CN106119748B - A method of prevent DD99 alloy monocrystalline blade from generating incipient melting defect - Google Patents
A method of prevent DD99 alloy monocrystalline blade from generating incipient melting defect Download PDFInfo
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- CN106119748B CN106119748B CN201610771226.0A CN201610771226A CN106119748B CN 106119748 B CN106119748 B CN 106119748B CN 201610771226 A CN201610771226 A CN 201610771226A CN 106119748 B CN106119748 B CN 106119748B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention provides a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect.The present invention is to increase pretreating process in DD99 alloy monocrystalline blade high-temperature heat treatment process, and pretreatment is to take a temperature to be kept the temperature between 10 DEG C below~25 DEG C for the treatment of temperature, to eliminate low melting point eutectic phase inside alloy in advance.When using carrying out blade high-temperature heat treatment after pretreatment again, since eutectic comparision contents are few inside alloy, the initial melting temperature of alloy is improved, the generation of single crystal blade incipient melting defect is avoided.
Description
Technical field
The present invention relates to precision-investment castings and single crystal blade vacuum heat treatment field, and in particular to one kind prevents DD99 from closing
The method that golden single crystal turbine blade generates incipient melting defect.
Background technique
DD99 is a kind of nickel base cast single crystal super alloy, belongs to first generation single crystal super alloy.Alloy density is lower, tool
There are high creep strength and fatigue behaviour, good single crystal casting performance, wider solid solution temperature range, and has good
Structure stability.The moving turbine blade with complicated inner cavity for being suitble to 1050 DEG C of manufacture or less to work and 1100 DEG C or less work
The guide vane of work.
Incipient melting refer to alloy in process of setting due to segregation formed intergranular or interdendritic low melting point phase, afterwards plus
In thermal process, alloy is occurring below part a small amount of the phenomenon that melting lower than solidus temperature.This incipient melting defect not only reduces
The mechanical property of single crystal blade if incipient melting reaches certain amount will lead to single crystal blade and scrap by the gross.
For DD99 alloy monocrystalline moving turbine blade, to guarantee that single crystal superalloy blades have good comprehensive mechanical property
Can, the temperature of solution treatment is higher, reaches 1300 ± 10 DEG C, the fusion temperature of very close alloy, after solution treatment easily
Generate incipient melting defect.
It is special in the China of Publication No. CN105502888A (title: the process units and its production method of the first fusant of glass)
In benefit, provide a service life it is longer and be not susceptible to because platinum ion introduce due to make the glass of glass coloration at the beginning of fusant production
Device.It melts glass raw material using radiant heating, and is kept away by the way of raw material runner glass layer formed on surface using cooling
Exempt from directly to contact raw material runner inner wall in melting process of raw material, so that the introducing of coloring ion be reduced or avoided, improves optics
Glass transmitance.The patent is the process units that the first fusant of glass is generated for glass raw material, and prevents DD99 alloy monocrystalline whirlpool
The problem of method that impeller blade generates incipient melting defect when vacuum high-temperature is heat-treated is different, belongs to two different fields.
In the Chinese patent of Publication No. CN101337723B (a kind of title: first fusing device of flocculation powder), one is disclosed
The first fusing device of kind flocculation powder, including upper cavity, lower chamber, distributing disc, the upper hose spray head and downcomer linked with outer water tube
Spray head.Its time for contacting flocculation powder with water and number are more, and the dissolution for the powder that more conducively flocculates, the powder that makes to flocculate is in first fusing device
It is middle adequately to be dissolved.The patent is a kind of device having invented the powder that makes to flocculate and adequately having been dissolved in first fusing device,
It is different from DD99 alloy monocrystalline turbo blade generation method of incipient melting defect when vacuum high-temperature is heat-treated is prevented, belong to two not
The problem of same domain.
Currently, there is not yet solving the report that DD99 alloy monocrystalline turbo blade generates incipient melting defect problem in heat treatment
Road.
Summary of the invention
The purpose of the present invention is to provide a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect, Ke Yiti
The structure property of high DD99 alloy monocrystalline turbo blade reduces part loss due to spoiled work.
In order to achieve the above objectives, the invention adopts the following technical scheme:
Method includes the following steps:
During being heat-treated to the DD99 alloy monocrystalline blade through coagulation forming, with the first of the heat treatment
Treatment temperature is benchmark temperature, if fiducial temperature is equal to the initial melting temperature of the DD99 alloy monocrystalline blade or fiducial temperature is less than
The initial melting temperature and difference of the DD99 alloy monocrystalline blade are no more than 80 DEG C, then lower than 10~25 DEG C of the fiducial temperature
Temperature is control temperature, in the temperature-rise period of the heat treatment early period, by being kept the temperature when being warming up at control temperature,
It eliminates or reduces eutectic phase existing for the DD99 alloy monocrystalline blade interior as far as possible, be then warming up at fiducial temperature again simultaneously
Start the subsequent step of the heat treatment.
