CN109036594B - Forming method of integral reflecting layer of in-pile member - Google Patents
Forming method of integral reflecting layer of in-pile member Download PDFInfo
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- CN109036594B CN109036594B CN201810844575.XA CN201810844575A CN109036594B CN 109036594 B CN109036594 B CN 109036594B CN 201810844575 A CN201810844575 A CN 201810844575A CN 109036594 B CN109036594 B CN 109036594B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a forming method of an integral reflecting layer of an in-pile member, which comprises the following steps: 1) selecting raw materials for laser melting of the additively manufactured integral reflective layer; 2) compiling an additive manufacturing program according to the size of the integral reflecting layer; 3) performing surface treatment on the substrate for the additive; 4) melting and accumulating the additive raw materials on the substrate layer by using laser as a heat source through a powder feeding melting method so as to realize the molding of the integral reflecting layer; 5) carrying out solution heat treatment on the integral reflection layer; 6) stabilizing the integral reflecting layer; 7) performing liquid permeation inspection on the integral reflecting layer; 8) the integral reflective layer is subjected to ultrasonic inspection. The reinforcing rib plate integrally formed with the enclosing plate is arranged at the weak link of the enclosing plate, so that the rigidity of the reactor core reflecting layer structure is improved, the structural continuity of the integrally formed reactor core reflecting layer is good, the mechanical property is better, the manufacturing period is greatly shortened, and the manufacturing process is greatly simplified.
Description
Technical Field
The invention relates to the field of nuclear reactor structural design, in particular to a forming method of an integral reflecting layer of an in-reactor component.
Background
The reactor internals integral reflection layer structure is a key part of the reactor structure, generally comprises a plurality of coamings, a plurality of forming plates, thousands of bolts and positioning pins, is integrally formed through the connection of fasteners and is arranged inside a hanging basket barrel body of the reactor internals. The structure has complex composition, a plurality of parts and high design and manufacture precision, and basically reaches the limit of the existing manufacture capability. Meanwhile, the structure formed by thousands of parts is not beneficial to the safety of the long-term operation of the reactor under the conditions of flow-induced vibration, high irradiation and high temperature; the reactor core reflecting layer structure formed by integral machining or integral welding is adopted in third-generation advanced reactors such as AP1000 and the like, but the machining amount of the integral machining structure is overlarge, the reactor core reflecting layer structure formed by integral welding is formed by assembling and welding thin plate structural members, the welding deformation is too large, the precision is difficult to control, and the structural strength is general.
Disclosure of Invention
The invention aims to provide a forming method of an integral type reflecting layer of a reactor internals, which can manufacture the integral type reflecting layer of the reactor internals without bolts, connecting pin fasteners and welding.
The invention is realized by the following technical scheme:
a method for forming an integral reflective layer of an internals package, comprising the steps of:
1) selecting raw materials for laser melting of the additively manufactured integral reflective layer;
2) compiling an additive manufacturing program according to the size of the integral reflecting layer;
3) performing surface treatment on the substrate for the additive;
4) by taking laser as a heat source, melting and accumulating additive raw materials on a substrate layer by a powder feeding melting method to form an integrally formed coaming plate, an integrally formed annular plate and an integrally formed rib plate so as to realize the forming of an integral reflecting layer;
5) carrying out solution heat treatment on the integral reflection layer;
6) carrying out size stabilization treatment on the integral reflection layer;
7) performing liquid permeation inspection on the integral reflecting layer;
8) the integral reflective layer is subjected to ultrasonic inspection.
