CN114850406A - Preparation process of seed crystal for casting nickel-based single crystal blade with precisely controllable three-dimensional orientation - Google Patents
Preparation process of seed crystal for casting nickel-based single crystal blade with precisely controllable three-dimensional orientation Download PDFInfo
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- CN114850406A CN114850406A CN202210441954.0A CN202210441954A CN114850406A CN 114850406 A CN114850406 A CN 114850406A CN 202210441954 A CN202210441954 A CN 202210441954A CN 114850406 A CN114850406 A CN 114850406A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
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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
- C30B11/14—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method characterised by the seed, e.g. its crystallographic orientation
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Abstract
The invention discloses a preparation process of a seed crystal for casting a three-dimensional orientation-controllable nickel-based single crystal blade, which comprises the steps of designing the shape and the size of a single crystal seed test rod, designing a module, molding, manufacturing a wax module tree, manufacturing a shell, smelting and pouring, post-processing, detecting crystal grains and detecting laue; according to the invention, the shape and size of the single crystal seed test rod are designed, the primary dendrite and the secondary dendrite orientation can be accurately controlled from the wax mold stage, the later cutting orientation is not needed, the crystal orientation is accurate, the integrity of the crystal grain is good, the crystal grain and the laue are qualified for use, the secondary cutting is not needed, the operation steps are simple, the production efficiency is improved, and the method is suitable for the engineering application of producing single crystal blades by the seed crystal method.
Description
Technical Field
The invention relates to the technical field of single crystal alloy precision casting, in particular to a preparation process of a seed crystal for casting a nickel-based single crystal blade with controllable three-dimensional orientation.
Background
With the rapid development of the aviation engine and the gas turbine industry in China, the requirement on the high-temperature mechanical property of key parts is higher and higher, and the coaxial crystal structure superalloy blade is difficult to serve under the working condition. The nickel-based single crystal superalloy has the advantages of high melting point, excellent high-temperature strength and creep resistance and the like, and is increasingly applied to hot end parts of aeroengines and gas turbines. The precision casting process of the nickel-based high-temperature alloy single crystal blade becomes one of the technical bottlenecks which need to be broken through urgently. But it is worth noting that the mechanical property of the nickel-based superalloy single crystal blade has obvious anisotropy, and primary dendrite generated when casting crystal grows
The best thermal fatigue performance is achieved when the <001> crystal orientation is consistent with the direction of the main stress axis of the blade in service, and the secondary dendrite <010> and <100> crystal orientation of the crystal also has a significant effect on the performance of the blade, so it is desirable to be able to precisely control the primary dendrite <001> and secondary dendrite <010> and <100> crystal orientations when preparing single crystal superalloy blades. The preparation of the single crystal high temperature alloy casting mainly applies a directional solidification process, and at present, the method for preparing the single crystal mainly adopts a crystal selection method and a seed crystal method to obtain the single crystal structure of the required alloy. The crystal selection method is characterized in that a large number of randomly oriented crystal grains are generated by mass nucleation at the bottom of a seeding section, and then a single crystal with a primary dendritic crystal (001) orientation deviation angle within a certain range is obtained through competition growth among the crystal grains in the directional solidification process through a crystal selector structure. The seed crystal is prepared through heating seed crystal with excellent orientation measured in advance and mold casing, heating the melt to cast into the mold casing, remelting the top of the seed crystal, starting drawing and epitaxial growth of monocrystal on the surface of the seed crystal during directional solidification, and controlling the orientation of the monocrystal to be consistent with that of the seed crystal, so as to control the orientation of the primary dendritic crystal and secondary dendritic crystal in the casting precisely. Therefore, the seed crystal method can effectively solve the problem that the crystal orientation of the single crystal superalloy can not be accurately controlled by the crystal selection method, but the existing method for industrially preparing the seed crystal comprises the steps of firstly obtaining test blocks with upper and lower parallel sections by machining a single crystal test bar or a test plate for preparing the seed crystal, calibrating primary dendrite orientation by using an X-ray method, then cutting out the test block with the axial direction parallel to the primary dendrite <001> orientation by using a cutting preparation method, calibrating secondary dendrite orientation by using the X-ray method, and preparing the seed crystal by cutting again. Although the method for preparing the seed crystal has low orientation requirement on the original single crystal test bar or test plate, the preparation steps are complicated, the cutting can not be quickly and accurately positioned and cut, the operability is poor, and the method is not suitable for the engineering application of producing the single crystal blade by the seed crystal method.
