CN106676299A - Method for improving component uniformity of W elements in GH4720Li alloy - Google Patents
Method for improving component uniformity of W elements in GH4720Li alloy Download PDFInfo
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- CN106676299A CN106676299A CN201611243269.8A CN201611243269A CN106676299A CN 106676299 A CN106676299 A CN 106676299A CN 201611243269 A CN201611243269 A CN 201611243269A CN 106676299 A CN106676299 A CN 106676299A
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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 method for improving the component uniformity of W elements in GH4720Li alloy. Pure metallic W is replaced with nickel-tungsten intermediate alloy, a smelting mode with vacuum induction smelting and two times of vacuum consumable smelting is adopted, and low-smelting-speed controlled smelting is adopted for the second time of vacuum consumable smelting. On the premise that the yield of cast ingots is not decreased, the W elements in the cast ingots are distributed more uniformly. The problem of component difference in all positions of the cast ingots due to nonuniform distribution of the W elements, and accordingly the forging process of the alloy is influenced is solved, and the method has important functions on improving the component uniformity of the W elements and the performance uniformity of forge pieces.
Description
Technical field
The invention belongs to high temperature alloy technical field of smelting, and in particular to a kind of to improve GH4720Li alloy W elemental compositions
The method of uniformity.
Background technology
GH4720Li is a kind of Ni-based ageing strengthening type high temperature alloy, mainly for the manufacture of using temperature be 650-750 DEG C
High-performance compressor and the turbine disk and 900 DEG C of turbine disks for using at short notice.The alloying level of GH4720Li is non-
Chang Gao, while also bringing the segregation in high temperature alloy ingot casting.Through melting ingot casting in process of setting due to
Segregation effect easily forms low melting point γ+γ ＇ eutectics, η phases and Ni5The low melting points such as Zr are organized, this to follow-up Homogenization Treatments and
Forging has manufactured difficulty, while also the deformation to GH720Li proposes acid test.
In the alloy, the content of alloying element is relatively up to more than 40%, and it is strong that Al, Ti element considerably increases major precipitation
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 of intergranular reinforcing, make the high temperature
Alloy has excellent high-temperature behavior, and wherein W elements can play a part of solution strengthening, it is also possible in γ ＇ phases, increases
Mismatch between γ ＇ and matrix；W elements also can substantially reduce the stacking fault energy of matrix simultaneously, be effectively improved the compacted of high temperature alloy
Become performance.Therefore uniformity of the W elements in ingot casting is improved, for ingot casting uniformity is improved, improves forgeability, with important
Effect.
The content of the invention
It is an object of the invention to provide a kind of method of raising GH4720Li alloy W elemental composition uniformities, solves existing
There is the uneven 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 is comprised the following steps：
Step 1, according to GH4720Li alloy proportions, determines that raw material electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel molybdenum are closed
Golden, pure titanium, fine aluminium, ni-b alloy, pure zirconium, the consumption of carbon；
Step 2, vacuum induction melting：
Raw material described in step 1 is separately added in vaccum sensitive stove carries out vacuum induction melting for ingot casting；
Step 3, vacuum consumable smelting：
The ingot casting obtained to step 3 carries out vacuum consumable smelting twice, and second vacuum consumable smelting is using eutectic speed control
Melting processed.
The characteristics of of the invention, also resides in,
In step 1, nickel tungsten is NiW45 intermediate alloys.
In step 1, electrolytic nickel, electric cobalt are surface-treated, and after the completion of process, surface is answered clean and metal light tone is presented, so
Carry out the drying of 10h afterwards with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromium at 100 DEG C.
Step 2 is specially：It is firstly added electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel-molybdenum alloy and carbon fusing, fusing speed
Less than 1/4 maximum heat size/h, be subsequently adding pure titanium, fine aluminium, ni-b alloy, pure zirconium carries out refine to degree；Control cast after refine
Temperature is poured into a mould.
