CN102560165A - Method for smelting K417G alloy by using K417 alloy returns - Google Patents
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Abstract
The invention relates to a method for smelting K417G alloy by using K417 alloy returns. The method comprises the following steps of: carrying out sand blowing cleaning on the surface of the K417 alloy returns, and smelting the K417 alloy returns by adopting a vacuum induction furnace to form primary returns ingot; smelting intermediate alloy which comprises the following chemical components in percentage by weight (wt%): 0.07-0.08 of C, 4.92-5.30 of Al, 4.83-4.96 of Co, 8.72-9.26 of Cr, 2.76-3.1 of Mo, 0.064-0.073 of Zr, 0.014-0.02 of B, 4.41-4.46 of Ti, 0.65-0.75 of V, and the rest of Ni, taking corresponding proportions of the components, putting the components into the vacuum induction furnace and smelting the components to intermediate alloy ingot; and respectively taking and mixing the primary returns ingot of the k417 alloy returns and the intermediate alloy ingot in equal weight proportions, putting the mixture into the vacuum induction furnace for smelting, and finally smelting to form the K417G alloy. The method has the advantages of reducing the production cost and turning waste into wealth.
Description
Technical field
The present invention relates to the superalloy field, a kind of method with K417 alloy returns melting K417G alloy is provided especially.
Background technology
The K417G alloy is on the basis of K417 alloy, reduces the nickel-base cast superalloy that 5%Co and 0.3%Ti develop.It not only has, and the K417 alloy density is little, plasticity good, the medium temperature intensity advantages of higher, and the low price good stability, after 850 ℃ of long timeliness, does not separate out the б phase.This alloy has advantages of good casting, can cast complex-shaped hollow blade.The gas-turbine blade, turning vane and other high temperature that are fit to be applied to work under 950 ℃ of conditions are used part.
And the Ni that contains in the K417 alloy, Cr, Mo, Co etc. belong to the rare expensive element of country, are therefore guaranteeing that it is very necessary to use returns to become under functional quality and the safe and reliable prerequisite.Aviation class foundry enterprise has adopted revert alloy to carry out the production of foundry goods in the casting production process of nickel base superalloys such as K424, K403, K417, and has obtained using widely.
And the K417 alloy widely applied with certain old type tube mover in because the update of mover is produced returns urgent needs such as remaining a large amount of waste casting and running and feeding system and is applied.The K417 alloy is identical with the K417G alloying element, and only component content is different, and can therefore adopt K417 alloy returns to produce the K417G alloy have become problem that urgency is to be solved in the production process.
Summary of the invention
The object of the present invention is to provide a kind of method with alloy K417 returns melting K417G alloy, K417 alloy returns can't continue to use the waste problem that causes to solve in the past.
The present invention provides a kind of method with K417 alloy returns melting K417G alloy; This method adopts the K417 returns to be smelted into alloy pig earlier; Adopt metallic element to melt out a kind of master alloy simultaneously, then K417 returns ingot and master alloy are smelted into the K417G alloy jointly, it is characterized in that: the composition reduction by 5% of Co in the K417 revert alloy, the composition of Ti are reduced by 0.3%; Concrete melting step is following
---melting K417 alloy: after the surface of K417 alloy returns carried out blast cleaning, adopt vacuum induction melting to become returns one defective material ingot;
---the melting master alloy: the food ingredient of this master alloy (wt%) as follows, C 0.07 ~ 0.08, Al 4.92 ~ 5.30, Co 4.83 ~ 4.96, Cr 8.72 ~ 9.26, Mo 2.76 ~ 3.1, Zr 0.064 ~ 0.073, B 0.014 ~ 0.02, Ti 4.41 ~ 4.46, V 0.65 ~ 0.75, Ni surplus; The above element of getting corresponding proportion is put into vacuum induction furnace and is smelted into intermediate alloy ingot; Wherein, the food ingredient of master alloy can contain Fe, P, Si, Mn, S element, and requires S＜0.01, P＜0.015, Si＜0.2, Mn＜0.2, Fe＜1.0;
---melting K417G alloy: get each reciprocity weight part of above-mentioned K417 alloy returns one defective material ingot+intermediate alloy ingot respectively and mix; Add the adjustment composition behind the chemical analysis and add element; Reach and put into vacuum induction furnace behind the K417G alloy and carry out melting, finally be smelted into the K417G alloy.