Disclosure of Invention
The invention mainly aims to provide a preparation process of a seed crystal for casting a nickel-based single crystal blade with controllable three-dimensional orientation, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: the preparation process of the seed crystal for casting the nickel-based single crystal blade with the controllable three-dimensional orientation comprises the following steps:
1) shape and size design of single crystal seed crystal test rod
Manufacturing a single crystal seed crystal test bar, wherein the single crystal seed crystal test bar comprises an initial section, a test bar body and a riser, the axial lead direction of the test bar is a primary dendritic crystal orientation direction, a reference plane F is arranged on the test bar, and a direction B which is parallel to the placement direction of the reference plane F and is vertical to the axis first direction of the test bar is defined, and the direction B is a secondary dendritic crystal orientation direction;
2) modular design
Manufacturing a pouring module which consists of nine parts, namely a single crystal seed test rod, a spiral crystal selector, a pouring cup, an initial section S, a chassis, a pouring system, an upper tie bar, a middle column tube and a reinforcing tie bar;
3) moulding
According to the requirement of pressing a wax mould in a casting process, filling wax to press a single crystal seed crystal test rod wax piece, an initial section S and a chassis wax piece; adopting pouring channel wax to press a wax piece of the pouring system, an upper lacing wire, a reinforcing lacing wire and a middle column pipe wax piece; pressing a sprue cup by using medium-temperature wax, and shaping the single crystal seed crystal test bar wax piece after pressing on a special shaping tool, so that the single crystal seed crystal test bar wax piece is ensured not to deform and the straightness in the axial lead direction is good;
4) wax pattern tree
According to the requirements of model tree assembly, carrying out assembly welding on a single crystal seed crystal test bar wax piece, an initial section S, a chassis wax piece, a pouring system wax piece, an upper tie bar, a reinforcing tie bar, a center pillar pipe wax piece and a pouring cup;
5) shell making
Coating a precision casting shell with the thickness of 5-19mm on the surface of the wax mould module, dewaxing at 130-180 ℃, roasting at 920-980 ℃, and preserving heat for 2-4 hours to ensure that the residual wax is completely combusted to obtain the precision casting ceramic shell for the single crystal;
6) smelting and pouring
Placing the ceramic shell into a heater of a single crystal directional solidification furnace, setting corresponding smelting technological parameters, heating to a shell heat preservation temperature of 1490-minus 1510 ℃, preserving heat for 30min, remelting and pouring a mother alloy ingot into a mould shell after reaching the temperature, setting the pouring temperature at 1500-minus 1520 ℃, standing for 90 seconds after pouring, drawing, setting the crystal pulling rate at 3-5mm/min, and after crystal pulling, cooling with the furnace for 5-7 minutes, breaking vacuum and taking out to prepare a needed single crystal seed crystal test rod blank;
7) post-treatment
According to the casting process requirement, carrying out sand removal, cutting and grain size corrosion, removing a mould shell and floating sand, cutting off an initial section and a dead head of a single crystal seed crystal test bar to obtain a test bar body, positioning, locking and fixing the test bar body by using a clamping tool, moving and cutting a cutting device along a direction vertical to a reference surface F of the single crystal test bar, cutting the single crystal test bar in sections according to the length of the seed crystal sections to obtain a plurality of seed crystal sections, and carrying out grain size corrosion on the seed crystal sections;
8) grain detection, Laue detection
And (3) visually checking the integrity of the cut single crystal seed crystal section subjected to grain corrosion, performing Laue-HT X-ray diffractometer on the seed crystal section, and judging whether the seed crystal with the primary dendrite and the secondary dendrite which deviate from the axial direction is qualified or not according to the Laue-HT X-ray diffractometer.
