CN114653965A - Selective laser melting manufacturing method of turbine hollow stationary blade - Google Patents
Selective laser melting manufacturing method of turbine hollow stationary blade Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 230000008018 melting Effects 0.000 title claims abstract description 23
- 238000002844 melting Methods 0.000 title claims abstract description 23
- 238000007639 printing Methods 0.000 claims abstract description 72
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 238000005488 sandblasting Methods 0.000 claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000012805 post-processing Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 23
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 3
- 238000005493 welding type Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a selective laser melting manufacturing method of a hollow turbine stator blade, which comprises the following steps: model pretreatment: performing stock layout on the hollow static blade model on the reference surface of the printing substrate, so that the end surface of the root of the hollow static blade model is parallel to the reference surface of the printing substrate; preparation before printing: drying metal powder to be printed, adding the metal powder into printing equipment, and then filling inert protective gas into the printing equipment; printing and forming: printing the hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters; and (3) post-processing of a printed product: the hollow stationary blade is subjected to stress relief annealing treatment to separate the hollow stationary blade from the print substrate, and the surface of the hollow stationary blade is subjected to sand blasting treatment and polishing treatment. The invention can produce the hollow stator blade with higher quality in batch, so that the whole production process of the hollow stator blade is simpler.
Description
Technical Field
The invention relates to the field of turbine hollow stationary blade production, in particular to a selective laser melting manufacturing method of a turbine hollow stationary blade.
Background
Hollow turbine vanes are typically welded or precision cast in a manufacturing process. The manufacturing method of the welding type hollow stationary blade comprises the working procedures of punching of the inner and back plates of the blade, welding groove processing, welding of blade parts, blade straightening and the like. Some hollow stationary blades further comprise four parts, namely a back arc part, an inner arc part, a steam inlet edge part and a steam outlet edge part, the stamping preparation of blade parts and the welding of the blades all relate to the manufacturing of special dies, the manufacturing cost is high, the hollow stationary blades are not suitable for the production of single blades, and the requirements on the welding process and the deformation control are high.
The casting stator blade is precisely cast by adopting an investment mold, and is cleaned, machined, ground and polished to form a product blade. The precision investment casting process is complex, the manufacturing cost is high, and the complex inner cavity structure is difficult to manufacture.
The Chinese patent application No. 201810244004.2 discloses a method for manufacturing a hollow blade by adopting a laser deposition 3D printing technology. It is worth noting that: according to the existing manufacturing method, the hollow blade is deposited and printed on the metal substrate layer by layer in a mode of matching pneumatic powder feeding with laser deposition until the printing of the whole blade is completed. Due to the limitation of the powder feeding type laser deposition process, the width of a laser beam spot is 2mm, so that the printing precision is low, the manufacturing requirement of a complex precise structure cannot be met, and the printing surface of a product is rough.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a method for manufacturing a hollow turbine vane by selective laser melting, which is capable of mass-producing a hollow turbine vane with higher quality, and thus simplifying the overall production process of the hollow turbine vane.
In order to solve the technical problem, the invention provides a method for manufacturing a hollow turbine stator blade by selective laser melting, which comprises the following steps:
model pretreatment: in a 3D printing software system, dividing a printing substrate reference surface into a plurality of single-quadrant regions, performing layout on a model to be printed in each single-quadrant region, wherein the model to be printed comprises a hollow stationary blade model, enabling the end surface of the root of the hollow stationary blade model to be parallel to the printing substrate reference surface, and then guiding the model to be printed into printing equipment;
preparation before printing: installing the printing substrate and the powder spreading knife to printing equipment, drying metal powder to be printed, adding the metal powder to the printing equipment, and then filling inert protective gas into the printing equipment;
printing and forming: printing a hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters, wherein the height of the hollow stationary blade is more than 300mm, and cleaning metal powder remained in the hollow stationary blade after printing is finished;
and (3) post-processing of a printed product: the hollow stationary blade is subjected to stress relief annealing treatment to separate the hollow stationary blade from the print substrate, and the surface of the hollow stationary blade is subjected to sand blasting treatment and polishing treatment.
Preferably, in the step of model preprocessing, the model to be printed further comprises a test stick model; the selective laser melting manufacturing method further includes the step of print detection: and (3) carrying out mechanical property test and microstructure observation on the test bars printed and formed in the same batch with the hollow stationary blades, and if the test results and the observation results of the test bars reach preset indexes, indicating that the quality of the hollow stationary blades is qualified.
Preferably, the test stick model comprises a first horizontal test stick model and a second vertical test stick model.