Wherein, the concrete technological process of the melting of said master alloy is following,
---change the clear stage: behind the master alloy ingredient composition; The whole Cr+ of the whole Mo+ of the whole Co+ of about 2/3Ni+1/6 C+ that pack into successively from bottom to up residue Ni vacuumizes vacuum oven then, when vacuum tightness≤0.67Pa; Begin vacuum oven is heated; Continue vacuum oven is vacuumized molten steel temperature＜1530 ℃ ± 10 ℃, vacuum tightness≤10.66Pa simultaneously;
---refining stage: require the vacuum tightness≤1.33Pa of vacuum oven, when molten steel temperature is 1530 ℃ ± 10 ℃, fall power to 80kW, add 1/6 C again, the concise time is 20min～30min, stops heating, freezing treatment 20min～30min;
---the alloying stage 1: vacuum oven is continued heating, and vacuum degree control is at≤0.67Pa, and is high-power behind film; Slowly add alloy element: when temperature is 1420 ℃～1450 ℃, reduce power, at first add 2/3C to 80kW; Treat to add V-Al, Al, Ti successively behind the C fine melt, the whole Al 2min～5min consuming time that adds is heated to power 130kW to induction furnace again and stirs; And the crucible 2～3 times of fascinating, when temperature reaches 1550 ℃～1570 ℃, stop to heat 7min～8min;
---the alloying stage 2: after in vacuum oven, adding CrB and Zr element, continue heating, when temperature reaches 1530 ℃～1560 ℃, stop heating, freezing treatment 30min～35min;
---the cast stage: send electric 180kW, vacuum oven is continued heating towards film, when molten steel temperature is 1450 ℃ ± 10 ℃, pour into a mould, pouring speed is at 1min～2min, and the cast back obtains master alloy in the final melting of vacuum oven internal cooling 10min～20min.
Wherein, in the concrete technological process of the melting of master alloy, according to the fusing point difference just of each element of alloy, master alloy has stipulated to add the order of element, in addition, adopts substep to add the method for C, prevents that C and CrB alloy from forming carbide, influences the quality of alloy.Be refined to 10min and add C, and the crucible 2～3 times of slowly fascinating, borrow the further C deoxidation of high temperature high vacuum condition to degas, remove the detrimental impurity element and realize the alloy homogenizing.Add Al process 2min～5min consuming time during the alloying, it is excessive to forbid once to add alloy, causes too high generation splash of molten pool metal liquid local temperature and melting loss.Add CrB and add by feed compartment, send 140kW power to stir with Zr, the crucible 2～3 times of fascinating, the assurance alloying constituent is even.
The concrete technological process of the melting of said K417G alloy is following,
---change the clear stage: with K417 alloy returns ingot+master alloy material ingot+add crucible that element is put into vacuum oven; Then vacuum oven is vacuumized; When vacuum tightness≤0.67Pa, vacuum oven is heated, continue to vacuumize; Require molten steel temperature＜1530 ℃ ± 10 ℃, vacuum tightness≤10.66Pa;
---refining stage: require the vacuum tightness≤1.33Pa of vacuum oven, when temperature is 1530 ℃ ± 10 ℃, send power 80kW to get into refining, add whole C refining period, the phase stops heating, freezing treatment 25min～30min after carrying out refining 20min～30min;
---the cast stage: the molten steel temperature in vacuum oven is 1450 ℃ ± 10 ℃ to be poured into a mould, and pouring speed is controlled at 1min～2min, and the cast back gets the K417G alloy in the final melting of vacuum oven internal cooling 10min～20min.
Wherein, compare with K417 alloy melting process in the concrete technological process of the melting of K417G alloy, concise temperature is brought up to 80kW by 70kW, has guaranteed the concise temperature of concise phase like this, helps alloy and fully gets rid of obnoxious flavour; Bring up to 180kW towards film temperature by 120kW, improved speed, guaranteed class's product time towards film; Cast power is changed into the trend that is slowly reduced by 120kW by 80kW, has guaranteed the flowability of alloy in casting process, and cast can be carried out smoothly, has guaranteed the lumber recovery of alloy.
Method with K417 alloy returns melting K417G alloy provided by the invention, its advantage is: help the recycle of K417 alloy returns, and environment protection is played a positive role, reduce production cost, turn waste into wealth.
Description of drawings
Fig. 1 is K417 alloy returns synthetic material ingot technology electrical force profiles figure;
Fig. 2 is the technology electrical force profiles figure of master alloy melting;
Fig. 3 is K417G alloy returns synthetic material ingot technology electrical force profiles figure.
Embodiment
Come further to explain the present invention below in conjunction with concrete embodiment, but it does not limit the present invention.