The shape correcting tool in the step 3) comprises a base plate seat, through grooves are formed in two sides of the base plate seat, a plurality of communicated correcting grooves are formed between the through grooves in the two sides of the base plate seat, single crystal seed crystal test rod wax pieces are placed in the correcting grooves and the through grooves in a matched mode, two adjacent ends of the single crystal seed crystal test rod wax pieces are arranged in a staggered mode, the reference surface F of the single crystal seed crystal test rod wax pieces is flush with the top surface of the base plate seat, a pressing plate is arranged on the top surface of the base plate seat, two ends of the pressing plate are fixed through opening and closing hinges in a compression joint mode, the opening and closing hinges are fixedly connected with two ends of the base plate seat through supports, and the reference surface F of the single crystal seed crystal test rod wax pieces is pressed through the pressing plate, so that the test rod body section of the single crystal seed crystal test rod wax pieces is tightly attached to the shape correcting grooves, and straightness of the axial lead direction of the single crystal seed crystal test rod wax pieces is guaranteed.
In the step 1), a pentagonal groove matched and spliced with the spiral crystal selector is formed in the end face of the initial section, and the direction B is the connecting line direction of a fixed point C of the pentagonal groove and a midpoint D of one side corresponding to the pentagonal fixed point C.
The length of the seed crystal segment in the step 7) is 35mm, and each single crystal test bar is cut into five seed crystal segments.
The requirements for visual inspection of the integrity of the single crystal in step 8) are:
firstly, no visible crystal boundary exists within 15mm from the end surface of one side of the seed crystal;
no equiaxed crystal exists at least within 15mm from one end face of the seed crystal, and equiaxed crystal grains with the diameter less than 0.5mm are not counted;
thirdly, columnar crystals which are not visible in a visual way at least within 15mm from the end surface of one side of the seed crystal;
and fourthly, the inner surface of the seed crystal is at least 15mm from the end surface of one side of the seed crystal, and freckle defects are not allowed to appear.
And 8) polishing and cleaning the surface of the seed crystal section with qualified crystal orientation through Laue detection in the step 8), ensuring that the surface of the seed crystal has no redundant adhesive substances, oil stains, oxide skins and the like, placing the seed crystal section in a wooden box, storing the seed crystal section in a dry storage room for casting the nickel-based single crystal blade, and scrapping the unqualified seed crystal.
The qualified standard in the step 8) is that the orientation deviation of the primary dendrite and the secondary dendrite is within the range of 0-5 degrees.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the shape and size of the single crystal seed test rod are designed, the primary dendrite and the secondary dendrite orientation can be accurately controlled from the wax mold stage, the later cutting orientation is not needed, the crystal orientation is accurate, the integrity of the crystal grain is good, the crystal grain and the laue are qualified for use, the secondary cutting is not needed, the operation steps are simple, the production efficiency is improved, and the method is suitable for the engineering application of producing single crystal blades by the seed crystal method.
Drawings
FIG. 1 is a schematic view of a single crystal seed test rod according to the present invention;
FIG. 2 is a schematic perspective view of the initial section of a single crystal seed test rod of the present invention;
FIG. 3 is a schematic view of the orientation of a single crystal seed test rod of the present invention;
FIG. 4 is a schematic diagram of a module of a single crystal seed test rod according to the present invention;
FIG. 5 is a perspective view of the overall structure of the sizing tool of the present invention;
fig. 6 is a perspective view of a part of the structure of the sizing tool of the present invention.
In the figure: 1. testing a single crystal seed crystal; 101. an initial segment; 102. a test stick body; 103. a riser; 104. a pentagonal groove; 2. a spiral crystal selector; 3. a pouring cup; 4. an initial segment S; 5. a chassis; 6. a pouring system; 7. upwards pulling ribs; 8. a middle column tube; 9. reinforcing the lacing wires; 10. a floor base; 11. a through groove; 12. calibrating the groove; 13. pressing a plate; 14. push-pull type clamp; 15. and (4) a support.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The preparation process of the seed crystal for casting the nickel-based single crystal blade with the controllable three-dimensional orientation comprises the following steps:
1) shape and size design of single crystal seed crystal test rod
As shown in fig. 1, the single crystal seed test rod 1 comprises an initial section 101, a test rod body 102 and a riser 103, wherein the axial lead direction of the single crystal seed test rod 1 is a primary dendrite orientation direction, a reference plane F is arranged on the single crystal seed test rod 1, a direction B parallel to the reference plane F and perpendicular to the axis of the single crystal seed test rod 1 in the first direction is defined, the direction B is a secondary dendrite orientation direction, as shown in fig. 2-3, specifically, a pentagonal groove 104 inserted in the spiral crystal selector 2 is formed in the end face of the initial section 101, and the direction B is a connecting direction of a fixed point C of the pentagonal groove 104 and a side midpoint D corresponding to the pentagonal fixed point C.
