CN114653965B - 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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- CN114653965B CN114653965B CN202011536297.5A CN202011536297A CN114653965B CN 114653965 B CN114653965 B CN 114653965B CN 202011536297 A CN202011536297 A CN 202011536297A CN 114653965 B CN114653965 B CN 114653965B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 238000002844 melting Methods 0.000 title claims abstract description 17
- 230000008018 melting Effects 0.000 title claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 75
- 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
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000011049 filling Methods 0.000 claims abstract description 10
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 238000005488 sandblasting Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 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
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 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
- 238000007781 pre-processing Methods 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 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
- 238000013316 zoning Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract 2
- 238000003466 welding Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000004372 laser cladding Methods 0.000 description 4
- 238000005495 investment casting Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000009864 tensile test 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
- 238000005242 forging Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005493 welding type Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
Abstract
The invention provides a selective laser melting manufacturing method of a turbine hollow stationary blade, which comprises the following steps: model pretreatment: the method comprises the steps of (1) conducting layout on a hollow static blade model on a printing substrate reference surface, so that the root end surface of the hollow static blade model is parallel to the printing substrate reference surface; preparation before printing: drying the 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 out the hollow stationary blade by adopting a preset laser scanning mode and preset printing parameters; post-treatment of printed matter: and carrying out stress relief annealing treatment on the hollow stationary blade to separate the hollow stationary blade from the printing substrate, and carrying out sand blasting treatment and polishing treatment on the surface of the hollow stationary blade. The invention can produce hollow stationary blades with higher quality in batches, so that the whole production process of the hollow stationary blades is simpler.
Description
Technical Field
The invention relates to the field of production of hollow turbine stationary blades, in particular to a selective laser melting manufacturing method of hollow turbine stationary blades.
Background
Turbine hollow vanes are typically manufactured by welding or precision casting. The manufacturing of the welded hollow stationary blade comprises the working procedures of stamping the inner blade and the back plate, processing a welding groove, welding blade parts, correcting the blade and the like. Some hollow stationary blades comprise four parts including a back arc, an inner arc, a steam inlet edge and a steam outlet edge, the punching preparation of blade parts and the welding of blades involve the manufacture 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 welding process and deformation control are high.
The cast stator blade adopts investment precision casting, and is cleaned, machined, polished and polished to obtain the product blade. The investment casting process is complex, the manufacturing cost is high, and the complex inner cavity structure is difficult to manufacture.
Chinese patent (application number 201810244004.2) discloses a manufacturing method for manufacturing hollow blades by adopting a laser cladding 3D printing technology. Notably, are: according to the existing manufacturing method, hollow blades are welded and printed layer by layer on a metal substrate in a mode of combining pneumatic powder feeding with laser welding until printing of the whole blade is completed. Because of the limitation of the powder feeding type laser cladding process, the laser beam spot width of the patent is 2mm, so that the printing precision is lower, 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 drawbacks of the prior art, the present invention is to provide a method for manufacturing a hollow vane of a turbine by selective laser melting, which can mass-produce hollow vanes of higher quality, so that the overall production process of the hollow vane is simpler.
In order to solve the technical problems, the invention provides a selective laser melting manufacturing method of a turbine hollow stationary blade, 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 areas, arranging a model to be printed in each single-quadrant area, wherein the model to be printed comprises a hollow stationary blade model, enabling the root end surface 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: mounting a printing substrate and a powder spreading cutter 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 out the 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 the residual metal powder in the hollow stationary blade after printing is finished;
post-treatment of printed matter: and carrying out stress relief annealing treatment on the hollow stationary blade to separate the hollow stationary blade from the printing substrate, and carrying out sand blasting treatment and polishing treatment on the surface of the hollow stationary blade.
Preferably, in the step of model preprocessing, the model to be printed further includes a test bar model; the selective laser melting manufacturing method further comprises the step of detecting a printed piece: and (3) carrying out mechanical property test and microstructure observation on the test bars printed and molded in the same batch with the hollow stationary blade, and if the test results and the observation results of the test bars reach preset indexes, indicating that the quality of the hollow stationary blade is qualified.
Preferably, the test stick model includes a first test stick model that lies on its back and a second test stick model that stands upright.
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 percent, 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 percent, O: less than or equal to 0.06 percent.
Preferably, the preset laser scanning mode includes: the laser scanning is performed in a stripe zone mode, zone-by-zone jumping sintering and in a direction opposite to the flow direction of the inert shielding 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 overlap of the strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the contour laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s.
Preferably, the stress relief anneal comprises: under the condition of high vacuum, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃ and then kept for 4.5 hours, and the hollow stationary blade and the test bar are cooled along with the furnace.