When the integral reflection layer is processed, based on a laser melting additive manufacturing technology, according to the standard of RCC-M pressurized water reactor nuclear island mechanical equipment design and construction rules, firstly selecting raw materials of the integral reflection layer, compiling an additive manufacturing program after determining the specific size of the integral reflection layer, then polishing and grinding the surface of a substrate for additive to provide stable support for the molding of the integral reflection layer, and then piling the whole raw materials on the substrate layer by using laser as a heat source through a powder feeding melting method to gradually form an integral molding coaming, an integral molding annular plate and an integral molding rib plate until the integral reflection layer is completely molded; and then carrying out solution heat treatment on the formed integral type reflecting layer, namely, carrying out heating treatment and subsequent water cooling treatment of a heat treatment furnace to reduce the probability of rusting and corrosion of the integral type reflecting layer, continuously carrying out machining on the integral type reflecting layer until the final size and surface roughness requirements required by a drawing are met, carrying out size stabilization treatment on the integral type reflecting layer after the machining is finished, further determining the final shape and performance of the integral type reflecting layer, and finally verifying whether the formed integral type reflecting layer meets the standard or not through liquid permeation inspection and ultrasonic inspection. Specifically, based on laser melting additive manufacturing technology, the integral reactor core reflecting layer is designed into an integral forming structure, a coaming and a forming annular plate are connected into a whole without adopting fasteners such as bolts or the like or strength welding mode, and based on the additive manufacturing technology, the integral reactor core reflecting layer is piled up layer by layer to be formed, an integral forming rib plate is arranged at a weak link at the periphery of the integral forming coaming, has the same height with the integral forming coaming and is formed together with the integral forming coaming and the integral forming annular plate, and the integral reactor core reflecting layer is obtained.
The conventional reactor core reflecting layer is formed by connecting a coaming and a forming ring plate into a whole by using bolts, a plurality of fasteners such as bolts, pins and the like are used in the design, and the fasteners have the risks of fatigue fracture and loosening under the long-term irradiation environment in a nuclear reactor; the other scheme is that the coaming and the forming annular plate are connected into a whole by welding, and a plurality of reinforcing rib plates are arranged between the coaming and the forming annular plate for preventing welding deformation and reinforcing integral rigidity; and through laser melting additive manufacturing technology in this application for the integrated into shape bounding wall, the integrated into shape crown plate and the integrated into shape gusset of integral reflection stratum generate simultaneously, make the processing of integral reflection stratum not need traditional forging production and welding, cancelled all full penetration weld joints, avoided the welding deformation of structure, improved the shaping quality, the structure continuity is good, adopted with reactor core reflection stratum wait high integrated into shape gusset, mechanical properties is better, the manufacturing cycle shortens substantially, manufacturing process is simplified greatly.
In the step 1), the raw material of the integral reflecting layer is Z2CN19-10 powder, the granularity of the Z2CN19-10 powder is 100 meshes-500 meshes, and the nitrogen content of the Z2CN19-10 powder is less than or equal to 0.12%. Furthermore, the materials of the integral reflection layer and the chromium coating layer meet the relevant standards in RCC-M pressurized water reactor nuclear island mechanical equipment design and construction rules, wherein Z2CN19-10 powder is selected as the raw material of the integral reflection layer, the powder granularity is 100-500 meshes, the nitrogen content of the powder is not more than 0.12% on the premise of not reducing the mechanical property, the powder granularity with the number has a good forming effect in melting, and the nitrogen content can meet the strength requirement after melting forming so as to ensure the good performance of the integral reflection layer and the chromium coating layer after forming.
In the step 4), the laser power in the powder feeding melting method is 100-4000W, the melting speed is 50-200 g/h, and the single-layer thickness is 0.1-1 mm until the size of additive manufacturing required by design is completed. Furthermore, raw materials are stacked on the substrate layer by layer through a powder feeding melting method, and in the integral type reflecting layer forming process, the laser power is set to be 100-3000W, so that the melting speed of the raw materials is 50-100 g/h, meanwhile, the thickness of single-layer stacking of the raw materials is kept in a range of 0.1-1 mm, and the performance of the finally formed integral type reflecting layer and the chromium coating layer is optimal.
In the step 5), the solution heat treatment process comprises the following steps: and (2) placing the integral type reflecting layer in a heat treatment furnace, heating to 1000-1100 ℃ for 1-4 hours to completely dissolve carbide in the integral type reflecting layer, dissolving carbon element in austenite, taking out the integral type reflecting layer from the heat treatment furnace, and carrying out water cooling treatment on the integral type reflecting layer until the integral type reflecting layer is cooled to enable carbon to reach a supersaturated state. Further, during solution heat treatment, the integral reflecting layer is placed in a heat treatment furnace and heated to 1000-1100 ℃ for 1-4 hours to completely or basically dissolve carbide, carbon element is dissolved in austenite, then the integral reflecting layer is taken out of the heat treatment furnace, and a water cooling mode is used to rapidly cool the integral reflecting layer to room temperature so that carbon reaches a supersaturated state. The heating temperature is 1000-1100 ℃, the purpose is to completely or basically dissolve the carbide, the risk that the carbide causes the stainless steel material of the integral reflecting layer to rust and corrode is avoided, the heat treatment time is 1-4 hours, the carbide can be completely or basically dissolved, and the phenomenon that the stainless steel material is excessively heat treated to cause coarse stainless steel grains and reduced mechanical property can be avoided; the water cooling is adopted to rapidly cool the stainless steel material, and the intercrystalline corrosion temperature interval is avoided.
