CN107747120A - In a kind of Ni based single-crystal high-temperature alloys growth course interdendritic away from control method - Google Patents
In a kind of Ni based single-crystal high-temperature alloys growth course interdendritic away from control method Download PDFInfo
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- CN107747120A CN107747120A CN201710992617.XA CN201710992617A CN107747120A CN 107747120 A CN107747120 A CN 107747120A CN 201710992617 A CN201710992617 A CN 201710992617A CN 107747120 A CN107747120 A CN 107747120A
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
- C30B11/006—Controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
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Abstract
The invention discloses interdendritic in a kind of Ni based single-crystal high-temperature alloys growth course away from control method, belong to single crystal super alloy technical field.This method is directed to Ni based single-crystal high-temperature alloys, in directional solidification process, by adjusting dendritic growth path, reach control interdendritic away from purpose.During Ni base single crystal casting Coarsenings, can by change single crystal casting growth pattern adjust interdendritic away from.The present invention by adjust dendritic growth path reach control interdendritic away from purpose, lay the foundation to prepare the mono-crystalline structures part with variable cross-section feature from now on.
Description
Technical field
The present invention relates to single crystal super alloy technical field, and in particular in a kind of Ni based single-crystal high-temperature alloys growth course
Interdendritic away from control method.
Background technology
In order to meet requirement of the advanced aero engine turbo blade to temperature resistant capability, crystal boundary this high temperature weakness is eliminated
The single crystal super alloy of structure, advanced aero engine turbo blade is prepared because its excellent high-temperature behavior has been increasingly becoming
Preferred material.And the design structure and workmanship of single crystal super alloy turbo blade are even more to directly affect holding for aero-engine
Warm ability and overall performance.Make a general survey of the development course of advanced aero engine, single crystal super alloy turbo blade size it is large-scale
Change and complications of structure have become continue to lift up the effective means of aero-engine key hot-end component overall performance with must
Right trend.But it is thick dendrite easily occur with single crystal blade size-enlargement and complicatedization, in single crystal growth process
Greatly, the problems such as causing single crystal blade performance inconsistency, service life to shorten.First, new single crystal blade is complicated, blade wall thickness
It is thin, and cross sectional shape is changeable, causes crystal growth path complicated, growth rate difference is big, easily causes dendrite thick, causes leaf
Piece performance declines.Secondly, the maximization of new single crystal blade size, cause dendritic growth path in directional solidification process elongated,
Particularly in the crystal growth later stage of aqueous cold plate far-end, because the thermograde in dendritic growth direction drastically reduces, it is easier to
Coarsening is caused, causes blade rejection.Therefore, optimize crystal growth mode, adjustment dendritic growth path, control interdendritic away from
Just it is particularly important.
The content of the invention
It is an object of the invention to provide interdendritic in a kind of Ni based single-crystal high-temperature alloys growth course away from control method, should
Method is by controlling interdendritic away from so as to solve in Directional Solidification Process of Single Crystal Superalloys because dendritic growth path change is drawn
The Coarsening problem risen.
To achieve the above object, the technical solution adopted in the present invention is as follows：
In a kind of Ni based single-crystal high-temperature alloys growth course interdendritic away from control method, this method is to be directed to Ni base monocrystalline
High temperature alloy, in its directional solidification process, by adjusting dendritic growth path, realize to interdendritic away from control.
In directional solidification process, when growing the bar samples that sectional dimension is fixed, as specimen cross section size increases,
Interdendritic is away from increase.
In directional solidification process, when growing the sample of variable cross-section, specimen cross section size is with branch during mutational formats increase
Intergranular away from the interdendritic being greater than when specimen cross section size increases in a continuous manner away from.
The diameter of section of the sample is φ 8-16mm.
Complicated, the changeable feature of shape for nickel-based monocrystal casting structure, using rational crystal growth mode, adjust branch
Crystals growth path, can effectively control interdendritic away from.And use irrational crystal growth mode, then interdendritic can be caused away from aobvious
Write roughening.
Advantages of the present invention and have the beneficial effect that：
It is 1st, of the invention by studying the response relation of Ni based single-crystal high-temperature alloy sample physical dimensions and interdendritic away between,
Determine in the case of directional solidification processes are constant, coupon increase transverse width, interdendritic is away from dramatically increasing, Coarsening；And
During coupon broadens, specimen cross section size then can effectively control Coarsening by the way of increasing continuously.
2nd, Ni bases single crystal casting is complicated, and shape is changeable, the thick situation of dendrite easily occurs.It is particularly solidifying in orientation
Gu in the later stage, due to solid liquid interface away from aqueous cold plate apart from increasing, thermograde and cooldown rate are remarkably decreased, and dendrite can be caused notable
Roughening, cause single crystal casting interdendritic away from generation fluctuation.Using optimization single crystal casting growth pattern, dendritic growth path is adjusted,
Reach control interdendritic away from purpose, lay the foundation to prepare the mono-crystalline structures part with variable cross-section feature from now on.
Brief description of the drawings
Fig. 1 is different size coupon schematic diagrames.
Fig. 2 is different size coupon dendrite morphologies.
Fig. 3 be different size single crystal coupons interdendritic away from.
Fig. 4 is the vane simulated part schematic diagram of different growth patterns.
Fig. 5 is the dendrite morphology of the vane simulated part of different growth patterns.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.In following examples, using conventional directional solidification processes, prepare
The various sizes of nickel-base high-temperature single crystal alloy coupon (trade mark：SRR99, AM3, DD5, DD98), study dendritic growth path and branch
Intergranular away from relevance, propose corresponding control method.
