, and yield strength 675MPa, relative reduction in area is 12.5%.Tensile strength 540MPa under 900 ℃ of hot conditionss, yield strength 450MPa, relative reduction in area is that be 38h the creep rupture life under 5.0%, 980 ℃, 83MPa condition.This alloy at 980 ℃, 83MPa condition following creep rupture life of standard-required is 〉=18h.
Claims (4)
1. the alloy melting method of nickel base superalloy K441 returns, it is characterized in that carrying out according to the following steps: the returns that (1) produces when nickel base superalloy K441 is prepared blade and/or the surface-conditioning of waste casting are clean, place vacuum induction furnace then, starting vacuum apparatus vacuumizes, send the electrofusion alloy, the alloy liquation is warming up to 1590～1650 ℃ carries out refining, refining time is 20～40min, and refining is cooled to alloy molten surface conjunctiva after finishing; The alloy liquation of conjunctiva is heated to 1500～1580 ℃, pours into a defective material ingot; (2) when the composition of a defective material ingot by weight percentage at Al 3.30～3.90%, W11.8～14.0%, Cr 15.2～16.5%, Mo 1.2～2.55%, Zr 0.01～0.03%, and B 0.006～0.008%, and C 0.02～0.035%, surplus is in the scope of Ni the time, prepares to carry out secondary refining; When Al, W in the defective material ingot, Cr, Mo, Zr, B and/or C composition exceed above-mentioned scope, adopt nickel, aluminium, tungsten, chromium, molybdenum, zirconium, chromium boron master alloy and/or carbon as regulating the elemental composition materials, make the composition of respectively regulating elemental composition materials and the mixed whole materials of a defective material ingot meet the mentioned component scope; (3) when not needing to regulate tungsten in the defective material ingot composition, chromium and/or molybdenum composition, one defective material ingot is placed vacuum induction furnace, starting vacuum apparatus vacuumizes, the secondary refining refining ℃ is carried out in feeding temperature-raising to 1590～1650, the secondary refining time is 20～40min, and secondary refining is cooled to alloy molten surface conjunctiva after finishing; When needs are regulated tungsten in the defective material ingot, chromium and/or molybdenum composition, one defective material ingot and nickel, tungsten, chromium and/or the molybdenum regulated in the elemental composition materials are placed vacuum induction furnace, starting vacuum apparatus vacuumizes, be warming up to 1590～1650 ℃ and carry out secondary refining, the secondary refining time is 20～40min; Refining is cooled to alloy molten surface conjunctiva after finishing; When needs are regulated carbon in the defective material ingot, aluminium, boron and/or zirconium, the alloy liquation of conjunctiva behind the secondary refining is heated to conjunctiva to be melted fully, and the carbon, aluminium, chromium boron master alloy and/or the zirconium that add in the adjusting elemental composition materials carry out alloying, insulation 2～10min is cooled to alloy molten surface conjunctiva; (4) when not needing to regulate carbon in the defective material ingot composition, aluminium, boron and zirconium in the step (3), the alloy liquation that secondary refining in the step 3 is finished the back conjunctiva is heated to 1500～1580 ℃, pours into the K441 alloy pig then; When needing to regulate carbon in the defective material ingot composition, aluminium, boron and/or zirconium in the step 3, the alloy liquation of conjunctiva after step (3) interalloyization is heated to 1500～1580 ℃, pour into the K441 alloy pig then.
2. the alloy melting method of a kind of nickel base superalloy K441 returns according to claim 1, after it is characterized in that the startup vacuum apparatus vacuumizes in the described step (1), when vacuum tightness≤1.33Pa send the electrofusion alloy, control vacuum tightness≤10.66Pa in the alloy melting process, control vacuum tightness≤1.33Pa in the refining process.
3. the alloy melting method of a kind of nickel base superalloy K441 returns according to claim 1, after it is characterized in that the startup vacuum apparatus vacuumizes in the described step (3), when vacuum tightness≤1.33Pa send the electrofusion alloy, control vacuum tightness≤10.66P in the alloy melting process, control vacuum tightness≤1.33Pa in the refining process.
4. the alloy melting method of a kind of nickel base superalloy K441 returns according to claim 1 when it is characterized in that carrying out alloying in the described step (4) under vacuum condition, is controlled vacuum tightness≤1.33Pa in the heat-processed.
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| CN100387736C (en) * | 2005-12-22 | 2008-05-14 | 沈阳黎明航空发动机(集团)有限责任公司 | Vacuum smelting technology of hafnium containing nickel base casting high temperature alloy K488 reverse material alloy |
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