2) Modular design
Manufacturing a casting module as shown in fig. 4, the module consists of nine parts, namely a single crystal seed crystal test rod 1, a spiral crystal selector 2, a casting cup 3, an initial section S4, a chassis 5, a casting system 6, an upper tie bar 7, a middle column tube 8 and a reinforcing tie bar 9.
3) Moulding
According to the requirement of pressing a wax mould in a casting process, filling wax to press a single crystal seed crystal test rod wax piece, an initial section S and a chassis wax piece; adopting pouring channel wax to press a wax piece of a pouring system, an upper lacing wire, a reinforcing lacing wire and a middle column pipe wax piece; the pouring cup is pressed by medium-temperature wax, and the single crystal seed crystal test bar wax piece needs to be placed on a special shape correcting tool for shaping after being pressed, so that the single crystal seed crystal test bar wax piece is guaranteed not to deform, and the straightness in the axial lead direction is good.
As shown in fig. 5-6, the shape correction tool includes a base plate seat 10, through slots 11 are opened on both sides of the base plate seat 10, a plurality of communicated shape correcting grooves 12 are arranged between the through grooves 11 on the two sides of the top surface of the base plate seat 10, the shape correcting grooves 12 and the through grooves 11 are matched with each other to place single crystal seed crystal test rod wax pieces, two end parts of the adjacent single crystal seed crystal test rod wax pieces are arranged in a staggered manner, a reference surface F of the single crystal seed crystal test rod wax pieces is flush with the top surface of the base plate seat 10, the top surface of the bottom plate seat 10 is provided with a pressing plate 13, two ends of the pressing plate 13 are fixedly pressed by a push-pull clamp 14, the push-pull clamp 14 is fixedly connected with two ends of the bottom plate seat 10 by a support 15, the reference surface F of the single crystal seed crystal test stick wax piece is pressed through the pressing plate 13, so that the test stick body section of the single crystal seed crystal test stick wax piece is tightly attached to the shape correction groove 12, and the straightness of the axis line direction of the single crystal seed crystal test stick wax piece is ensured.
4) Wax pattern tree
And assembling and welding the single crystal seed crystal test bar wax piece, the starting section S, the chassis wax piece, the casting system wax piece, the upper tie bar, the reinforcing tie bar, the middle column pipe wax piece and the pouring cup according to the requirements of the model tree assembly.
5) Shell making
Coating a precision casting shell with the thickness of 5-19mm on the surface of the wax mould module, dewaxing at 130-180 ℃, roasting at 920-980 ℃, and preserving heat for 2-4 hours to ensure that the precision casting ceramic shell for the single crystal is obtained after residual wax is completely combusted.
6) Smelting and pouring
And (2) placing the ceramic shell into a heater of a single crystal directional solidification furnace, setting corresponding smelting process parameters, heating to a shell heat preservation temperature of 1490-minus 1510 ℃, preserving heat for 30min, remelting and pouring a mother alloy ingot into a mould shell after the temperature is reached, setting the pouring temperature at 1500-minus 1520 ℃, drawing after standing for 90 seconds after pouring, setting the crystal pulling rate at 3-5mm/min, and after crystal pulling is finished, cooling with the furnace for 5-7 min, breaking vacuum and taking out to prepare the required single crystal seed crystal test rod blank.
7) Post-treatment
According to the casting process requirement, sand removal, cutting and grain size corrosion are carried out, after a mould shell and floating sand are removed, an initial section and a dead head of a single crystal seed crystal test rod are cut off to obtain a test rod body, the test rod body is positioned, locked and fixed by using a clamping tool, a cutting device moves and cuts along the direction vertical to a reference surface F of the single crystal test rod, the single crystal test rod is cut in sections according to the length of a seed crystal section of 35mm to obtain five seed crystal sections, and the seed crystal sections are subjected to grain size corrosion.
