CN106676299B - A kind of method of raising GH4720Li alloy W elemental composition uniformities - Google Patents
A kind of method of raising GH4720Li alloy W elemental composition uniformities Download PDFInfo
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- CN106676299B CN106676299B CN201611243269.8A CN201611243269A CN106676299B CN 106676299 B CN106676299 B CN 106676299B CN 201611243269 A CN201611243269 A CN 201611243269A CN 106676299 B CN106676299 B CN 106676299B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
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Abstract
The invention discloses a kind of method of raising GH4720Li alloy W elemental composition uniformities, pure W metals are replaced using nickel tungsten intermediate alloy, using vacuum induction melting plus the melting mode of vacuum consumable smelting, and low melting speed control melting is used in second of vacuum consumable smelting twice.The present invention is on the premise of ensureing not reducing ingot casting yield rate so that the W Elemental redistributions in ingot casting are more uniform.Solve due to ingot casting each position component difference caused by W elemental composition skewness, so as to influence the forging technology of alloy, the performance uniformity of homogeneity of ingredients and forging for solving W elements plays an important roll.
Description
Technical field
The invention belongs to high temperature alloy technical field of smelting, and in particular to one kind improves GH4720Li alloy W elemental compositions
The method of uniformity.
Background technology
GH4720Li is a kind of Ni-based ageing strengthening type high temperature alloy, is 650-750 DEG C mainly for the manufacture of temperature in use
High-performance compressor and the turbine disk and 900 DEG C of turbine disks used in a short time.The alloying level of GH4720Li is non-
Chang Gao, while also bring the segregation in high temperature alloy ingot casting.Ingot casting by melting in process of setting due to
Segregation effect easily forms low melting point γ+γ ＇ eutectics, η phases and Ni5The low melting point tissue such as Zr, this to follow-up Homogenization Treatments and
Forging has manufactured difficulty, while also the deformation to GH720Li proposes acid test.
For the content of alloying element relatively up to more than 40%, it is strong that Al, Ti element considerably increase major precipitation in the alloy
Change the solution strengthening elements such as the content of phase γ ＇ phases, substantial amounts of Co, Mo and play the elements such as Zr, B that intergranular is strengthened, make the high temperature
Alloy has excellent high-temperature behavior, and wherein W elements can play the role of solution strengthening, can also enter in γ ＇ phases, increase
Mismatch between γ ＇ and matrix；W elements also can substantially reduce the stacking fault energy of matrix at the same time, be effectively improved the compacted of high temperature alloy
Become performance.Therefore uniformity of the W elements in ingot casting is improved, for improving ingot casting uniformity, improves forgeability, has important
Effect.
The content of the invention
The object of the present invention is to provide a kind of method of raising GH4720Li alloy W elemental composition uniformities, solves existing
There is the non-uniform problem of W Elemental redistributions present in Φ 440-560mm specification GH4720Li ingot castings.
The technical solution adopted in the present invention is：A kind of method of raising GH4720Li alloy W elemental composition uniformities, tool
Body comprises the following steps：
Step 1, according to GH4720Li alloy proportions, determine that raw material electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel molybdenum close
Golden, pure titanium, fine aluminium, ni-b alloy, pure zirconium, the dosage of carbon；
Step 2, vacuum induction melting：
It is ingot casting that raw material described in step 1, which is separately added into vaccum sensitive stove, and carries out vacuum induction melting；
Step 3, vacuum consumable smelting：
The ingot casting obtained to step 3 carries out vacuum consumable smelting twice, and second of vacuum consumable smelting is using eutectic speed control
Melting processed.
The features of the present invention also resides in,
Nickel tungsten is NiW45 intermediate alloys in step 1.
Electrolytic nickel, electric cobalt are surface-treated in step 1, and processing completes rear surface and answers clean and metal light tone is presented, so
Carry out the drying of 10h at 100 DEG C with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromium afterwards.