Preferably, the blasting treatment includes: zirconia particles with the particle size of 0.1-0.3 mm are selected for carrying out comprehensive 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 the turbine hollow stationary blade by selective laser melting has the following beneficial effects: according to the invention, the pattern to be printed is arranged on the reference surface of the printing substrate, the pattern to be printed comprises the hollow stationary blade pattern, and the root end surface of the hollow stationary blade pattern is parallel to the reference surface of the printing substrate, so that an auxiliary supporting piece for supporting the hollow stationary blade can be omitted, and the printing quality of the surface of the hollow stationary blade can be ensured. The method comprises the steps of printing out the 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, 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 stationary blade, the hollow stationary blade is integrally formed, processes such as stamping and welding are not needed, batch printing can be achieved, and the production requirement of a single piece can be met. Compared with the existing cast hollow stationary blade, the hollow stationary blade has the advantages that the die does not need to be opened, and the hollow stationary blade with a complex inner cavity structure can be manufactured. Compared with the existing powder feeding type laser cladding formed hollow stationary blade, the invention has higher production precision, the rough blank is close to the finish machining state, a plurality of hollow stationary blades can be printed at a time, and the performance of the hollow stationary blade reaches the forging level. Therefore, the selective laser melting manufacturing method of the turbine hollow stationary blade can be used for mass production of the hollow stationary blade with higher quality, so that the whole production process of the hollow stationary blade is simpler.
Drawings
FIG. 1 is a schematic diagram of a layout on a reference surface of a printing substrate according to the present invention;
FIG. 2 shows a schematic view of a hollow vane model and a test stick model;
FIG. 3 shows a morphology of a metallographic structure of a test bar.
Description of element reference numerals
1. Printing substrate reference plane
11. Single quadrant region
2. Hollow stationary blade model
3. Test bar model
31. First test bar model
32. Second test bar model
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the invention, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1 and 2, the present invention provides a selective laser melting manufacturing method of a turbine hollow vane, comprising the steps of:
model pretreatment: in a 3D printing software system, dividing a printing substrate reference plane 1 into a plurality of single quadrant areas 11 uniformly, arranging a model to be printed in each single quadrant area 11, wherein the model to be printed comprises a hollow stationary blade model 2, enabling the root end surface of the hollow stationary blade model 2 to be parallel to the printing substrate reference plane 1, and then leading the model to be printed into a printing device (such as a SLM device);
preparation before printing: mounting a printing substrate and a powder spreading cutter 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 out the 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 the residual metal powder in the hollow stationary blade after printing is finished;
post-treatment of printed matter: the hollow vane is subjected to a stress relief annealing treatment to separate the hollow vane from the print substrate (for example, a portion of the wire cut hollow vane abutting against the print substrate), and the surface of the hollow vane is subjected to a blast treatment and a polishing treatment.
In the invention, the pattern to be printed is arranged on the reference surface 1 of the printing substrate, the pattern to be printed comprises the hollow stationary blade pattern 2, and the root end surface of the hollow stationary blade pattern 2 is parallel to the reference surface 1 of the printing substrate, so that an auxiliary supporting piece for supporting the hollow stationary blade can be omitted, and the printing quality of the surface of the hollow stationary blade can be ensured. The method comprises the steps of printing out the 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, 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 stationary blade, the hollow stationary blade is integrally formed, processes such as stamping and welding are not needed, batch printing can be achieved, and the production requirement of a single piece can be met. Compared with the existing cast hollow stationary blade, the hollow stationary blade has the advantages that the die does not need to be opened, and the hollow stationary blade with a complex inner cavity structure can be manufactured. Compared with the existing powder feeding type laser cladding formed hollow stationary blade, the invention has higher production precision, the rough blank is close to the finish machining state, a plurality of hollow stationary blades can be printed at a time, and the performance of the hollow stationary blade reaches the forging level. Therefore, the selective laser melting manufacturing method of the turbine hollow stationary blade can be used for mass production of the hollow stationary blade with higher quality, so that the whole production process of the hollow stationary blade is simpler.
Further, in the step of the model preprocessing, the model to be printed further comprises a test bar model 3; the selective laser melting manufacturing method further comprises the step of detecting the printed piece: and (3) carrying out mechanical property test and microstructure observation on the test bars printed and molded in the same batch with the hollow stationary blade, and if the test results and the observation results of the test bars reach preset indexes, indicating that the quality of the hollow stationary blade is qualified. In such a way, a performance basis is provided for the printing quality of the hollow stationary blade printed in the same batch, and whether the quality of the hollow stationary blade is qualified is indirectly judged, so that the selective laser melting manufacturing method is more easily applied to the mass production of the hollow stationary blade.