Embodiment 1
At first, melting K417 alloy returns: after the surface of K417 alloy returns carried out blast cleaning, adopt vacuum induction melting to become returns one defective material ingot, concrete melting technology is seen accompanying drawing 1, and composition is seen table 1;
Secondly, the melting master alloy: the whole Cr+ of the whole Mo+ of the whole Co+ of about 2/3Ni+1/6 C+ that pack into successively from bottom to up remain Ni, then vacuum oven are vacuumized, when vacuum tightness≤0.67Pa; Begin vacuum oven is heated, continue simultaneously vacuum oven is vacuumized, require temperature＜1530 ℃ ± 10 ℃, during vacuum tightness≤10.66Pa with alloyization clearly; Change clear the continuation afterwards the vacuum oven heating is required the vacuum tightness≤1.33Pa of vacuum oven, when temperature is 1530 ℃ ± 10 ℃, fall power to 80kW; Carry out refining, refining adds 1/6 C to 10min; The concise time is 20min～30min, stops heating, freezing treatment 20min～30min; Again vacuum oven is continued heating, vacuum degree control is at≤0.67Pa, and is high-power behind film, slowly adds alloy element; When temperature is 1420 ℃～1450 ℃, reduce power to 80kW, at first add 2/3C; Treat to add V-Al, Al, Ti successively behind the C fine melt, the whole Al 2min～5min consuming time that adds is heated to power 130kW to induction furnace again and stirs; And the crucible 2～3 times of fascinating, when temperature reaches 1550 ℃～1570 ℃, stop to heat 7min～8min; Send power 80kW, behind feed compartment adding CrB and Zr element, continue heating, when temperature reaches 1530 ℃～1560 ℃, stop heating, behind freezing treatment 30min～35min; Vacuum oven is continued heating towards film, when temperature is 1450 ℃ ± 10 ℃, pour into a mould, pouring speed is at 1min～2min; The cast back is at vacuum oven internal cooling 10min～20min; Final melting gets master alloy, and concrete melting technology is seen accompanying drawing 2, and concrete composition is seen table 1;
At last, melting K417G alloy: get above-mentioned K417 alloy returns one defective material ingot and intermediate alloy ingot equity weight part respectively,, put into vacuum induction furnace and carry out melting through the adjustment composition; Then vacuum oven is vacuumized, when vacuum tightness≤0.67Pa, vacuum oven is heated, continue to vacuumize; Require temperature＜1530 ℃ ± 10 ℃, under the condition of vacuum tightness≤10.66Pa, change clearly after, continue vacuum oven is heated; Require the vacuum tightness≤1.33Pa of vacuum oven, when temperature is 1530 ℃ ± 10 ℃, carry out refining 20min～30min after; Stop heating, behind freezing treatment 25min～30min, vacuum oven is continued heating; Carry out towards film when requiring temperature to be 1420 ℃～1430 ℃, pour into a mould when the temperature of vacuum molten steel in the stove is 1450 ℃ ± 10 ℃, final melting gets the K417G alloy.Concrete melting technology is seen accompanying drawing 3, finally is smelted into the K417G alloy A.
Table 1:
The K417G alloy A that is smelted into is carried out the test of high temperature endurance performance and the instantaneous performance of high temperature, and its result sees table 2, table 3 respectively.
Table 2: high temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | Unit elongation |
| φ5.00 | 235 | 950 | 83:03 is disconnected | No requirement (NR) |
| φ5.00 | 315 | 900 | 113:10 is disconnected | No requirement (NR) |
| φ5.00 | 647 | 760 | 24:11 is disconnected | 6.0 |
Table 3: the instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | 730 | 14.0 | 15.5 |
Embodiment 2
Melting K417G alloy B, concrete fusion process is identical with fusion process among the embodiment 1, and wherein the concrete composition of each alloy is seen table 4:
Table 4
The K417G alloy B that is smelted into is carried out the test of high temperature endurance performance and the instantaneous performance of high temperature, and its result sees table 5, table 6 respectively,
Table 5: high temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | Unit elongation |
| φ5.00 | 235 | 950 | 79:31 is disconnected | No requirement (NR) |
| φ5.00 | 315 | 900 | 116:51 is disconnected | No requirement (NR) |
| φ5.00 | 647 | 760 | 23:20 is disconnected | 4.8 |
Table 6: the instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | 750 | 11.0 | 11.5 |
Embodiment 3
Melting K417G alloy C, concrete fusion process is identical with fusion process among the embodiment 1, and wherein the concrete composition of each alloy is seen table 7:
Table 7:
K417G alloy C to being smelted into carries out the test of high temperature endurance performance and the instantaneous performance of high temperature, and its result sees table 8, table 9 respectively.