Step 2 is specially：It is firstly added electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel-molybdenum alloy and carbon fusing, fusing speed
Degree is less than 1/4 maximum heat size/h, then adds pure titanium, fine aluminium, ni-b alloy, pure zirconium and is refined；Cast is controlled after refining
Temperature is poured into a mould.
Refining temperature is 1450-1550 DEG C, refining time 30-90min；Pouring temperature is 1450-1550 DEG C.
It is 280~Φ of Φ 400mm to pour into a mould ingot mould specification.
A vacuum consumable smelting uses the crucible of 340~480mm of Φ in step 3, and leak rate control is in 2.0Pa/ before melting
Below min, for vacuum degree control in below 2.0Pa, melting electric current selects 2~10kA, melting voltage selection 22 in fusion process
~25V, melting speed control is when 4-7kg/min, melting postcooling time are small more than 1.0.
Secondary vacuum consumable smelting in step 3, using the crucible of 410~560mm of Φ, leak rate control is in 1.0Pa/ before melting
Below min, for vacuum degree control in below 1.0Pa, melting electric current selects 2~8kA in fusion process, and melting voltage selection 21~
25V, melting speed control is when 2-5kg/min, melting postcooling time are small more than 1.0.
Helium gas cooling is filled with during vacuum consumable smelting twice in step 3, fills helium pressure control in 200-600Pa.
The invention has the advantages that a kind of method of raising GH4720Li alloy W elemental composition uniformities, using NiW
Intermediate alloy replaces dystectic W metals, using vacuum induction melting plus the melting mode of vacuum consumable smelting twice, the 3rd
In secondary melting process stability contorting is realized using the method for low melting speed control.The present invention is before ensureing not reducing ingot casting yield rate
Put so that the W Elemental redistributions in ingot casting are more uniform.Solve since ingot casting caused by W elemental composition skewness is each
Position component difference, so as to influence the forging technology of alloy, the performance of homogeneity of ingredients and forging for solution W elements is uniform
Property plays an important roll.
Brief description of the drawings
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is the laterally nine point W distribution diagram of element of casting head made from embodiment 1；
Fig. 3 is five point W distribution diagram of element of ingot casting longitudinal direction made from embodiment 1；
Fig. 4 is the laterally nine point W distribution diagram of element of casting head made from embodiment 2；
Fig. 5 is five point W distribution diagram of element of ingot casting longitudinal direction made from embodiment 2.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
A kind of method of raising GH4720Li alloy W elemental composition uniformities of the present invention, as shown in Figure 1, specifically include with
Lower step：
Step 1, the high-quality electrolytic nickel for meeting national standard, electric cobalt etc. are surface-treated, rear surface is completed in processing should
Clean and presentation metal light tone, exists after the completion of processing with alloy raw materials such as nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromiums
The drying of 10h is carried out at 100 DEG C.The nickel tungsten wherein selected is NiW45.
Step 2, the alloy amount added required for being calculated according to alloy target component, the component requirements of GH4720Li alloys are shown in
Table 1.
The requirement of 1 alloy composition of table, wt%
Step 3, vacuum induction melting：
Add raw materials into and vacuum induction melting is carried out in vaccum sensitive stove, be firstly added Ni, Cr, Co, NiW, NiMo, C and melt
Change, burn-off rate is less than 1/4 maximum heat size/h, then adds Al, Ti, NiB, Zr and is refined, refining temperature 1450-1550
DEG C, refining time 30-90min；It is 1450-1550 DEG C in the ingot that specification is 260~Φ of Φ 410mm that pouring temperature is controlled after refining
Mould double teeming is noted.Grinding process is carried out to obtained ingot casting after the completion of melting.