Preferably, the metal powder is Fe-based austenitic stainless steel powder, and the Fe-based austenitic stainless steel powder comprises the following components in percentage by mass: cr: 18.00-20.00%, C: less than or equal to 0.03%, Si: less than or equal to 0.75 percent, Ni: 8.00-12.00%, Mn: less than or equal to 2.00 percent, S: less than or equal to 0.030%, P: less than or equal to 0.045%, O: less than or equal to 0.06 percent.
Preferably, the preset laser scanning mode includes: and performing zone-by-zone jumping sintering in a strip zone-by-zone mode, and performing laser scanning in a direction opposite to the flowing direction of the inert protective gas.
Preferably, the preset printing parameters include: the thickness of the printing layer is 0.04-0.06 mm, the solid filling laser power is 280-320W, the filling interval is 0.08-0.13 mm, the overlapping amount of a strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the profile laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s.
Preferably, the stress relief annealing comprises: under the condition of high vacuum degree, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃, then the hollow stationary blade and the test bar are kept for 4.5 hours, and the hollow stationary blade and the test bar are cooled along with the furnace.
Preferably, the blasting comprises: and selecting zirconia particles with the particle size of 0.1-0.3 mm to carry out overall sand blasting treatment on the outer surface of the hollow stationary blade until the roughness of the outer surface of the hollow stationary blade reaches Ra3.2.
Preferably, the drying includes: the metal powder is placed in an oven and the temperature of the metal powder is maintained for at least 8 hours after reaching 120 ℃.
As described above, the method for manufacturing a hollow turbine stator blade by selective laser melting according to the present invention has the following advantageous effects: in the invention, the model to be printed is arranged on the reference surface of the printing substrate, the model to be printed comprises the hollow stationary blade model, and the end surface of the root of the hollow stationary blade model is parallel to the reference surface of the printing substrate, so that an auxiliary support for supporting the hollow stationary blade can be omitted, and the printing quality of the surface of the hollow stationary blade is ensured. The method comprises the steps of firstly printing a hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters, then carrying out stress relief annealing treatment on the hollow stationary blade, finally separating the hollow stationary blade from a printing substrate, and carrying out sand blasting treatment and polishing treatment on the surface of the hollow stationary blade. In addition, compared with the existing welding type hollow stator blade, the hollow stator blade is integrally formed, processes such as stamping, welding and the like are not needed, batch printing can be achieved, and the requirement of single-piece production can be met. Compared with the existing cast hollow stationary blade, the invention does not need to open the die and can manufacture the hollow stationary blade with a complex inner cavity structure. Compared with the existing powder feeding type laser deposition formed hollow stationary blade, the invention has higher production precision, the roughness of the blank is close to the finish machining state, a plurality of hollow stationary blades can be printed at one time, and the performance of the hollow stationary blade reaches the level of a forge piece. Therefore, the selective laser melting manufacturing method of the hollow turbine stator blade can be used for producing the hollow stator blade with higher quality in batch, so that the whole production process of the hollow stator blade is simpler.
Drawings
FIG. 1 is a schematic illustration of a layout on a reference surface of a printing substrate according to the present invention;
FIG. 2 is a schematic view of a hollow stationary blade model and a test bar model;
FIG. 3 is a topographical view of the metallographic structure of the test bar.
Description of the element reference numerals
1 printing substrate reference plane
11 single quadrant area
2 hollow stationary blade model
3 test stick model
31 first test bar model
32 second test stick model
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1 and 2, the present invention provides a method for manufacturing a hollow turbine vane by selective laser melting, comprising the steps of:
model pretreatment: in a 3D printing software system, dividing a printing substrate reference surface 1 into a plurality of single-quadrant regions 11, performing layout on a model to be printed in each single-quadrant region 11, wherein the model to be printed comprises a hollow stationary blade model 2, enabling the end face of the root of the hollow stationary blade model 2 to be parallel to the printing substrate reference surface 1, and then guiding the model to be printed into printing equipment (such as SLM equipment);
preparation before printing: mounting the printing substrate and the powder spreading knife to a printing device, drying metal powder to be printed and adding the metal powder to the printing device, and then filling inert protective gas (such as argon) into the printing device;
printing and forming: printing a hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters, wherein the height of the hollow stationary blade is more than 300mm, and cleaning metal powder remained in the hollow stationary blade after printing is finished;
and (3) post-processing of a printed product: the hollow stationary blade is subjected to stress relief annealing treatment to separate the hollow stationary blade from a print substrate (for example, a portion where the wire-cut hollow stationary blade abuts against the print substrate), and the surface of the hollow stationary blade is subjected to sand blasting treatment and polishing treatment.
