CN103143678B - Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade - Google Patents
Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade Download PDFInfo
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- CN103143678B CN103143678B CN201310110695.4A CN201310110695A CN103143678B CN 103143678 B CN103143678 B CN 103143678B CN 201310110695 A CN201310110695 A CN 201310110695A CN 103143678 B CN103143678 B CN 103143678B
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Abstract
The invention provides a formwork for optimizing a directional columnar crystal structure of a high-temperature alloy blade, and the formwork is used in a directional solidification device. Seeding columns are arranged between the bottom of a protruded part of a blade edge plate on the formwork and the top of a water-cooled chassis in a crystal growth direction, cavities are formed inside the seeding columns and are communicated with an inner cavity of the formwork, and a plurality of seeding columns are uniformly arranged in parallel and correspond to the cross section of the protruded part of the blade edge plate. According to the formwork disclosed by the invention, by virtue of a directional column crystal seeding technology, the high-temperature alloy blade produced by a directional solidification technology has a columnar crystal structure which grows axially; and as a harmful transverse crystal boundary is eliminated, high-temperature performance is obviously improved in comparison with an isometric crystal structure produced by a common precision casting method. After pouring, the seeding columns can be used for transferring heat of the edge plate vertically downwards, and simultaneously, the directional solidification process inside the columns can extend to the inside of the edge plate, so that the good columnar crystal structure is also formed in the edge plate.
Description
Technical field
The present invention relates to the hot investment casting of high-temperature alloy part, specifically for a kind of formwork optimizing its directional columnargrain tissue of high temperature alloy cylindrulite vane manufacturing.
Background technology
As shown in Figure 1, when manufacturing the high-temperature alloy blades of directional solidification columnar structure, need carry out in special device for directionally solidifying.First, ceramic shell mould 1 is placed in water-cooled chassis 5, then heater is preheating to more than alloy high-temp alloy; Then, in ceramic shell mould 1, pour into the high temperature alloy melt 2 after fusing, first the Quench that the high temperature alloy melt 2 of the bottom of ceramic shell mould 1 is subject to water-cooled chassis 5 solidifies.Enter cooling zone, high temperature alloy melt 2 directional solidification from bottom to top in ceramic shell mould 1, the crystal grain oriented growth from bottom to top of high-temperature alloy casting 3 along with heat spreads out of with ceramic shell mould 1 decline downwards, form the columanar structure of capwise.
But in the listrium part of blade, the cross section due to high-temperature alloy casting 3 laterally becomes suddenly large, and heat can not spread out of vertically downward, and directional solidification is destroyed, and thus generates thick external stray crystal crystal grain 4-1 and 4-2.The external stray crystal crystal grain 4-1 of these listrium parts and 4-2 coarse grains, crystal orientation are bad, destroy blade capwise columanar structure, its performance is had a strong impact on; External stray crystal crystal grain 4-1 and 4-2 even also can obliquely grow into the blade blade part of high-temperature alloy casting 3, causes larger impact.The particularly large-scale blade of heavy combustion engine, external stray crystal crystal grain 4-1 and 4-2 at listrium position is especially obviously outstanding, and problem is even more serious.
Summary of the invention
The object of the invention is to: a kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue is provided, blade listrium position can be made to form desirable columnar structure.
The technical solution adopted in the present invention is:
A kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue, use in device for directionally solidifying, bottom blade listrium protuberance position on described formwork and be provided with seeding post between water-cooled chassis top, this seeding post is arranged along crystal growth direction, there is cavity seeding post inside, and the internal cavities of seeding post and formwork internal cavities through.
Described seeding post is some, and the sectional uniform of corresponding blade listrium protuberance position arranges, is parallel to each other.
The beneficial effect that the present invention produces is:
Formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention, adopt directional columnargrain seeding, the high-temperature alloy blades utilizing directional solidification processes to produce has the columnar structure grown vertically, owing to eliminating harmful transverse grain boundaries, the equiaxed grain structure that high-temperature behavior is produced compared with common casting method has had and has significantly improved.
