CN114713843B - Forming method of high helium brittleness resistant 304L stainless steel member - Google Patents
Forming method of high helium brittleness resistant 304L stainless steel member Download PDFInfo
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- CN114713843B CN114713843B CN202210334246.7A CN202210334246A CN114713843B CN 114713843 B CN114713843 B CN 114713843B CN 202210334246 A CN202210334246 A CN 202210334246A CN 114713843 B CN114713843 B CN 114713843B
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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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
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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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a forming method of a high helium brittleness resistant 304L stainless steel member, which comprises the following steps: siC powder, siN powder and Y are deposited by a multi-channel powder bed laser deposition forming method 2 O 3 The mixed powder obtained after powder premixing and 304L stainless steel powder are directly and synchronously co-deposited to obtain a stainless steel member, wherein the stainless steel member has C, N and nanometer Y 2 O 3 Uniformly distributed sub-nano step microstructure organization characteristics. The stainless steel member formed by the method has strong helium brittleness resistance, and compared with the stainless steel member manufactured by the traditional method, the helium brittleness resistance can be improved by 30-80%.
Description
Technical Field
The invention belongs to the field of nuclear power, and particularly relates to a forming method of a 304L stainless steel member with strong helium brittleness resistance.
Background
3D printing is a manufacturing technology for directly, quickly and accurately forming parts by adding stacking materials layer by layer under the control of a computer according to three-dimensional modeling by means of laser or electron beams and the like, and is also called additive manufacturing. The additive manufacturing technology does not need traditional cutters, clamps and a plurality of processing procedures, can rapidly and accurately manufacture parts with any complex shape on one device by utilizing three-dimensional design data, has extremely good material utilization rate compared with the traditional processing technology of material removal (or deformation) and the common special processing technology, and is mainly applied to the fields of direct forming, surface coating, remanufacturing repair and the like as a rapid additive manufacturing technology. The technology has the outstanding advantages of high stability, no need of vacuum environment, moderate cost, convenience for coaxial on-line monitoring and the like, so that the technology is widely applied. Compared with the traditional welding method, the DLD technology has the advantages of concentrated heat source, reliable deposition quality and small heat input, the forming process has small influence on the matrix base material, and the high-performance precise connection applied to the functional components is gradually expanded in recent years. However, in the prior art, the helium embrittlement resistance of the 304L stainless steel member obtained by conventional 3D printing is poor.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for forming a 304L stainless steel member that is resistant to helium embrittlement.
The invention provides a forming method of a high helium brittleness resistant 304L stainless steel member, which has the characteristics that the method comprises the following steps: siC powder, siN powder and Y are deposited by a multi-channel powder bed laser deposition forming method 2 O 3 The mixed powder obtained after powder premixing and 304L stainless steel powder are directly and synchronously co-deposited to obtain a stainless steel member, wherein the stainless steel member has C, N and nanometer Y 2 O 3 Uniformly distributed sub-nano step microstructure organization characteristics.
In the method for forming the high helium embrittlement resistance 304L stainless steel member provided by the invention, the method can also have the following characteristics: in the multi-channel powder bed laser deposition forming method, 2 or more channels are arranged when powder is conveyed, and mixed powder and 304L stainless steel powder are synchronously sent out through different channels in the synchronous codeposition process.
In the method for forming the high helium embrittlement resistance 304L stainless steel member provided by the invention, the method can also have the following characteristics: wherein, the granularity of the 304L stainless steel powder is 80-150 mu m, and the size is Gaussian distribution.
In the method for forming the high helium embrittlement resistance 304L stainless steel member provided by the invention, the method can also have the following characteristics: wherein the granularity of the SiC powder is 13 mu m, and the granularity of the SiN powder is 30nm.
In the method for forming the high helium embrittlement resistance 304L stainless steel member provided by the invention, the method can also have the following characteristics: wherein Y is 2 O 3 The particle size of the powder was 25nm.
The method for forming the 304L stainless steel member with strong helium brittleness resistance provided by the invention can also comprise the following steps ofIs characterized by: wherein, siC powder, siN powder and Y 2 O 3 The powder premixing method is that ultrasonic dispersion is carried out after mechanical premixing, siC powder, siN powder and Y powder are mixed 2 O 3 The mass ratio of the powder is 40:10:3.
in the method for forming the high helium embrittlement resistance 304L stainless steel member provided by the invention, the method can also have the following characteristics: wherein, when synchronous codeposition is carried out, the technological parameters are as follows: the laser power was 600W, the supply rate of 304L stainless steel powder was 500mm/min, and the supply rate of the mixed powder was 500mm/min.