In the step 5), the times of the solution heat treatment of the integral type reflecting layer are not more than 2, and the grain size grade of the integral type reflecting layer after the solution heat treatment is 4-7 grades. Preferably, when the number of times of the solution heat treatment exceeds 2, the mechanical properties of the monolithic reflective layer cannot be ensured, and the monolithic reflective layer may be discarded.
In the step 6), the flow of the dimensional stabilization treatment is as follows: and (3) placing the integral type reflecting layer of the in-pile member in a heat treatment furnace, heating to 400-450 ℃ for 6-8 hours to release internal stress caused by machining in the integral type reflecting layer of the in-pile member, and cooling the integral type reflecting layer of the in-pile member in the heat treatment furnace after the heat treatment furnace stops heating.
In the step 7), the liquid penetration test flow is as follows: firstly, spraying a penetrant on the surface of an integral reflecting layer to keep the temperature of the integral reflecting layer and the penetrant between 10 and 50 ℃, wherein the retention time of the liquid penetrant is more than 20 minutes; then, removing redundant penetrating agent by using deionized water at the temperature of 10-45 ℃, scrubbing the integral reflecting layer by using sponge or absorbent paper, and naturally drying; and coating a layer of developer on the surface to be detected of the dried integral reflecting layer, and finally observing by naked eyes. Further, spraying a penetrating agent on the surface of the integral reflecting layer of the reactor stack, wherein the temperature of the integral reflecting layer and the penetrating agent of the reactor stack is kept between 10 ℃ and 50 ℃, the residence time of the liquid penetrating agent is at least 20 minutes, and the penetrating agent is required to be kept in a wet state in the whole penetration time; deionized water with the temperature of 10-45 ℃ is used for removing redundant penetrating agent, clean sponge or absorbent paper is used for scrubbing, and water with the pressure of less than 2bar can be used for washing, and natural drying is adopted for preventing over-cleaning; coating a layer of fine and uniform developer on the surface to be detected after drying; and observing under the illumination of not less than 500Lux by naked eyes. The evaluation must be completed within 10 to 30 minutes after drying.
In the step 8), the ultrasonic inspection process includes: firstly, coating a couplant on the surface of the integral reflecting layer, and then inspecting the surface of the integral reflecting layer by a probe with the nominal frequency of 1 MHz-2.5 MHz; and during detection, a direct contact method is adopted in a coupling mode, and coupling compensation, attenuation compensation and curved surface compensation are performed according to actual conditions. Further, coating a coupling agent on the surface of the integral reflecting layer of the in-pile member; inspecting the surface of the integral reflecting layer of the in-pile component by using a probe with the nominal frequency of 1 MHz-2.5 MHz; the diameter of the wafer of the straight probe is phi 10 mm-phi 40mm, and the area of the wafer of the inclined probe is 300mm 2-625 mm 2; the refraction angle (K value) of the oblique probe is generally 35-63 ℃ (K0.7-K2); the grain size and the acoustic characteristic of the reference block for ultrasonic inspection are approximately similar to those of the guide cylinder, and the difference of the attenuation coefficients of the grain size and the acoustic characteristic is not more than 4 Db/m; and during detection, a direct contact method is adopted in a coupling mode, and coupling compensation, attenuation compensation and curved surface compensation are performed according to actual conditions.