The temperature of the heat preservation is 1270~1290 DEG C.
The time of the heat preservation is 100~120min.
The heat treatment is that vacuum solid solution is handled.
The method specifically includes the following steps:
1) by the DD99 alloy monocrystalline blade cleaning it is clean after be put into vacuum heat treatment furnace；
2) after step 1), furnace temperature is risen to 1000~1200 DEG C with 10~12 DEG C/min, and keep the temperature 25~40min；
3) after step 2), furnace temperature is risen to 1270~1290 DEG C with 2~5 DEG C/min, and keep the temperature 100~130min；
4) after step 3), furnace temperature is risen to 1290~1310 DEG C with 1~3 DEG C/min, and keep the temperature 60~70min；
5) after step 4), furnace temperature is down to 80 DEG C or less under inert gas atmosphere.
Holding temperature in the step 3) is lower than 10~25 DEG C of holding temperature in step 4).
The step 1) specifically includes the following steps:
1.1) the DD99 alloy monocrystalline blade is cleaned with acetone or industrial alcohol, naturally dry after cleaning；
1.2) it is put into vacuum heat treatment furnace after natural drying, charging temperature is not more than 50 DEG C.
The inert gas is selected from argon gas.
The vacuum degree of the vacuum heat treatment furnace controls in vacuum solid solution processing≤1 × 10-2Pa。
The beneficial effects of the present invention are embodied in:
The present invention is to increase pretreating process in DD99 alloy monocrystalline blade high-temperature heat treatment process, and pretreatment is in heat
A temperature is taken to be kept the temperature between 10 DEG C below~25 DEG C for the treatment of temperature, to eliminate low melting point eutectic inside alloy in advance
Phase.When using carrying out blade high-temperature heat treatment after pretreatment again, since eutectic comparision contents are few inside alloy, alloy is improved
Initial melting temperature avoids the generation of single crystal blade incipient melting defect.
Further, the present invention is directed to the blade vacuum solution treatment of DD99 alloy monocrystalline, increases 1270~1290 DEG C of guarantors
The pretreating process of 100~130min of temperature, the experimental results showed that, the generation of blade incipient melting defect can be effectively avoided.
Detailed description of the invention
Fig. 1 is the metallograph of generation incipient melting defect after the blade solution treatment of DD99 alloy monocrystalline.
Fig. 2 is the metallograph of incipient melting detection after the blade solution treatment of DD99 alloy monocrystalline.
Specific embodiment
It elaborates with reference to the accompanying drawings and examples to the present invention.
The present embodiment is that one kind prevents certain engine DD99 alloy monocrystalline high pressure two-stage turbine working-blade in vacuum solid solution
The method of incipient melting defect is generated when processing.The DD99 alloy monocrystalline high pressure two-stage turbine working-blade is the pass of certain engine
Key part is the lifetime piece of the engine.The blade is the solid vane with integral shroud, and blade is elongated, and chord width is bigger, is vented side
Thickness is only 0.51mm.
When the blade pre-processes in solid solution treatment process without increasing, the vanes Physico-chemical tests after solution treatment, leaf
There is different degrees of incipient melting defect in piece blade, listrium and tenon root surface, beyond the requirement of blade acceptance criteria, lead to blade rejection
(referring to Fig. 1).
The present embodiment use with pretreating process high temperature (solution treatment controlled at 1300 DEG C, blade it is first molten
Temperature is 1370 DEG C) detailed process of solution treatment is:
Step 1: being cleaned with acetone (analysis is pure) or industrial alcohol to blade, oil stain and the dirt of blade surface are washed away
Object, the blade after cleaning answer naturally dry.
Step 2: the blade of naturally dry, which (guarantees that blade enters stokehold and do not polluted again) in 30min, is put into Vacuum Heat
In treatment furnace, charging temperature (referring to furnace temperature) is not more than 50 DEG C.
Step 3: furnace temperature is risen to 1100 DEG C with 12 DEG C/min, 30 ± 5min is kept the temperature at 1100 DEG C ± 10 DEG C.
4th step (pretreatment): rising to 1280 DEG C for furnace temperature with 3 DEG C/min, at 1280 DEG C ± 10 DEG C keep the temperature 120 ±
10min。
Step 5: furnace temperature is risen to 1300 DEG C with 1.5 DEG C/min, 60 ± 10min is kept the temperature at 1300 DEG C ± 10 DEG C.