Step 4, a vacuum consumable smelting：
Electrode is turned around to weld, a vacuum consumable smelting is carried out in the crucible of 340~480mm of diameter of phi, leakage before melting
The control of gas rate in below 2.0Pa/min, in fusion process vacuum degree control in below 2.0Pa, melting electric current selection 2~
10kA, melting voltage select 22~25V, speed of melting selection 4-7kg/min, when the melting postcooling time is small more than 1.0, melting
After the completion of whole ingot strip off the skin processing；Helium gas cooling is filled with fusion process, fills helium pressure control in 200-600Pa.
Step 5, secondary vacuum consumable smelting：
Electrode is turned around to weld, carries out secondary vacuum consumable smelting in the crucible of 440~560mm of diameter of phi, gas leakage before melting
Rate is controlled in below 1.0Pa/min, and vacuum degree control selects 2~8kA in below 1.0Pa, melting electric current in fusion process, melts
Refining voltage selects 21~25V, melts speed selection 2-5kg/min, using low melting speed control, when the melting postcooling time is small more than 1.0.
Helium gas cooling is filled with fusion process, fills helium pressure control in 200-600Pa.
The present invention improves the production method of GH4720Li alloy W elemental composition uniformities, passes through：1) suitable tungsten member is selected
Plain intermediate alloy.The fusing point of pure tungsten metal be 3422 DEG C, and the bath temperature of vacuum induction melting be generally 1400-1600 DEG C it
Between, well below the fusing point of tungsten metal.Therefore the time for needing to grow very much is dissolved tungsten metal, it is difficult to obtain wolfram element
The melt being evenly distributed.By selecting nickel tungsten intermediate alloy, wolfram element percetage by weight is 45% in alloy, and alloy melting point is dropped
Low to 1500 DEG C or so, close to the bath temperature of vacuum induction melting, greatly shorten the fusing time and of wolfram element
Homogenisation times, it is easier to obtain the uniform alloy melt of W Elemental redistributions.2) using vacuum consumable smelting, each consumable melt twice
Refining carries out turning around to weld, and promotes the uniformity of alloy component end to end.3) low melting speed control is used in secondary vacuum consumable smelting
Method of smelting, reduces energy input, shortens the width of mushy zone, while can improve the stability of fusion process, further carries
The homogeneity of ingredients of high wolfram element.
Using the GH4720Li alloys of the different size of the method for the present invention melting, good effect is achieved.
Embodiment 1
The GH4720Li high temperature alloy ingot castings of a diameter of Φ 510mm of melting.
1. raw material disposal：
Electrolysis Ni and electric cobalt are subjected to surface sand-blasting process, after processing with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium,
Pure chromium carries out the drying of 10h at 100 DEG C.
2. dispensing：
Determine alloy proportion, feed intake according to proportioning, alloy proportion and raw materials used and dosage are shown in Table 2 and 3.
2 alloy composition of table matches, wt%
3 raw materials and consumption of table
3. vacuum induction melting：
Vacuum induction melting uses the ingot mould of Φ 350mm, burn-off rate 700kg/h, 1480 DEG C of refining temperature, refining time
60min；Pouring temperature is 1480 DEG C.Polish after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding progress melting, and one time vacuum consumable smelting uses Φ 430mm specification crucibles, secondary vacuum
Consumable smelting uses Φ 510mm specification crucibles, and it is 5.5kg/min that a vacuum consumable smelting, which melts speed, after ingot casting taken off
Skin processing carries out secondary vacuum consumable smelting again, and the molten speed of secondary vacuum consumable smelting is 3.8kg/min.The parameter of melting twice
It is shown in Table 4.
4 fusion process state modulator of table
| Leak rate Pa/min | Vacuum Pa | Melting electric current kA | Melting voltage V | Fill helium pressure Pa | Cooling time h | |
| Once | ≤1.0 | ≤2 | 4~7 | 22~24 | 300 | ≥1 |
| It is secondary | ≤0.5 | ≤1 | 3~6 | 22~24 | 300 | ≥1 |
5 nine point samplings, surface longitudinal sampling analysis ingot casting entirety components are carried out to obtained casting head lateral cross section
Uniformity results are shown in Fig. 2 and Fig. 3.Being evenly distributed for W elements can be seen that by 2 and Fig. 3.