Table 8: high temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | Unit elongation |
| φ5.00 | 235 | 950 | 95:11 is disconnected | No requirement (NR) |
| φ5.00 | 315 | 900 | 70:15 is disconnected | No requirement (NR) |
| φ5.00 | 647 | 760 | 50:01 is disconnected | 4.8 |
Table 9: the instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | 715 | 8 | 19.5 |
Embodiment 4
The concrete fusion process of melting K417G alloy D is identical with fusion process among the embodiment 1, and the K417 returns are two kinds of discrepant slightly K417 returns 1 of composition and K417 returns 2 in the raw material, and wherein the concrete composition of each alloy is seen table 10:
Table 10:
K417G alloy D to being smelted into carries out the test of warm enduring quality and the instantaneous performance of high temperature, and its result sees table 11, table 12 respectively:
Table 11: high temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | The unit elongation technical qualification |
| φ5.00 | 235 | 950 | 70:42 is not disconnected | No requirement (NR) |
| φ5.00 | 315 | 900 | 90:30 is not disconnected | No requirement (NR) |
| φ5.00 | 647 | 760 | 63:44 is disconnected | 4.0 |
Table 12: the instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | 730 | 8 | 19.5 |
Embodiment 5
The concrete fusion process of melting K417G alloy E is identical with fusion process among the embodiment 1, and the K417 returns are two kinds of discrepant slightly K417 returns 3 of composition and K417 returns 4 in the raw material, and wherein the concrete composition of each alloy is seen table 13:
Table 13:
K417G alloy D to being smelted into carries out the test of warm enduring quality and the instantaneous performance of high temperature, and its result sees, sees table 14, table 15 respectively:
Table 14: high temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | The unit elongation technical qualification |
| φ5.00 | 235 | 950 | 60:30 is not disconnected | No requirement (NR) |
| φ5.00 | 315 | 900 | 90:30 is not disconnected | No requirement (NR) |
| φ5.00 | 647 | 760 | 100:01 is disconnected | 6.8 |
Table 15: the instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | 695 | 8.5 | 12 |
And following for the performance index of K417G alloy:
High temperature endurance performance
| The size of sample (φ mm) | Proof stress (MPa) | Test temperature (℃) | Test period (h:min) | The unit elongation technical qualification |
| φ5.00 | 235 | 950 | ≥40 | No requirement (NR) |
| φ5.00 | 315 | 900 | ≥70 | No requirement (NR) |
| φ5.00 | 647 | 760 | ≥23 | ≥2 |
The instantaneous performance of high temperature
| Test temperature (℃) | Soaking time (min) | Breakdown point (MPa) | Relative elongation δ 5% | Relative reduction in area ψ % |
| 900 | 20 | ≥637 | ≥6.0 | ≥8.0 |
This shows that the K417G alloy property of embodiment 1 ~ 5 melting has all reached index request.
Claims (3)
1. method with K417 alloy returns melting K417G alloy is characterized in that: with the composition of Co in the K417 revert alloy reduce by 5%, the composition of Ti reduces by 0.3%, concrete melting step is following,
---melting K417 alloy: after the surface of K417 alloy returns carried out blast cleaning, adopt vacuum induction melting to become returns one defective material ingot;
---the melting master alloy: this master alloy food ingredient (wt%) as follows, C 0.07 ~ 0.08, Al 4.92 ~ 5.30, Co 4.83 ~ 4.96, Cr 8.72 ~ 9.26, Mo 2.76 ~ 3.1, Zr 0.064 ~ 0.073, B 0.014 ~ 0.02, Ti 4.41 ~ 4.46, V 0.65 ~ 0.75, Ni surplus; The above element of getting corresponding proportion is put into vacuum induction furnace and is smelted into intermediate alloy ingot;
---melting K417G alloy: get part by weight such as above-mentioned K417 alloy returns one defective material ingot and intermediate alloy ingot respectively and mix; Add the adjustment composition behind the chemical analysis and add element; After reaching K417G alloy standard, put into vacuum induction furnace and carry out melting, finally be smelted into the K417G alloy.