The mechanical property test comprises the following steps: and performing longitudinal or transverse tensile test on the test bars printed and molded in the same batch with the hollow stationary blade. Specifically, the test bar model 3 includes a first horizontal test bar model 31 and a second vertical test bar model 32, and performs a transverse tensile test on the test bar corresponding to the first test bar model 31 and 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 table 1, the quality of the hollow stationary blade can be indirectly indicated to be qualified. In Table 1, R p0.2 A stress value representing 0.2% non-proportional elongation of the test bar; r is R m The tensile strength of the test bar; a represents the elongation of the test bar; z represents the area reduction rate of the test bar.
TABLE 1 results of mechanical Properties at room temperature
The microstructure observation includes: observing the transverse and longitudinal microstructures of the test bar subjected to stress-relief annealing treatment, and indirectly indicating that the hollow stationary blade is qualified if the test bar has no defects such as unfused and microcracks (see figure 3) and the density (the density can be measured by adopting a metallographic method or a density method) is not less than 99 percent.
In order to facilitate distinguishing the hollow vane model 2 from the test stick model 3, the model preprocessing further includes: each hollow stationary blade model 2 and each test bar model 3 are numbered and labeled, and all models are saved.
The above-mentioned layout includes: the printing substrate reference plane 1 is uniformly divided into a plurality of single-quadrant areas 11, and the pattern arrangement modes of the hollow stationary blade model 2 and the test bar model 3 which are positioned in all the single-quadrant areas 11 are the same. For example, the printing substrate reference plane 1 is divided into four single-quadrant regions 11, and seven hollow vanes 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 percent, 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 percent, O: less than or equal to 0.06 percent.
In order to improve the quality of the hollow stationary blade, the preset laser scanning method includes: the laser scanning is performed in a stripe zone mode, zone-by-zone jumping sintering and in a direction opposite to the flow direction of the inert shielding gas.
In order to improve the quality of the hollow vane, 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 overlap of the strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the contour laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s.
In order to improve the quality of the hollow vane, the stress relief annealing includes: under the condition of high vacuum, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃ and then 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 hollow vane surface, the blasting includes: zirconia particles with the particle size of 0.1-0.3 mm are selected for carrying out comprehensive 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 hollow stationary blade can be produced in batches, so that the whole production process of the hollow stationary blade is simpler. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (3)
1. A selective laser melting manufacturing method of a turbine hollow stationary blade is characterized by comprising the following steps of:
model pretreatment: in a 3D printing software system, dividing a printing substrate reference surface (1) into a plurality of single-quadrant areas (11), arranging a model to be printed in each single-quadrant area (11), wherein the model to be printed comprises a hollow stationary blade model (2), enabling the root end surface 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;
in the step of model preprocessing, the model to be printed further comprises a test bar model (3); the selective laser melting manufacturing method further comprises the step of detecting a printed piece: mechanical property test and microstructure observation are carried out on the test bars printed and molded in the same batch with the hollow stationary blade, and if the test results and the observation results of the test bars reach preset indexes, the quality of the hollow stationary blade is qualified;
preparation before printing: mounting a printing substrate and a powder spreading cutter 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;
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 percent, 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 percent, O: less than or equal to 0.06 percent; the drying comprises the following steps: placing the metal powder in an oven, the temperature of the metal powder being maintained for at least 8 hours after reaching 120 ℃;
printing and forming: printing out the 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 the residual metal powder in the hollow stationary blade after printing is finished;
the preset laser scanning mode comprises the following steps: adopting a strip zoning mode, zone-by-zone jumping sintering and carrying out laser scanning in a direction opposite to the flow direction of inert shielding gas; 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 overlap joint amount of the strip area is 0.06-0.12 mm, the width of the strip area is 25-30 mm, the contour laser power is 280-300W, and the laser scanning speed is 700-1000 mm/s;
post-treatment of printed matter: carrying out stress relief annealing treatment on the hollow stationary blade to separate the hollow stationary blade from the printing substrate, and carrying out sand blasting treatment and polishing treatment on the surface of the hollow stationary blade;
the stress relief anneal includes: under the condition of high vacuum, the temperature of the hollow stationary blade and the test bar is raised to 390-410 ℃ and then kept for 4.5 hours, and the hollow stationary blade and the test bar are cooled along with the furnace.
2. The method of selective laser melting fabrication of a turbine hollow vane of claim 1, 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.
3. The method of selective laser melting fabrication of a turbine hollow vane of claim 1, wherein: the blasting treatment includes: zirconia particles with the particle size of 0.1-0.3 mm are selected for carrying out comprehensive 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.
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