8) Grain detection, Laue detection
The integrity of the cut single crystal seed crystal section subjected to the grain corrosion is visually checked, and the requirements for visually checking the integrity of the single crystal are as follows:
firstly, no visible crystal boundary exists within 15mm from the end surface of one side of the seed crystal;
no equiaxed crystal exists at least within 15mm from one end face of the seed crystal, and equiaxed crystal grains with the diameter less than 0.5mm are not counted;
thirdly, columnar crystals which are not visible in a visual way at least within 15mm from the end surface of one side of the seed crystal;
and fourthly, the inner surface of the seed crystal is at least 15mm from the end surface of one side of the seed crystal, and freckle defects are not allowed to appear.
The LaUE-HT X-ray diffractometer is used for carrying out Laue detection on the seed crystal section, whether the seed crystal with the primary dendritic crystal and the secondary dendritic crystal which are deviated from the axial direction is qualified or not is judged according to the Laue detection result, the qualified standard is that the primary dendritic crystal and the secondary dendritic crystal are deviated from the axial direction within the range of 0-5 degrees, the surface of the seed crystal section with the qualified Laue detection crystal orientation is polished and cleaned, the surface of the seed crystal is free from redundant adhesive substances, oil stains, oxide scales and the like, the seed crystal is placed in a wooden box and stored in a dry storage chamber and used for casting nickel-based single crystal blades, and unqualified seed crystal is scrapped.
The shape and the size of the single crystal seed test rod are designed, the primary dendritic crystal and the secondary dendritic crystal orientation of the single crystal seed are accurately controlled, the crystal orientation is accurate, the integrity of crystal grains is good, the crystal grain defects such as large-angle crystal boundary, isometric crystal, columnar crystal, freckle and the like do not exist, the seed crystal prepared by adopting the casting process can be used as long as the crystal grains and the laue detection are qualified after being cut, the secondary cutting is not needed, the operation steps are simple, the production efficiency is improved, and the method is suitable for the engineering application of producing single crystal blades by using the seed crystal method.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controllable three-dimensional orientation is characterized by comprising the following steps of: the method comprises the following steps:
1) shape and size design of single crystal seed crystal test rod
Manufacturing a single crystal seed crystal test bar, wherein the test bar comprises an initial section, a test bar body and a riser, the axial lead direction of the test bar is a primary dendritic crystal orientation direction, a reference plane F is arranged on the test bar, and a direction B which is parallel to the placing direction of the reference plane F and is vertical to the axial line first direction of the test bar is defined, and the direction B is a secondary dendritic crystal orientation direction;
2) modular design
Manufacturing a pouring module which consists of nine parts, namely a single crystal seed test rod, a spiral crystal selector, a pouring cup, an initial section S, a chassis, a pouring system, an upper tie bar, a middle column tube and a reinforcing tie bar;
3) moulding
According to the requirement of pressing a wax mould in a casting process, filling wax to press a single crystal seed crystal test rod wax piece, an initial section S and a chassis wax piece; adopting pouring channel wax to press a wax piece of the pouring system, an upper lacing wire, a reinforcing lacing wire and a middle column pipe wax piece; pressing a sprue cup by using medium-temperature wax, and shaping the single crystal seed crystal test bar wax piece after pressing on a special shaping tool, so that the single crystal seed crystal test bar wax piece is ensured not to deform and the straightness in the axial lead direction is good;
4) wax pattern tree
According to the requirements of model tree assembly, carrying out assembly welding on a single crystal seed crystal test bar wax piece, an initial section S, a chassis wax piece, a pouring system wax piece, an upper tie bar, a reinforcing tie bar, a center pillar pipe wax piece and a pouring cup;
5) shell making
Coating a precision casting shell with the thickness of 5-19mm on the surface of the wax mould module, dewaxing at 130-180 ℃, roasting at 920-980 ℃, and preserving heat for 2-4 hours to ensure that the residual wax is completely combusted to obtain the precision casting ceramic shell for the single crystal;
6) smelting and pouring