Compared with the prior art, the invention has the following advantages and beneficial effects:
based on the laser melting additive manufacturing technology, the traditional section bar production such as plates and bars and the traditional process processing and assembling of parts are cancelled, so that the material and manufacturing period are greatly saved; all bolt fasteners are eliminated, the possibility of fatigue fracture or loosening of the fasteners is eliminated, the inherent reliability of the structure is improved, all connecting welding lines are eliminated, the welding deformation of the structure is avoided, and the forming quality is improved; and the reinforcing rib plate integrally formed with the enclosing plate is arranged at the weak link of the enclosing plate, so that the rigidity of the reactor core reflecting layer structure is improved, the structural continuity of the integrally formed reactor core reflecting layer is good, the mechanical property is better, the manufacturing period is greatly shortened, and the manufacturing process is greatly simplified.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a core reflector with a shroud and a forming ring connected together by bolts;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is an enlarged view A of FIG. 2;
FIG. 4 is a core reflector formed by welding a shroud plate and a forming ring plate;
FIG. 5 is a monolithic core reflector using additive forming.
Reference numbers and corresponding part names in the drawings:
1-enclosing plates; 2-forming a ring plate; 3-a bolt; 4-welding a rib plate; 5-integrally forming a rib plate; 6-integrally forming a coaming; 7-integrally forming the ring plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 to 5, the present embodiment includes the following steps:
1) selecting raw materials for laser melting of the additively manufactured integral reflective layer;
2) compiling an additive manufacturing program according to the size of the integral reflecting layer;
3) performing surface treatment on the substrate for the additive;
4) by taking laser as a heat source, melting and accumulating additive raw materials on a substrate layer by a powder feeding melting method to form an integrally formed coaming plate 6, an integrally formed annular plate 7 and an integrally formed rib plate 5 so as to realize integral reflection layer forming;
5) carrying out solution heat treatment on the integral reflection layer;
6) carrying out size stabilization treatment on the integral reflection layer;
7) performing liquid permeation inspection on the integral reflecting layer;
8) the integral reflective layer is subjected to ultrasonic inspection.
When the integral reflection layer is processed, a laser melting additive manufacturing technology is taken as a basis, according to the standard of RCC-M pressurized water reactor nuclear island mechanical equipment design and construction rules, firstly, raw materials of the integral reflection layer are selected, after the specific size of the integral reflection layer is determined, an additive manufacturing program is compiled, then, the surface of a substrate for additive is polished to provide stable support for the forming of the integral reflection layer, then, laser is taken as a heat source, the integral raw materials are stacked on the substrate layer by a powder feeding melting method to gradually form an integral forming coaming 6, an integral forming annular plate 7 and an integral forming rib plate 5 until the integral reflection layer is completely formed; and then carrying out solution heat treatment on the formed integral type reflecting layer, namely, carrying out heating treatment and subsequent water cooling treatment of a heat treatment furnace to reduce the probability of rusting and corrosion of the integral type reflecting layer, continuously carrying out machining on the integral type reflecting layer until the final size and surface roughness requirements required by a drawing are met, carrying out size stabilization treatment on the integral type reflecting layer after the machining is finished, further determining the final shape and performance of the integral type reflecting layer, and finally verifying whether the formed integral type reflecting layer meets the standard or not through liquid permeation inspection and ultrasonic inspection. Specifically, based on laser melting additive manufacturing technology, the integral reactor core reflecting layer is designed to be an integral forming structure, the coaming 1 and the forming annular plate are connected into a whole body in a mode that fasteners such as bolts 3 and the like or strength welding are not adopted, and based on the additive manufacturing technology, the integral reactor core reflecting layer is piled up layer by layer to be formed, the integral forming rib plate 5 is arranged at a weak link on the periphery of the integral forming coaming 6 and is at the same height as the integral forming coaming 6 and is formed together with the integral forming coaming 6 and the integral forming annular plate 7, and the integral reactor core reflecting layer is obtained.