According to the present invention, between listrium ledge and water-cooled chassis, the seeding post of some and respective shapes in interpolation.As the extention of foundry goods, seeding post must be stained with corresponding wax bar when assembling wax-pattern, drenches sand and makes formwork, form cavity after dewaxing by mucilage.After cast, seeding post plays a part the heat of listrium to spread out of vertically downward, and the directional solidification process simultaneously in post can be extended in listrium, makes listrium also form good columnar structure.
Accompanying drawing explanation
Fig. 1 is the directional solidification processes schematic diagram of existing high-temperature alloy blades;
Fig. 2 is the directional solidification processes schematic diagram of high-temperature alloy blades of the present invention.
Number in the figure represents: 1, ceramic shell mould, 2, high temperature alloy melt, 3, high-temperature alloy casting, 4, external stray crystal crystal grain, 5, water-cooled chassis, 6, columanar structure, 7, seeding post.
Detailed description of the invention
As shown in Figure 2, the present invention is a kind of formwork for optimizing high-temperature alloy blades directional columnargrain tissue, uses in device for directionally solidifying, and in this detailed description of the invention, formwork is ceramic shell mould 1.Bottom blade listrium protuberance position on formwork (ceramic shell mould 1) and the seeding post 7 of some and respective shapes is set between water-cooled chassis 5 top.Seeding post 7 is arranged along crystal growth direction, and seeding post 7 forms cavity in formwork, through with the internal cavities of formwork (ceramic shell mould 1).According to the growth needs of high-temperature alloy casting 3, seeding post 7 can be made into cylindricality, block shape or plate shape, also can be made into the slice shape of multiple dispersion or bunchy, to make the shell process processed of formwork of the present invention (mucilage pouring sand) as far as possible few influenced.Some, seeding post 7, the sectional uniform of corresponding blade listrium protuberance position arranges, is parallel to each other.
In this detailed description of the invention, high temperature alloy melt 2 after fusing is cast in after in ceramic shell mould 1, seeding post 7 plays a part the heat of blade listrium protuberance position to spread out of vertically downward, the directional solidification process of seeding post 7 internal cavities can be extended to blade listrium protuberance position simultaneously, makes blade listrium protuberance position also form good columanar structure 6.Concrete: when using the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention to carry out the directional solidification of high temperature alloy, from water-cooled chassis 5, orientation grown crystal cast bar equably from bottom to up in the internal cavity of seeding post 7-1 and 7-2, and the ceramic shell mould 1 extending to blade listrium protuberance position is inner, make the high-temperature alloy casting 3 of blade listrium protuberance position for crystal orientation is good, crystal grain is little and uniform directional solidification columanar structure 6.
The preparation method of the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention is very simple, and committed step is wax-pattern assembling procedure, specific as follows:
First, by corresponding seeding wax post, between the listrium inserting the blade wax mould assembled and base plate.Now, should ensure that listrium place obtains desirable columnar structure, also will consider machined surface and cutting problem.Seeding post 7 as the extention of ceramic shell mould 1, must when assembling wax-pattern, to use and the wax bar of seeding post 7 same size is bonded in blade wax mould.
Then, making formwork (be stained with slurry, drench sand, dewaxing, sintering) according to common fine casting method, the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention can being obtained.Concrete, the wax bar of seeding post 7 drenches sand by mucilage makes formwork, forms the cavity of seeding post 7 after dewaxing.
Before the use, first preheating in vacuum drying oven is also incubated roasting, and then use heat conduction formwork to carry out cast and the directional solidification of high-temperature metal alloys sample to formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention.
The method using the formwork for optimizing high-temperature alloy blades directional columnargrain tissue of the present invention to carry out directional solidification is identical with the directional solidification processes of general high-temperature alloy blades, just when clearing up high-temperature alloy casting 3, need seeding post chamber to form the excision of crystal cast bar.