Placing the prepared ceramic shell into a heater of a single crystal directional solidification furnace, setting corresponding smelting process parameters, heating to the shell heat preservation temperature of 1490-1510 ℃, preserving heat for 30min, remelting and pouring a mother alloy material ingot into a mould shell after the temperature is reached, setting the pouring temperature at 1500-1520 ℃, standing for 90 seconds after pouring, drawing, setting the crystal pulling rate at 3-5mm/min, cooling along with the furnace for 5-7 minutes after crystal pulling is finished, breaking vacuum and taking out to prepare the required single crystal seed crystal test rod blank;
7) post-treatment
According to the casting process requirement, carrying out sand removal, cutting and grain size corrosion, removing a mould shell and floating sand, cutting off an initial section and a dead head of a single crystal seed crystal test bar to obtain a test bar body, positioning, locking and fixing the test bar body by using a clamping tool, moving and cutting a cutting device along a direction vertical to a reference surface F of the single crystal test bar, cutting the single crystal test bar in sections according to the length of the seed crystal sections to obtain a plurality of seed crystal sections, and carrying out grain size corrosion on the seed crystal sections;
8) grain detection, Laue detection
And (3) visually checking the integrity of the cut single crystal seed crystal section subjected to grain corrosion, performing Laue-HT X-ray diffractometer on the seed crystal section, and judging whether the seed crystal with the primary dendrite and the secondary dendrite which deviate from the axial direction is qualified or not according to the Laue-HT X-ray diffractometer.
2. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: the shape correcting tool in the step 3) comprises a base plate seat, through grooves are formed in two sides of the base plate seat, a plurality of communicated correcting grooves are formed between the through grooves in the two sides of the base plate seat, the correcting grooves and the through grooves are matched to place single crystal seed crystal test rod wax pieces, two adjacent ends of the single crystal seed crystal test rod wax pieces are arranged in a staggered mode, the reference surface F of the single crystal seed crystal test rod wax pieces is flush with the top surface of the base plate seat, a pressing plate is arranged on the top surface of the base plate seat, two ends of the pressing plate are fixed through opening and closing hinges in a compression joint mode, and the opening and closing hinges are fixedly connected with the two ends of the base plate seat through supports.
3. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: in the step 1), a pentagonal groove matched and spliced with the spiral crystal selector is formed in the end face of the initial section, and the direction B is the connecting line direction of a fixed point C of the pentagonal groove and a midpoint D of one side corresponding to the pentagonal fixed point C.
4. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: the length of the seed crystal segment in the step 7) is 35mm, and each single crystal test bar is cut into five seed crystal segments.
5. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: the requirements for visual inspection of the integrity of the single crystal in step 8) are:
firstly, no visible crystal boundary exists within 15mm from the end surface of one side of the seed crystal;
no equiaxed crystal exists at least within 15mm from one end face of the seed crystal, and equiaxed crystal grains with the diameter less than 0.5mm are not counted;
thirdly, columnar crystals which are not visible in a visual way at least within 15mm from the end surface of one side of the seed crystal;
and fourthly, the inner surface of the seed crystal is at least 15mm from the end surface of one side of the seed crystal, and freckle defects are not allowed to appear.
6. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: and 8) polishing and cleaning the surface of the seed crystal section with qualified crystal orientation through Laue detection in the step 8), ensuring that the surface of the seed crystal has no redundant adhesive substances, oil stains, oxide skins and the like, placing the seed crystal section in a wooden box, storing the seed crystal section in a dry storage room for casting the nickel-based single crystal blade, and scrapping the unqualified seed crystal.
7. The preparation process of the seed crystal for casting the nickel-based single crystal blade with the precisely controlled three-dimensional orientation as claimed in claim 1, wherein the preparation process comprises the following steps: the qualified standard in the step 8) is that the orientation deviation of the primary dendrite and the secondary dendrite is within the range of 0-5 degrees.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117444140A (en) * | 2023-12-22 | 2024-01-26 | 中国航发北京航空材料研究院 | Secondary orientation controllable polycrystalline test plate wax mould and preparation method of wax mould |
| FR3139197A1 (en) * | 2022-08-25 | 2024-03-01 | Safran | Process for controlling the crystalline state of a monocrystalline foundry part |
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