2. according to the said method with K417 alloy returns melting K417G alloy of claim 1, it is characterized in that: the concrete technological process of the melting of said master alloy is following,
---change the clear stage: behind the master alloy ingredient composition; The whole Cr+ of the whole Mo+ of the whole Co+ of about 2/3Ni+1/6 C+ that pack into successively from bottom to up residue Ni vacuumizes vacuum oven then, when vacuum tightness≤0.67Pa; Begin vacuum oven is heated; Continue vacuum oven is vacuumized molten steel temperature＜1530 ℃ ± 10 ℃, vacuum tightness≤10.66Pa simultaneously;
---refining stage: require the vacuum tightness≤1.33Pa of vacuum oven, when molten steel temperature is 1530 ℃ ± 10 ℃, fall power to 80kW, add 1/6 C again, the concise time is 20min～30min, stops heating, freezing treatment 20min～30min;
---the alloying stage 1: vacuum oven is continued heating, and vacuum degree control is at≤0.67Pa, and is high-power behind film, slowly adds alloy element; When temperature is 1420 ℃～1450 ℃, reduce power to 80kW, at first add 2/3C; Treat to add V-Al, Al, Ti successively behind the C fine melt, the whole Al 2min～5min consuming time that adds is heated to power 130kW to induction furnace again and stirs; And the crucible 2～3 times of fascinating, when temperature reaches 1550 ℃～1570 ℃, stop to heat 7min～8min;
---the alloying stage 2: after in vacuum oven, adding CrB and Zr element, continue heating, when temperature reaches 1530 ℃～1560 ℃, stop heating, freezing treatment 30min～35min;
---the cast stage: send electric 180kW, vacuum oven is continued heating towards film, when molten steel temperature is 1450 ℃ ± 10 ℃, pour into a mould, pouring speed is at 1min～2min, and the cast back obtains master alloy in the final melting of vacuum oven internal cooling 10min～20min.
3. according to the said method with K417 alloy returns melting K417G alloy of claim 1, it is characterized in that: the concrete technological process of the melting of said K417G alloy is following,
---change the clear stage: with K417 alloy returns ingot+master alloy material ingot+add crucible that element is put into vacuum oven; Then vacuum oven is vacuumized; When vacuum tightness≤0.67Pa, vacuum oven is heated, continue to vacuumize; Require molten steel temperature＜1530 ℃ ± 10 ℃, vacuum tightness≤10.66Pa;
---refining stage: require the vacuum tightness≤1.33Pa of vacuum oven, when temperature is 1530 ℃ ± 10 ℃, send power 80kW to get into refining, add whole C refining period, the phase stops heating, freezing treatment 25min～30min after carrying out refining 20min～30min;
---the cast stage: the molten steel temperature in vacuum oven is 1450 ℃ ± 10 ℃ to be poured into a mould, and pouring speed is controlled at 1min～2min, and the cast back gets the K417G alloy in the final melting of vacuum oven internal cooling 10min～20min.
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| CN102965535A (en) * | 2012-11-15 | 2013-03-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414 |
| CN105420524A (en) * | 2015-11-11 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing K424 cast superalloy through K417G and DZ417G alloy returns |
| CN111910095A (en) * | 2020-08-05 | 2020-11-10 | 浙江省科创新材料研究院 | Smelting preparation method of nickel-based single crystal superalloy master alloy |
| CN114369736A (en) * | 2021-12-17 | 2022-04-19 | 北京科技大学 | A kind of superalloy and smelting process for improving the use ratio of return material |
| CN114892012A (en) * | 2022-04-25 | 2022-08-12 | 中国航发成都发动机有限公司 | Remelting purification method of nickel-based superalloy return material |
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| CN101709387A (en) * | 2009-11-27 | 2010-05-19 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for smelting nickel-based high temperature recycled alloy K3030 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102965535A (en) * | 2012-11-15 | 2013-03-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414 |
| CN102965535B (en) * | 2012-11-15 | 2014-12-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414 |
| CN105420524A (en) * | 2015-11-11 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing K424 cast superalloy through K417G and DZ417G alloy returns |
| CN111910095A (en) * | 2020-08-05 | 2020-11-10 | 浙江省科创新材料研究院 | Smelting preparation method of nickel-based single crystal superalloy master alloy |
| CN111910095B (en) * | 2020-08-05 | 2021-06-01 | 浙江省科创新材料研究院 | Smelting preparation method of nickel-based single crystal superalloy master alloy |
| CN114369736A (en) * | 2021-12-17 | 2022-04-19 | 北京科技大学 | A kind of superalloy and smelting process for improving the use ratio of return material |
| CN114892012A (en) * | 2022-04-25 | 2022-08-12 | 中国航发成都发动机有限公司 | Remelting purification method of nickel-based superalloy return material |
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