Embodiment 2
The GH4720Li high temperature alloy ingot castings of a diameter of Φ 440mm of melting.
1. raw material disposal：
Electrolysis Ni and electric cobalt are subjected to surface sand-blasting process, after processing with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium,
Pure chromium carries out the drying of 10h at 100 DEG C.
2. dispensing：
Determine alloy proportion, feed intake according to proportioning, alloy proportion and raw materials used and dosage are shown in Table 5 and 6.
5 alloy composition of table matches, wt%
6 raw materials and consumption of table
3. vacuum induction melting：
Vacuum induction melting uses the ingot mould of Φ 280mm, burn-off rate 300kg/h, 1450 DEG C of refining temperature, refining time
30min；Pouring temperature is 1450 DEG C.Polish after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding progress melting, and one time vacuum consumable smelting uses Φ 360mm specification crucibles, secondary vacuum
Consumable smelting uses Φ 440mm specification crucibles, and the molten speed of a vacuum consumable smelting is 4kg/min, after ingot casting taken off
Skin processing carries out secondary vacuum consumable smelting again, and the molten speed of secondary vacuum consumable smelting is 2kg/min.The parameter of melting twice is shown in
Table 7.
7 fusion process state modulator of table
| Leak rate Pa/min | Vacuum Pa | Melting electric current kA | Melting voltage V | Fill helium pressure Pa | Cooling time h | |
| Once | ≤1.0 | ≤2 | 2~6 | 22~24 | 200 | ≥1 |
| It is secondary | ≤0.5 | ≤1 | 2~5 | 22~24 | 200 | ≥1 |
5 nine point samplings, surface longitudinal sampling analysis ingot casting entirety components are carried out to obtained casting head lateral cross section
Uniformity results are shown in Fig. 4 and Fig. 5.W Elemental redistribution uniformities can be seen that by Fig. 4 and Fig. 5.
Embodiment 3
The GH4720Li high temperature alloy ingot castings of a diameter of Φ 560mm of melting.
1. raw material disposal：
Electrolysis Ni and electric cobalt are subjected to surface sand-blasting process, after processing with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium,
Pure chromium carries out the drying of 10h at 100 DEG C.
2. dispensing：
Determine alloy proportion, feed intake according to proportioning, alloy proportion and raw materials used and dosage are shown in Table 8 and 9.
8 alloy composition of table matches, wt%
9 material of table and dosage
3. vacuum induction melting：
Vacuum induction melting uses the ingot mould of Φ 400mm, burn-off rate 700kg/h, 1550 DEG C of refining temperature, refining time
90min；Pouring temperature is 1550 DEG C.Polish after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding progress melting, and one time vacuum consumable smelting uses Φ 480mm specification crucibles, secondary vacuum
Consumable smelting uses Φ 560mm specification crucibles, and the molten speed of a vacuum consumable smelting is 7kg/min, after ingot casting taken off
Skin processing carries out secondary vacuum consumable smelting again, and the molten speed of secondary vacuum consumable smelting is 5kg/min.The parameter of melting twice is shown in
Table 10.
Table 10 refines procedure parameter control
| Leak rate Pa/min | Vacuum Pa | Melting electric current kA | Melting voltage V | Fill helium pressure Pa | Cooling time h | |
| Once | ≤1.0 | ≤2 | 4~10 | 23~25 | 600 | ≥1 |
| It is secondary | ≤0.5 | ≤1 | 4~8 | 23~25 | 600 | ≥1 |
Claims (8)
- A kind of 1. method of raising GH4720Li alloy W elemental composition uniformities, it is characterised in that specifically include following steps：Step 1, according to GH4720Li alloy proportions, raw material electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel-molybdenum alloy, pure is determined Titanium, fine aluminium, ni-b alloy, pure zirconium, the dosage of carbon；The nickel tungsten is NiW45 intermediate alloys；Step 2, vacuum induction melting：It is ingot casting that raw material described in step 1, which is separately added into vaccum sensitive stove, and carries out vacuum induction melting；Step 3, vacuum consumable smelting：Vacuum consumable smelting, second of vacuum consumable smelting are melted using low melting speed control twice for the ingot casting progress obtained to step 2 Refining.