Step 6: opening argon gas, fan coolling to 80 DEG C hereinafter, coming out of the stove.
Above-mentioned steps three are into step 5, vacuum degree≤1 × 10 in furnace-2Pa。
After the present embodiment uses the higher temperature solid solution with pretreating process, DD99 alloy monocrystalline high pressure two-stage turbine work
Make that blade interior eutectic comparision contents are few, and initial melting temperature will effectively improve.Referring to fig. 2, from the gold of blade Physico-chemical tests
Phase photo can be seen that the intact and blade blade of blade interior tissue solid solution, listrium and tenon root surface and have no that (incipient melting lacks just fusing point
Fall into), the stain in Fig. 2 is microporosity defect, is met the requirements of the standard.Therefore monocrystalline leaf can be eliminated by pretreatment appropriate
Low melting point phase inside piece alloy improves alloy initial melting temperature, prevents single crystal blade from generating incipient melting defect.
Claims (4)
1. a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect, it is characterised in that: this method includes following step
It is rapid:
1) by the DD99 alloy monocrystalline blade cleaning it is clean after be put into vacuum heat treatment furnace；
2) after step 1), furnace temperature is risen to 1000~1200 DEG C with 10~12 DEG C/min, and keep the temperature 25~40min；
3) after step 2), furnace temperature is risen to 1270~1290 DEG C with 2~5 DEG C/min, and keep the temperature 100~130min；
4) after step 3), furnace temperature is risen to 1290~1310 DEG C with 1~3 DEG C/min, and keep the temperature 60~70min；
5) after step 4), furnace temperature is down to 80 DEG C or less under inert gas atmosphere.
2. a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect according to claim 1, it is characterised in that:
The step 1) specifically includes the following steps:
1.1) the DD99 alloy monocrystalline blade is cleaned with acetone or industrial alcohol, naturally dry after cleaning；
1.2) it is put into vacuum heat treatment furnace after natural drying, charging temperature is not more than 50 DEG C.
3. a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect according to claim 1, it is characterised in that:
The inert gas is argon gas.
4. a kind of method for preventing DD99 alloy monocrystalline blade from generating incipient melting defect according to claim 1, it is characterised in that:
The vacuum degree control of the vacuum heat treatment furnace is ≤1 × 10-2Pa。
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| CN201610771226.0A CN106119748B (en) | 2016-08-29 | 2016-08-29 | A method of prevent DD99 alloy monocrystalline blade from generating incipient melting defect |
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| CN113005379A (en) * | 2019-12-20 | 2021-06-22 | 佛山科学技术学院 | Heat treatment method of nickel-based single crystal superalloy |
| CN114134294A (en) * | 2021-08-31 | 2022-03-04 | 苏州翰微材料科技有限公司 | Stress relief annealing process for inhibiting recrystallization of nickel-based single crystal superalloy turbine blade |
Citations (4)
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|---|---|---|---|---|
| CN87102762A (en) * | 1986-04-09 | 1987-10-21 | 联合工艺公司 | The solution heat treatment of the speed change heating of superalloy foundry goods |
| CN101089215A (en) * | 2006-06-16 | 2007-12-19 | 中国科学院金属研究所 | High strength antithermal corrosion low segregation directional high temp alloy |
| CN104611656A (en) * | 2013-11-04 | 2015-05-13 | 沈阳工业大学 | Pretreatment process for improving lasting life of [011] orientated-nickel base single crystal high temperature alloy |
| CN104746145A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Heat treatment process of nickel base single crystal superalloy |
-
2016
- 2016-08-29 CN CN201610771226.0A patent/CN106119748B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102762A (en) * | 1986-04-09 | 1987-10-21 | 联合工艺公司 | The solution heat treatment of the speed change heating of superalloy foundry goods |
| CN101089215A (en) * | 2006-06-16 | 2007-12-19 | 中国科学院金属研究所 | High strength antithermal corrosion low segregation directional high temp alloy |
| CN104611656A (en) * | 2013-11-04 | 2015-05-13 | 沈阳工业大学 | Pretreatment process for improving lasting life of [011] orientated-nickel base single crystal high temperature alloy |
| CN104746145A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Heat treatment process of nickel base single crystal superalloy |
Non-Patent Citations (1)
| Title |
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| 热处理对一种镍基单晶高温合金组织及性能的影响;水丽等;《铸造》;20080930;第57卷(第9期);第953-954页 |
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Address after: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee after: AECC AVIATION POWER CO., LTD. Address before: Weiyang Xu Jia Wan 710021 Shaanxi city of Xi'an Province Patentee before: AVIC AVIATION ENGINE CORPORATION PLC |
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