In the invention, a model to be printed is arranged on a reference surface 1 of a printing substrate, the model to be printed comprises a hollow stationary blade model 2, and the end surface of the root of the hollow stationary blade model 2 is parallel to the reference surface 1 of the printing substrate, so that an auxiliary support for supporting the hollow stationary blade can be omitted, and the printing quality of the surface of the hollow stationary blade is ensured. The method comprises the steps of firstly printing a hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters, then carrying out stress relief annealing treatment on the hollow stationary blade, finally separating the hollow stationary blade from a printing substrate, and carrying out sand blasting treatment and polishing treatment on the surface of the hollow stationary blade. In addition, compared with the existing welding type hollow stator blade, the hollow stator blade is integrally formed, processes such as stamping, welding and the like are not needed, batch printing can be achieved, and the requirement of single-piece production can be met. Compared with the existing cast hollow stationary blade, the invention does not need to open the die and can manufacture the hollow stationary blade with a complex inner cavity structure. Compared with the existing powder feeding type laser deposition formed hollow stationary blade, the invention has higher production precision, the roughness of the blank is close to the finish machining state, a plurality of hollow stationary blades can be printed at one time, and the performance of the hollow stationary blade reaches the level of a forge piece. Therefore, the selective laser melting manufacturing method of the hollow turbine stator blade can be used for producing the hollow stator blade with higher quality in batch, so that the whole production process of the hollow stator blade is simpler.
Further, in the step of model preprocessing, the model to be printed further comprises a test stick model 3; the selective laser melting manufacturing method further comprises the following steps of detecting the printed product: and (3) carrying out mechanical property test and microstructure observation on the test bars printed and formed in the same batch with the hollow stationary blades, and if the test results and the observation results of the test bars reach preset indexes, indicating that the quality of the hollow stationary blades is qualified. By the operation, a performance basis is provided for the printing quality of the hollow stationary blades printed in the same batch, and whether the quality of the hollow stationary blades is qualified or not is indirectly judged, so that the selective laser melting manufacturing method is more easily applied to batch production of the hollow stationary blades.
The mechanical property test comprises the following steps: and carrying out longitudinal or transverse tension test on the test bars printed and formed in the same batch with the hollow stationary blades. Specifically, the test stick model 3 includes a first test stick model 31 lying on the back andthe second vertical test bar model 32 performs a transverse tensile test on the test bar corresponding to the first test bar model 31, and performs a longitudinal tensile test on the test bar corresponding to the second test bar model 32. If the test bar meets the preset index shown in the table 1, the quality of the hollow stationary blade can be indirectly proved to be qualified. In Table 1, Rp0.2A stress value representing 0.2% non-proportional elongation of the test bar; rmThe tensile strength of the test bar is shown; a represents the elongation of the test bar; z represents the reduction of area of the test bar.
TABLE 1 Room temperature mechanical Properties results
The above observation of the microstructure includes: the transverse and longitudinal microstructures of the test bar subjected to stress relief annealing treatment are observed, and if the test bar has no defects such as unfused and microcrack (see fig. 3) and the compactness (which can be measured by a metallographic method or a density method) is not less than 99 percent, the qualification of the hollow stationary blade can be indirectly demonstrated.
In order to distinguish the hollow stationary blade model 2 from the test bar model 3, the model preprocessing further includes: and numbering and marking each hollow static blade model 2 and each test rod model 3, and storing all the models.
The stock layout comprises: the reference surface 1 of the printing substrate is equally divided into a plurality of single quadrant areas 11, and the hollow stationary blade model 2 and the test bar model 3 positioned in all the single quadrant areas 11 have the same layout mode. For example, the printing substrate reference surface 1 is divided into four single quadrant regions 11, and seven hollow stationary blades and three test bars are arranged in each single quadrant region 11.
In order to improve the quality of the hollow stationary blade, the metal powder is Fe-based austenitic stainless steel powder, and the Fe-based austenitic stainless steel powder comprises the following components in percentage by mass: cr: 18.00-20.00%, C: less than or equal to 0.03%, Si: less than or equal to 0.75 percent, Ni: 8.00-12.00%, Mn: less than or equal to 2.00 percent, S: less than or equal to 0.030 percent, P: less than or equal to 0.045%, O: less than or equal to 0.06 percent.