As shown in figure 1, in order to study dendrite path to interdendritic away from influence, devising one group has different geometrical size
Coupon.Module mainly includes：Crystal selector, changeover portion and sample.
In order to quantify specimen size, in Fig. 1, several key dimensions of sample are indicated, it is main several including sample
What size and architectural feature.Specific specimen size refers to table 1.
The sample physical dimension of table 1.
(note：Extension refers to specimen cross section size (diameter) to be increased in a continuous manner, is gradually broadened by narrow, continuously refers to sample chi
Very little is consecutive variations；Mutation refers to specimen cross section size (diameter) to be increased with mutational formats, is suddenly change, the section of sample 4 is straight
Footpath increases to 12mm suddenly by 8mm, then increases to 16mm suddenly, without transient process during increase.)
As shown in figure 4, in order to study dendritic growth mode to blade interdendritic away from influence, devising one group has tenon
The simulating piece of the typical blade structure such as head, listrium, blade.
Embodiment 1：
As shown in Fig. 2 under conditions of directional solidification processes are constant, as specimen size difference causes dendritic growth path
Difference, cause in monocrystalline coupon interdendritic away from also different.As shown in figure 3, dendrite grows in the sample 1 that size is φ 8
When, dendrite is thin and fine and close, and dendrite is spaced about 246 μm；When dendrite grows in the sample 2 that size is φ 16, dendrite is notable
Roughening, dendrite are spaced about 297 μm；When being grown during dendrite is the samples 3 that continuously extend of φ 8-16 in size, dendrite morphology with
Similar in sample 3, dendrite is spaced about 287 μm；When dendrite grows in the sample 4 that size is φ 8-16 mutation extensions, branch
Brilliant thicker, dendrite is spaced about 330 μm.In specimen size in the range of φ 8-16mm, as specimen size increases, dendrite
Spacing increase；Interdendritic caused by the unexpected increase of specimen size is greater than specimen size away from increasing degree and increased continuously.Therefore, lead to
Cross change dendritic growth path can reach control interdendritic away from purpose.
Embodiment 2：
According in embodiment 1, dendrite in different growth cracks interdendritic away from difference, monocrystalline is given birth in adjustment simulation blade
Long mode, from tenon in the upper tenon that is changed under, as shown in Figure 4.Because growth pattern is different, in blade interdendritic away from there is also
Marked difference.Fig. 5 is the dendrite morphology of the vane simulated part of different growth patterns.Vane simulated part of the tenon in upper growth pattern
In, dendrite more refines and densification, dendrite are spaced about 280 μm；Tenon in the vane simulated part of lower growth pattern, dendrite compared with
To be thick, dendrite is spaced about 300 μm.Therefore, by changing vane simulated part growth pattern, can reach control interdendritic away from
Purpose.
Claims (5)
1. in a kind of Ni based single-crystal high-temperature alloys growth course interdendritic away from control method, it is characterised in that：This method is pin
To Ni based single-crystal high-temperature alloys, in its directional solidification process, by adjusting dendritic growth path, realize to interdendritic away from control
System.
2. in Ni based single-crystal high-temperature alloys growth course according to claim 1 interdendritic away from control method, its feature
It is：In directional solidification process, when growing the bar samples that sectional dimension is fixed, with the increase of specimen cross section size, branch
Intergranular is away from increase.
3. in Ni based single-crystal high-temperature alloys growth course according to claim 1 interdendritic away from control method, its feature
It is：In directional solidification process, when growing the sample of variable cross-section, specimen cross section size is with interdendritic during mutational formats increase
Away from the interdendritic being greater than when specimen cross section size increases in a continuous manner away from.
4. in the Ni based single-crystal high-temperature alloy growth courses according to Claims 2 or 3 interdendritic away from control method, it is special
Sign is：The diameter of section of the sample is φ 8-16mm.
5. in the Ni based single-crystal high-temperature alloy growth courses according to Claims 2 or 3 interdendritic away from control method, it is special
Sign is：In Ni based single-crystal high-temperature alloy growth courses, by changing the growth pattern of single crystal casting, so as to adjust dendrite life
Long path, realize interdendritic away from control.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021196713A1 (en) * | 2020-03-30 | 2021-10-07 | 上海交通大学 | Substrate-triggered directional solidification process for single crystal superalloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994150A (en) * | 2010-10-15 | 2011-03-30 | 镇江忆诺唯记忆合金有限公司 | Method for deciding directional solidification primary dendrite arm spacing by controlling temperature gradient |
| CN104690256A (en) * | 2015-02-11 | 2015-06-10 | 西北工业大学 | Directional solidification method for controlling foreign crystal defects of nickel-base superalloy step cast |
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2017
- 2017-10-23 CN CN201710992617.XA patent/CN107747120B/en active Active
Patent Citations (2)
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|---|---|---|---|---|
| CN101994150A (en) * | 2010-10-15 | 2011-03-30 | 镇江忆诺唯记忆合金有限公司 | Method for deciding directional solidification primary dendrite arm spacing by controlling temperature gradient |
| CN104690256A (en) * | 2015-02-11 | 2015-06-10 | 西北工业大学 | Directional solidification method for controlling foreign crystal defects of nickel-base superalloy step cast |
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| 史振学 等: "铸件尺寸对镍基单晶高温合金力学性能的影响", 《金属铸锻焊技术》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021196713A1 (en) * | 2020-03-30 | 2021-10-07 | 上海交通大学 | Substrate-triggered directional solidification process for single crystal superalloy |
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