The conventional reactor core reflecting layer is generally formed by connecting a surrounding plate 1 and a forming ring plate 2 into a whole by using bolts 3, the number of fasteners such as the bolts 3 and pins used in the design is large, and the fasteners have the risks of fatigue fracture and loosening under the long-term irradiation environment in a nuclear reactor; the other scheme is that the coaming 1 and the forming annular plate 2 are connected into a whole by welding, and a plurality of reinforcing rib plates are arranged between the coaming 1 and the forming annular plate 2 for preventing welding deformation and reinforcing integral rigidity, the strength welding seams of the thin plates of the design scheme are more, so that the deformation after welding is larger, and the welding process and the manufacturing period are longer; and through laser melting vibration material disk manufacturing technique in this application for the integrated coaming 6, the integrated annular plate 7 that takes shape and the integrated gusset 5 that takes shape of integral reflection stratum generate simultaneously, make the processing of integral reflection stratum not need traditional forging production and welding, cancelled all full penetration weld joints, avoided the welding deformation of structure, improved the shaping quality, the structural continuity is good, adopted with reactor core reflection stratum waiting high integrated gusset 5, mechanical properties is better, the manufacturing cycle shortens by a wide margin, manufacturing process simplifies greatly.
Example 2
As shown in fig. 5, in the present embodiment, based on embodiment 1, in the step 4), the laser power in the powder feeding melting method is 100 to 4000W, the melting speed is 50 to 200g/h, and the single-layer thickness is 0.1 to 1mm, until the size of additive manufacturing required by design is completed. Furthermore, raw materials are stacked on the substrate layer by layer through a powder feeding melting method, and in the integral type reflecting layer forming process, the laser power is set to be 100-3000W, so that the melting speed of the raw materials is 50-100 g/h, meanwhile, the thickness of single-layer stacking of the raw materials is kept in a range of 0.1-1 mm, and the performance of the finally formed integral type reflecting layer and the chromium coating layer is optimal.
In the step 5), the solution heat treatment process comprises the following steps: and (2) placing the integral type reflecting layer in a heat treatment furnace, heating to 1000-1100 ℃ for 1-4 hours to completely dissolve carbide in the integral type reflecting layer, dissolving carbon element in austenite, taking out the integral type reflecting layer from the heat treatment furnace, and carrying out water cooling treatment on the integral type reflecting layer until the integral type reflecting layer is cooled to enable carbon to reach a supersaturated state. Further, during solution heat treatment, the integral reflecting layer is placed in a heat treatment furnace and heated to 1000-1100 ℃ for 1-4 hours to completely or basically dissolve carbide, carbon element is dissolved in austenite, then the integral reflecting layer is taken out of the heat treatment furnace, and a water cooling mode is used to rapidly cool the integral reflecting layer to room temperature so that carbon reaches a supersaturated state. The heating temperature is 1000-1100 ℃, the purpose is to completely or basically dissolve the carbide, the risk that the carbide causes the stainless steel material of the integral reflecting layer to rust and corrode is avoided, the heat treatment time is 1-4 hours, the carbide can be completely or basically dissolved, and the phenomenon that the stainless steel material is excessively heat treated to cause coarse stainless steel grains and reduced mechanical property can be avoided; the water cooling is adopted to rapidly cool the stainless steel material, and the intercrystalline corrosion temperature interval is avoided.
In the step 5), the times of the solution heat treatment of the integral type reflecting layer are not more than 2, and the grain size grade of the integral type reflecting layer after the solution heat treatment is 4-7 grades. After the times of the solution heat treatment exceed 2 times, the mechanical property of the integral reflecting layer cannot be ensured, and the possibility of scrapping exists.
Example 3
As shown in fig. 5, in this embodiment, based on embodiments 1 and 2, in step 6), the flow of the dimensional stabilization process is as follows: and (3) placing the integral type reflecting layer of the in-pile member in a heat treatment furnace, heating to 400-450 ℃ for 6-8 hours to release internal stress caused by machining in the integral type reflecting layer of the in-pile member, and cooling the integral type reflecting layer of the in-pile member in the heat treatment furnace after the heat treatment furnace stops heating.
In the step 7), the liquid penetration test flow is as follows: spraying a penetrant on the surface of the integral reflecting layer of the in-pile member, wherein the temperature of the integral reflecting layer of the in-pile member and the penetrant is kept between 10 ℃ and 50 ℃, the retention time of the liquid penetrant is at least 20 minutes, and the penetrant is required to be kept in a wet state in the whole penetration time; deionized water with the temperature of 10-45 ℃ is used for removing redundant penetrating agent, clean sponge or absorbent paper is used for scrubbing, and water with the pressure of less than 2bar can be used for washing, and natural drying is adopted for preventing over-cleaning; coating a layer of fine and uniform developer on the surface to be detected after drying; and observing under the illumination of not less than 500Lux by naked eyes. The evaluation must be completed within 10 to 30 minutes after drying.