Claims (2)
1. one kind for optimizing the formwork of high-temperature alloy blades directional columnargrain tissue, use in device for directionally solidifying, it is characterized in that: bottom the blade listrium protuberance position on described formwork and be provided with seeding post between water-cooled chassis top, this seeding post is arranged along crystal growth direction, there is cavity seeding post inside, and the internal cavities of seeding post and formwork internal cavities through; Seeding post is the slice shape of cylindricality, block shape or bunchy; After the high temperature alloy melt cast after fusing is in formwork, high temperature alloy melt from bottom to top directional solidification becomes the high temperature alloy body of casting; Simultaneously, from water-cooled chassis, orientation grown crystal cast bar equably from bottom to up in the internal cavity of seeding post, and the formwork extending to blade listrium protuberance position is inner, the high-temperature alloy casting of blade listrium protuberance position is made to be that crystal orientation is good, crystal grain is little and uniform directional solidification columanar structure; When clearing up high-temperature alloy casting, need seeding post chamber to form the excision of crystal cast bar.
2. the formwork for optimizing high-temperature alloy blades directional columnargrain tissue according to claim 1, is characterized in that: described seeding post is some, and the sectional uniform of corresponding blade listrium protuberance position arranges, is parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310110695.4A CN103143678B (en) | 2013-04-01 | 2013-04-01 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310110695.4A CN103143678B (en) | 2013-04-01 | 2013-04-01 | Formwork for optimizing directional columnar crystal structure of high-temperature alloy blade |
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| CN103143678A CN103143678A (en) | 2013-06-12 |
| CN103143678B true CN103143678B (en) | 2015-02-18 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103894547B (en) * | 2014-03-26 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | With the casting method of listrium Blade roughcast |
| CN103894546B (en) * | 2014-03-26 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | The casting method of the concavo-convex intricate casting in end |
| CN104289674B (en) * | 2014-10-24 | 2016-09-14 | 东方电气集团东方汽轮机有限公司 | Gas turbine cylindrulite guide vane casting method |
| CN104353785B (en) * | 2014-10-31 | 2016-06-29 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of directional solidification blade wax-pattern combination inserted chassis and preparation method thereof |
| CN104399894A (en) * | 2014-12-15 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Wax tree structure applied to formation of high-temperature alloy single-crystal guide vane |
| CN104826983B (en) * | 2015-04-08 | 2017-12-29 | 北京仁创科技集团有限公司 | A kind of alkalescent phenol resin old sand and its renovation process |
| CN105057589B (en) * | 2015-07-16 | 2017-05-17 | 西安航空动力股份有限公司 | Method for increasing number of directionally solidified blade column crystals |
| CN106734907B (en) * | 2016-11-25 | 2018-11-30 | 中航动力股份有限公司 | A kind of directional solidification cylindrulite and single crystal blade casting method |
| CN106734852B (en) * | 2016-12-22 | 2019-05-21 | 中国科学院金属研究所 | A kind of preparation method of the cooling directional solidification ceramic shell of anti-sticking tin liquid metal |
| CN107983911A (en) * | 2017-12-06 | 2018-05-04 | 安徽应流航源动力科技有限公司 | A kind of method for the position crystallite dimension that become larger suddenly using the thick big position of wax-pattern structure preparation improvement orientation casting or section |
| CN113976824B (en) * | 2021-10-20 | 2023-09-15 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for preventing mixed crystals from being generated at free end of conjuncted single crystal guide blade core |
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| US3908733A (en) * | 1973-10-26 | 1975-09-30 | United Technologies Corp | Method and apparatus for control of alloy in columnar grain castings |
| GB2259660A (en) * | 1991-09-17 | 1993-03-24 | Rolls Royce Plc | A mould for casting components |
| JPH07247802A (en) * | 1994-03-10 | 1995-09-26 | Hitachi Ltd | Manufacture of single crystal blade for gas turbine |
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| CN102166643A (en) * | 2011-03-30 | 2011-08-31 | 江苏中欧材料研究院有限公司 | Method for preventing monocrystal blades from having mixed crystal defects |
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| CN103143678A (en) | 2013-06-12 |
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