Refining temperature is 1450-1550 DEG C, and refining time is 30-90min；Pouring temperature is 1450-1550 DEG C.
Cast ingot mould specification is Φ 280~Φ 400mm.
Crucible of the vacuum consumable smelting using 340~480mm of Φ in step 3, before melting, leak rate is controlled in 2.0Pa/
Below min, in fusion process, in below 2.0Pa, melting electric current selects 2~10kA, melting voltage to select 22 to vacuum degree control
~25V, melting speed control are more than 1.0 hours the cool time after 4-7kg/min, melting.
Secondary vacuum consumable smelting in step 3, using the crucible of 410~560mm of Φ, before melting, leak rate is controlled in 1.0Pa/
Below min, in fusion process, in below 1.0Pa, melting electric current selects 2~8kA to vacuum degree control, and melting voltage selects 21~
25V, melting speed control are more than 1.0 hours the cool time after 2-5kg/min, melting.
Helium gas cooling is filled with during vacuum consumable smelting twice in step 3, helium pressure is filled and is controlled in 200-600Pa.
The invention has the beneficial effects as follows, 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
Used in secondary melting, the method for low melting speed control realizes process stabilization 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 as caused by W elemental composition skewness, ingot casting is each
Position component difference, it is so as to affect the forging technology of alloy, uniform for the performance of the homogeneity of ingredients and forging that solve W elements
Property has important function.
Description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is the horizontal 9 points of W distribution diagram of element of casting head obtained in embodiment 1；
Fig. 3 is the 5 points of W distribution diagram of element in ingot casting longitudinal direction obtained in embodiment 1；
Fig. 4 is the horizontal 9 points of W distribution diagram of element of casting head obtained in embodiment 2；
Fig. 5 is the 5 points of W distribution diagram of element in ingot casting longitudinal direction obtained in embodiment 2.
Specific 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, and after the completion of process, surface should
It is clean and metal light tone is presented, exist with the alloy raw material such as nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromium after the completion of process
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 calculating according to alloy target composition, 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：
Vacuum induction melting is carried out in adding raw materials into vaccum sensitive stove, Ni, Cr, Co, NiW, NiMo, C is firstly added and is melted
Change, burn-off rate is less than 1/4 maximum heat size/h, and being subsequently adding Al, Ti, NiB, Zr carries out refine, refining temperature 1450-1550
DEG C, refining time 30-90min；Pouring temperature is controlled after refine for 1450-1550 DEG C in the ingot that specification is Φ 260~Φ 410mm
Mould double teeming is noted.Ingot casting after the completion of melting to obtaining carries out grinding process.
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
Gas rate is controlled in below 2.0Pa/min, in fusion process vacuum degree control in below 2.0Pa, melting electric current selects 2~
10kA, melting voltage select 22~25V, speed of melting to select 4-7kg/min, and after melting, cool time is more than 1.0 hours, melting
After the completion of whole ingot strip off the skin process；Helium gas cooling is filled with fusion process, helium pressure is filled and is controlled in 200-600Pa.
Step 5, secondary vacuum consumable smelting：
Electrode is turned around to weld, and secondary vacuum consumable smelting is carried out in the crucible of 440~560mm of diameter of phi, gas leakage before melting
Rate is controlled in below 1.0Pa/min, and in fusion process, in below 1.0Pa, melting electric current selects 2~8kA to vacuum degree control, melts
Refining voltage selects 21~25V, melts speed and selects 2-5kg/min, and using low melting speed control, after melting, cool time is more than 1.0 hours.
Helium gas cooling is filled with fusion process, helium pressure is filled and is controlled in 200-600Pa.