In the step 8), the ultrasonic inspection process includes: coating a coupling agent on the surface of the integral reflecting layer of the in-pile member; inspecting the surface of the integral reflecting layer of the in-pile component by using a probe with the nominal frequency of 1 MHz-2.5 MHz; the diameter of the wafer of the straight probe is phi 10 mm-phi 40mm, and the area of the wafer of the inclined probe is 300mm 2-625 mm 2; the refraction angle (K value) of the oblique probe is generally 35-63 ℃ (K0.7-K2); the grain size and the acoustic characteristic of the reference block for ultrasonic inspection are approximately similar to those of the guide cylinder, and the difference of the attenuation coefficients of the grain size and the acoustic characteristic is not more than 4 Db/m; and during detection, a direct contact method is adopted in a coupling mode, and coupling compensation, attenuation compensation and curved surface compensation are performed according to actual conditions.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method for forming an integral reflecting layer of a internals is characterized by comprising the following steps:
1) selecting raw materials for laser melting of the additively manufactured integral reflective layer;
2) compiling an additive manufacturing program according to the size of the integral reflecting layer;
3) performing surface treatment on the substrate for the additive;
4) by taking laser as a heat source, melting and accumulating additive raw materials on a substrate layer by a powder feeding melting method to simultaneously form an integrally formed coaming plate (6), an integrally formed annular plate (7) and an integrally formed rib plate (5) so as to realize the forming of an integral reflecting layer;
5) carrying out solution heat treatment on the integral reflection layer;
6) carrying out size stabilization treatment on the integral reflection layer;
7) performing liquid permeation inspection on the integral reflecting layer;
8) carrying out ultrasonic inspection on the integral reflection layer;
in the step 5), the solution heat treatment process comprises the following steps: placing the integral type reflecting layer in a heat treatment furnace, heating to 1000-1100 ℃ for 1h, taking out the integral type reflecting layer from the heat treatment furnace, and carrying out water cooling treatment on the integral type reflecting layer until the integral type reflecting layer is cooled to enable carbon to reach a supersaturated state;
in the step 6), the flow of the dimensional stabilization treatment is as follows: firstly, placing the integral type reflecting layer in a heat treatment furnace, heating to 400-450 ℃ for 6-8 hours to release internal stress caused by machining in the integral type reflecting layer, and cooling the integral type reflecting layer in the heat treatment furnace after the heat treatment furnace stops heating;
in the step 1), the raw material of the integral reflecting layer is Z2CN19-10 powder, the granularity of the Z2CN19-10 powder is 100 meshes-500 meshes, and the nitrogen content of the Z2CN19-10 powder is less than or equal to 0.12%;
in the step 4), the laser power in the powder feeding melting method is 100-3000W, the melting speed is 50-100 g/h, and the single-layer thickness is 0.1-1 mm until the size of additive manufacturing required by design is completed;
in the step 5), the times of the solution heat treatment of the integral type reflecting layer are not more than 2, and the grain size grade of the integral type reflecting layer after the solution heat treatment is 4-7 grades.
2. The method for forming an integral reflective layer of an in-stack structure according to claim 1, wherein: in the step 7), the liquid penetration test flow is as follows: firstly, spraying a penetrant on the surface of an integral reflecting layer to keep the temperature of the integral reflecting layer and the penetrant between 10 and 50 ℃, wherein the retention time of the liquid penetrant is more than 20 minutes; then, removing redundant penetrating agent by using deionized water at the temperature of 10-45 ℃, scrubbing the integral reflecting layer by using sponge or absorbent paper, and naturally drying; and coating a layer of developer on the surface to be detected of the dried integral reflecting layer, and finally observing by naked eyes.
3. The method for forming an integral reflective layer of an in-stack structure according to claim 1, wherein: in the step 8), the ultrasonic inspection process comprises: firstly, coating a couplant on the surface of the integral reflecting layer, and then inspecting the surface of the integral reflecting layer by a probe with the nominal frequency of 1 MHz-2.5 MHz; and during detection, a direct contact method is adopted in a coupling mode, and coupling compensation, attenuation compensation and curved surface compensation are performed according to actual conditions.
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