- 2. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist In electrolytic nickel, electric cobalt are surface-treated in the step 1, and processing completes rear surface and answers clean and metal light tone is presented, then The drying of 10h is carried out at 100 DEG C with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromium.
- 3. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist In the step 2 is specially：It is firstly added electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel-molybdenum alloy and carbon fusing, fusing speed Degree is less than or equal to 1/4 maximum heat size/h, then adds pure titanium, fine aluminium, ni-b alloy, pure zirconium and is refined；Controlled after refining Pouring temperature is poured into a mould.
- 4. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 3, its feature exist In the refining temperature is 1450-1550 DEG C, refining time 30-90min；Pouring temperature is 1450-1550 DEG C.
- 5. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 3, its feature exist In the ingot mould specification of the cast is 260~Φ of Φ 400mm.
- 6. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist In first time vacuum consumable smelting uses the crucible of 340~480mm of Φ in the step 3, and leak rate control is in 2.0Pa/ before melting Below min, for vacuum degree control in below 2.0Pa, melting electric current selects 2~10kA, melting voltage selection 22 in fusion process ~25V, melting speed control is when 4-7kg/min, melting postcooling time are small more than 1.0.
- 7. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist In second of vacuum consumable smelting in the step 3, using the crucible of 410~560mm of Φ, leak rate, which controls, before melting exists Below 1.0Pa/min, for vacuum degree control in below 1.0Pa, melting electric current selects 2~8kA, the choosing of melting voltage in fusion process 21~25V is selected, melting speed control is when 2-5kg/min, melting postcooling time are small more than 1.0.
- 8. a kind of method of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist In being filled with helium gas cooling during vacuum consumable smelting twice in the step 3, fill helium pressure control in 200-600Pa.
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| CN111876649B (en) * | 2019-08-28 | 2022-05-24 | 北京钢研高纳科技股份有限公司 | Smelting process of high-niobium high-temperature alloy large-size ingot and high-niobium high-temperature alloy large-size ingot |
| CN111876651B (en) * | 2019-08-28 | 2022-05-24 | 北京钢研高纳科技股份有限公司 | Large-size high-niobium high-temperature 706 alloy ingot and smelting process thereof |
| EP4023779A4 (en) | 2019-08-28 | 2023-09-20 | Gaona Aero Material Co., Ltd. | Smelting process for high-niobium high-temperature alloy large-size cast ingot, and high-niobium high-temperature alloy large-size cast ingot |
| CN110923513B (en) * | 2019-12-06 | 2021-01-08 | 北京钢研高纳科技股份有限公司 | Vacuum induction melting process of GH4720Li alloy, GH4720Li alloy and aviation parts |
| CN113444889A (en) * | 2021-05-19 | 2021-09-28 | 重庆材料研究院有限公司 | Method for uniformly distributing aluminum and titanium of nickel-based alloy electroslag ingot |
| CN113862520B (en) * | 2021-08-26 | 2022-07-19 | 北京钢研高纳科技股份有限公司 | GH4720Li high-temperature alloy for aero-engine forged blade, preparation method and application thereof, and alloy ingot |
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| CN104561664A (en) * | 2014-12-09 | 2015-04-29 | 抚顺特殊钢股份有限公司 | Smelting technique of novel nickel-iron-base high-temperature alloy GH4169D |
| CN105506390B (en) * | 2015-12-30 | 2017-06-23 | 钢铁研究总院 | A kind of nickel base superalloy containing zirconium and preparation method |
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