The present invention improves the production method of GH4720Li alloy W elemental composition uniformities, passes through：1) select suitable tungsten unit
Plain intermediate alloy.The fusing point of pure tungsten metal is 3422 DEG C, and generally 1400-1600 DEG C of the bath temperature of vacuum induction melting it
Between, well below the fusing point of tungsten metal.Therefore the time grown very much is needed to dissolve tungsten metal, it is difficult to obtain wolfram element
The melt being evenly distributed.By selecting nickel tungsten intermediate alloy, in alloy, wolfram element percetage by weight is 45%, 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 twice, each consumable melts
Refining is carried out turning around welding, promotes the uniformity of alloy composition end to end.3) using low melting speed control in secondary vacuum consumable smelting
Method of smelting, reduces energy input, shortens the width of mushy zone, while the stability of fusion process can be improved, further carries
The homogeneity of ingredients of high wolfram element.
Using the GH4720Li alloys of the different size of the inventive method 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 carried out into surface sand-blasting process, after process 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, fed intake according to proportioning, alloy proportion and raw materials used and consumption are shown in Table 2 and 3.
The 2-in-1 aurification of table studies distribution ratio, wt%
3 raw material of table and consumption
3. vacuum induction melting：
Ingot mould of the vacuum induction melting using Φ 350mm, burn-off rate 700kg/h, 1480 DEG C of refining temperature, refining time
60min；Pouring temperature is 1480 DEG C.Polished after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding and carries out melting, and one time vacuum consumable smelting adopts Φ 430mm specification crucibles, secondary vacuum
Consumable smelting adopts Φ 510mm specification crucibles, and it is 5.5kg/min that a vacuum consumable smelting melts speed, terminates rear ingot casting and is taken off
Skin process 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 | Cool time h | |
| Once | ≤1.0 | ≤2 | 4~7 | 22~24 | 300 | ≥1 |
| It is secondary | ≤0.5 | ≤1 | 3~6 | 22~24 | 300 | ≥1 |
Casting head lateral cross section to obtaining carries out 9 points of samplings, 5 points of sample analysis ingot casting entirety compositions of surface longitudinal
Uniformity results are shown in Fig. 2 and Fig. 3.Being evenly distributed for W elements be 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 carried out into surface sand-blasting process, after process 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, fed intake according to proportioning, alloy proportion and raw materials used and consumption are shown in Table 5 and 6.
5 alloy composition proportioning of table, wt%
6 raw material of table and consumption
3. vacuum induction melting：
Ingot mould of the vacuum induction melting using Φ 280mm, burn-off rate 300kg/h, 1450 DEG C of refining temperature, refining time
30min；Pouring temperature is 1450 DEG C.Polished after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding and carries out melting, and one time vacuum consumable smelting adopts Φ 360mm specification crucibles, secondary vacuum
Consumable smelting adopts Φ 440mm specification crucibles, and the molten speed of a vacuum consumable smelting is 4kg/min, terminates rear ingot casting and is taken off
Skin process 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 | Cool time h | |
| Once | ≤1.0 | ≤2 | 2~6 | 22~24 | 200 | ≥1 |
| It is secondary | ≤0.5 | ≤1 | 2~5 | 22~24 | 200 | ≥1 |
Casting head lateral cross section to obtaining carries out 9 points of samplings, 5 points of sample analysis ingot casting entirety compositions of surface longitudinal
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 carried out into surface sand-blasting process, after process 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, fed intake according to proportioning, alloy proportion and raw materials used and consumption are shown in Table 8 and 9.
8 alloy composition proportioning of table, wt%
9 material of table and consumption
3. vacuum induction melting：
Ingot mould of the vacuum induction melting using Φ 400mm, burn-off rate 700kg/h, 1550 DEG C of refining temperature, refining time
90min；Pouring temperature is 1550 DEG C.Polished after the completion of melting.
4. vacuum consumable smelting：
Electrode turns around to carry out welding and carries out melting, and one time vacuum consumable smelting adopts Φ 480mm specification crucibles, secondary vacuum
Consumable smelting adopts Φ 560mm specification crucibles, and the molten speed of a vacuum consumable smelting is 7kg/min, terminates rear ingot casting and is taken off
Skin process 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.