Effects and effects of the invention
According to the forming method of the high helium brittleness resistant 304L stainless steel member, siC powder, siN powder and Y are subjected to a multi-channel powder bed laser deposition forming method 2 O 3 The mixed powder obtained after powder premixing and 304L stainless steel powder are directly and synchronously co-deposited to obtain a stainless steel member, wherein the stainless steel member has C, N and nanometer Y 2 O 3 The microstructure features of the uniformly distributed sub-nano step microstructure can be used as defect precipitation, so that helium bubble nucleation and growth can be effectively inhibited, and the harmful influence of helium agglomeration is minimized. The stainless steel member formed by the method has strong helium brittleness resistance, and compared with the stainless steel member manufactured by the traditional method, the helium brittleness resistance can be improved by 30-80%.
Drawings
FIG. 1 is a microstructure of a strong helium embrittlement resistant stainless steel component made in an example of the present invention;
FIG. 2 is a microstructure of 304L stainless steel conventionally prepared in comparative example 1 of the present invention.
Detailed Description
In order to make the technical means and effects of the present invention easy to understand, the present invention will be specifically described with reference to the following examples and the accompanying drawings.
< example >
The forming method of the high helium brittleness resistant 304L stainless steel member comprises the following steps:
forming device using TruLaser Cell7040Laser deposition forming method of multi-channel powder bed, which comprises the steps of mixing SiC powder, siN powder and Y 2 O 3 And directly and synchronously co-depositing the mixed powder obtained after powder premixing and 304L stainless steel powder to obtain the stainless steel member. The process parameters for the simultaneous co-deposition are as follows: the laser power is 600W, the feeding rate of the 304L stainless steel powder is 500mm/min, the feeding rate of the mixed powder is 500mm/min, the layer thickness is 0.7mm, the included angle of the groove is 60 degrees, and the gap between the groove groups is not more than 0.2mm.
Wherein the content of SiC powder is 4wt%, the content of SiN powder is 1wt%, and Y 2 O 3 The powder content is 0.3wt%, and other parameters of the powder are the same as those of the conventional powder in the market.
The obtained stainless steel member has C, N and nanometer Y 2 O 3 Uniformly distributed sub-nano step microstructure structure characteristics are shown as C, N distributed at the positions of sub-grain boundaries and grain boundaries of micron cellular structure, and nano Y is formed 2 O 3 Is distributed in the grain boundary to form a unique micro-nano scale ladder structure.
In this embodiment, the process parameters may be optimized based on different manufacturer or model equipment to perform DLD shaping within the laser power range.
FIG. 1 is a microstructure of a strong helium embrittlement resistant stainless steel component made in an example of the present invention.
As shown in FIG. 1, the method for forming the 304L stainless steel member with strong helium embrittlement resistance can prepare the stainless steel member with strong helium embrittlement resistance, and the helium embrittlement resistance of the stainless steel member is improved by 50% compared with that of a member made of the same material through a traditional casting mode.
Comparative example 1 ]
In the preparation method of comparative example 1, siC powder and SiN powder were not added at the time of premixing, and the rest of the procedure was the same as in example.
FIG. 2 is a microstructure of 304L stainless steel conventionally prepared in comparative example 1 of the present invention.
As shown in fig. 2, the structure of the member obtained in this comparative example 1 was coarse in crystal grains, and the helium embrittlement resistance of the member was only 20%.
Comparative example 2 ]
Comparative example2, Y is not added during premixing 2 O 3 Powder, the rest of the procedure is the same as in the examples.
The structure of the member obtained in comparative example 2 had coarse inclusions, and the helium embrittlement resistance of the member was only 20%.
Comparative example 3 ]
In the preparation method of comparative example 3, the SiC powder content was 2wt%, the SiN powder content was 0.2wt%, and Y 2 O 3 The content was 0.1wt%, and the rest of the procedure was the same as in example.
The helium embrittlement resistance of the member obtained in this comparative example 3 was only 25%.
Comparative example 4 ]
The preparation method of comparative example 4 does not use a multi-channel powder bed laser deposition molding method, and the rest of the steps are the same as in example.
The structure of the member obtained in comparative example 4 had coarse grains, no C, N and nano Y 2 O 3 The uniformly distributed sub-nano step microstructure has poor helium embrittlement resistance.