In order to improve the quality of the hollow stationary blade, the preset laser scanning mode includes: and performing zone-by-zone jumping sintering in a strip zone-by-zone mode, and performing laser scanning in a direction opposite to the flowing direction of the inert protective gas.
In order to improve the quality of the hollow stationary blade, the preset printing parameters include: the thickness of the printing layer is 0.04-0.06 mm, the solid filling laser power is 280-320W, the filling interval is 0.08-0.13 mm, the overlapping amount of a strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the profile laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s.
In order to improve the quality of the hollow stationary blade, the stress relief annealing includes: under the condition of high vacuum degree, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃, then the hollow stationary blade and the test bar are kept for 4.5 hours, and the hollow stationary blade and the test bar are cooled along with the furnace.
In order to improve the quality of the surface of the hollow stationary blade, the sand blasting includes: and selecting zirconia particles with the particle size of 0.1-0.3 mm to carry out overall sand blasting treatment on the outer surface of the hollow stationary blade until the roughness of the outer surface of the hollow stationary blade reaches Ra3.2.
In order to sufficiently dry the metal powder, the drying includes: the metal powder is placed in an oven and the temperature of the metal powder is maintained for at least 8 hours after reaching 120 ℃.
In conclusion, the invention can produce the hollow stator blades with higher quality in batch, so that the whole production process of the hollow stator blades is simpler. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A method for selective laser melting fabrication of a hollow turbine vane comprising the steps of:
model pretreatment: in a 3D printing software system, a printing substrate reference surface (1) is divided into a plurality of single-quadrant regions (11), a model to be printed is arranged in each single-quadrant region (11), the model to be printed comprises a hollow stationary blade model (2), the end face of the root of the hollow stationary blade model (2) is made to be parallel to the printing substrate reference surface (1), and then the model to be printed is led into printing equipment;
preparation before printing: installing the printing substrate and the powder spreading knife to printing equipment, drying metal powder to be printed, adding the metal powder to the printing equipment, and then filling inert protective gas into the printing equipment;
printing and forming: printing a hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters, wherein the height of the hollow stationary blade is more than 300mm, and cleaning metal powder remained in the hollow stationary blade after printing is finished;
and (3) post-processing of a printed product: the hollow stationary blade is subjected to stress relief annealing treatment to separate the hollow stationary blade from the print substrate, and the surface of the hollow stationary blade is subjected to sand blasting treatment and polishing treatment.
2. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: in the step of model pretreatment, the model to be printed further comprises a test stick model (3); the selective laser melting manufacturing method further includes the step of print detection: and (3) carrying out mechanical property test and microstructure observation on the test bars printed and formed in the same batch with the hollow stationary blades, and if the test results and the observation results of the test bars reach preset indexes, indicating that the quality of the hollow stationary blades is qualified.
3. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 2, wherein: the test stick model (3) comprises a first test stick model (31) which is horizontal and a second test stick model (32) which is vertical.
4. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: the metal powder is Fe-based austenitic stainless steel powder, and the Fe-based austenitic stainless steel powder comprises the following components in percentage by mass: cr: 18.00-20.00%, C: less than or equal to 0.03%, Si: less than or equal to 0.75 percent, Ni: 8.00-12.00%, Mn: less than or equal to 2.00 percent, S: less than or equal to 0.030 percent, P: less than or equal to 0.045%, O: less than or equal to 0.06 percent.
5. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: the preset laser scanning mode comprises the following steps: and performing zone-by-zone jumping sintering in a strip zone-by-zone mode, and performing laser scanning in a direction opposite to the flowing direction of the inert protective gas.
6. The method of selective laser melting fabrication of hollow turbine vanes according to claim 5, wherein: the preset printing parameters include: the thickness of the printing layer is 0.04-0.06 mm, the solid filling laser power is 280-320W, the filling interval is 0.08-0.13 mm, the overlapping amount of a strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the profile laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s.
7. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: the stress relief annealing comprises: under the condition of high vacuum degree, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃, then the hollow stationary blade and the test bar are kept for 4.5 hours, and the hollow stationary blade and the test bar are cooled along with the furnace.
8. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: the sand blasting treatment comprises: and selecting zirconia particles with the particle size of 0.1-0.3 mm to carry out overall sand blasting treatment on the outer surface of the hollow stationary blade until the roughness of the outer surface of the hollow stationary blade reaches Ra3.2.
9. The method of selective laser melting fabrication of a hollow turbine vane as claimed in claim 1, wherein: the drying includes: the metal powder is placed in an oven and the temperature of the metal powder is maintained for at least 8 hours after reaching 120 ℃.
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