The refining procedure parameter control of table 10
| Leak rate Pa/min | Vacuum Pa | Melting electric current kA | Melting voltage V | Fill helium pressure Pa | Cool 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 (9)
1. a kind of 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, determines raw material electrolytic nickel, pure chromium, electric cobalt, nickel tungsten, nickel-molybdenum alloy, pure
Titanium, fine aluminium, ni-b alloy, pure zirconium, the consumption of carbon；
Step 2, vacuum induction melting：
Raw material described in step 1 is separately added in vaccum sensitive stove carries out vacuum induction melting for ingot casting；
Step 3, vacuum consumable smelting：
The ingot casting obtained to step 3 carries out vacuum consumable smelting twice, and second vacuum consumable smelting is molten using low melting speed control
Refining.
2. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist
In in the step 1, nickel tungsten is NiW45 intermediate alloys.
3. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist
In in the step 1, electrolytic nickel, electric cobalt are surface-treated, and after the completion of process, surface is answered clean and metal light tone is presented, then
The drying of 10h is carried out with nickel tungsten, nickel-molybdenum alloy, pure titanium, fine aluminium, pure chromium at 100 DEG C.
4. the method for a kind 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
Less than or equal to 1/4 maximum heat size/h, be subsequently adding pure titanium, fine aluminium, ni-b alloy, pure zirconium carries out refine to degree；Control after refine
Pouring temperature is poured into a mould.
5. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 4, its feature exist
In the refining temperature is 1450-1550 DEG C, and refining time is 30-90min；Pouring temperature is 1450-1550 DEG C.
6. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 4, its feature exist
In the cast ingot mould specification is Φ 260~Φ 400mm.
7. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist
In, crucible of the vacuum consumable smelting using 340~480mm of Φ in the step 3, before melting, leak rate is controlled in 2.0Pa/
Below min, in fusion process, in below 2.0Pa, melting electric current selects 2~10kA, melting voltage to select 22 to vacuum degree control
~25V, melting speed control are more than 1.0 hours the cool time after 4-7kg/min, melting.
8. the method for a kind of raising GH4720Li alloy W elemental composition uniformities according to claim 1, its feature exist
In, secondary vacuum consumable smelting in the step 3, using the crucible of 410~560mm of Φ, before melting, leak rate is controlled in 1.0Pa/
Below min, in fusion process, in below 1.0Pa, melting electric current selects 2~8kA to vacuum degree control, and melting voltage selects 21~
25V, melting speed control are more than 1.0 hours the cool time after 2-5kg/min, melting.
9. the method for a kind 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 and control in 200-600Pa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923513A (en) * | 2019-12-06 | 2020-03-27 | 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 |
| WO2021036226A1 (en) * | 2019-08-28 | 2021-03-04 | 北京钢研高纳科技股份有限公司 | Large-size high-niobium and high-temperature 706 alloy ingot and smelting process thereof |
| WO2021036225A1 (en) * | 2019-08-28 | 2021-03-04 | 北京钢研高纳科技股份有限公司 | Smelting process for high-niobium high-temperature alloy large-size cast ingot, and high-niobium high-temperature alloy large-size cast ingot |
| 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 |
| CN113862520A (en) * | 2021-08-26 | 2021-12-31 | 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 |
| US11859262B2 (en) | 2019-08-28 | 2024-01-02 | Gaona Aero Material Co., Ltd. | Large-sized high-Nb superalloy ingot and smelting process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021036226A1 (en) * | 2019-08-28 | 2021-03-04 | 北京钢研高纳科技股份有限公司 | Large-size high-niobium and high-temperature 706 alloy ingot and smelting process thereof |
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| US11859262B2 (en) | 2019-08-28 | 2024-01-02 | Gaona Aero Material Co., Ltd. | Large-sized high-Nb superalloy ingot and smelting process thereof |
| CN110923513A (en) * | 2019-12-06 | 2020-03-27 | 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 |
| CN113862520A (en) * | 2021-08-26 | 2021-12-31 | 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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