Comparative example 5 ]
In the preparation method of the comparative example 5, the synchronous co-deposition is carried out without adopting the following technological parameters that the laser power is 600W, the supply rate of the 304L stainless steel powder is 500mm/min, the supply rate of the mixed powder is 500mm/min, the layer thickness is 0.7mm, the included angle of the groove is 60 degrees, and the gap between the groove groups is not more than 0.2mm. The remaining steps are the same as in the examples.
The helium embrittlement resistance of the member obtained in this comparative example 5 was only 25%.
Comparative analysis of the stainless steel members prepared according to examples and comparative examples 1 to 5 showed higher resistance to helium embrittlement only by the stainless steel member obtained by the method for forming a 304L stainless steel member having high resistance to helium embrittlement according to the present invention. The stainless steel member prepared by the invention has C, N and nanometer Y 2 O 3 Uniformly distributed sub-nano step microstructure structure characteristics are shown as C, N distributed at the positions of sub-grain boundaries and grain boundaries of micron cellular structure, and nano Y is formed 2 O 3 Is distributed in the grain boundary to form a unique micro-nano scale ladder structure.Compared with the stainless steel member manufactured by the traditional method, the helium brittleness resistance can be improved by 30-80%.
Effects and effects of the examples
According to the method for forming the 304L stainless steel member with strong helium brittleness resistance according to the embodiment, siC powder, siN powder and Y powder are subjected to a multi-channel powder bed laser deposition forming method 2 O 3 The mixed powder obtained after powder premixing and 304L stainless steel powder are directly and synchronously co-deposited to obtain a stainless steel member, wherein the stainless steel member has C, N and nanometer Y 2 O 3 The microstructure features of the uniformly distributed sub-nano step microstructure can be used as defect precipitation, so that helium bubble nucleation and growth can be effectively inhibited, and the harmful influence of helium agglomeration is minimized. The stainless steel member formed by the embodiment has strong helium brittleness resistance, and compared with the stainless steel member manufactured by the traditional mode, the helium brittleness resistance can be improved by 30% -80%.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (5)
1. A method for forming a high helium embrittlement resistant 304L stainless steel member, comprising the steps of: siC powder, siN powder and Y are deposited by a multi-channel powder bed laser deposition forming method 2 O 3 The mixed powder obtained after powder premixing and 304L stainless steel powder are directly and synchronously co-deposited to obtain a stainless steel member,
wherein the stainless steel member has C, N and nanometer Y 2 O 3 Uniformly distributed sub-nano step microstructure structure characteristics, wherein the sub-nano step microstructure structure characteristics are C, N distributed at the positions of sub-grain boundaries and grain boundaries of micron cellular structure, and nano Y is formed 2 O 3 Is distributed in the grain boundary,
the SiC powder, the SiN powder and the Y 2 O 3 The powder premixing method comprises the steps of mechanically premixing, and then performing ultrasonic dispersion, wherein the SiC powder, the SiN powder and the Y powder are prepared 2 O 3 The mass ratio of the powder is 40:10:3,
when the synchronous codeposition is carried out, the process parameters are as follows: the laser power is 600W, the feeding rate of the 304L stainless steel powder is 500mm/min, and the feeding rate of the mixed powder is 500mm/min.
2. The method of forming a high helium embrittlement resistant 304L stainless steel member according to claim 1, wherein:
in the multi-channel powder bed laser deposition forming method, 2 or more channels are arranged when powder is conveyed, and in the synchronous codeposition process, the mixed powder and the 304L stainless steel powder are synchronously sent out through different channels.
3. The method of forming a high helium embrittlement resistant 304L stainless steel member according to claim 1, wherein:
wherein the granularity of the 304L stainless steel powder is 80-150 mu m, and the sizes are distributed in Gaussian.
4. The method of forming a high helium embrittlement resistant 304L stainless steel member according to claim 1, wherein:
wherein the granularity of the SiC powder is 13 mu m, and the granularity of the SiN powder is 30nm.
5. The method of forming a high helium embrittlement resistant 304L stainless steel member according to claim 1, wherein:
wherein the Y is 2 O 3 The particle size of the powder was 25nm.
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Citations (8)
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|---|---|---|---|---|
| US4818485A (en) * | 1987-02-11 | 1989-04-04 | The United States Of America As Represented By The United States Department Of Energy | Radiation resistant austenitic stainless steel alloys |
| US6391251B1 (en) * | 1999-07-07 | 2002-05-21 | Optomec Design Company | Forming structures from CAD solid models |
| CN1411942A (en) * | 2002-03-21 | 2003-04-23 | 西北工业大学 | Component and tissue controllable laser stereoforming method |
| CN102994884A (en) * | 2012-12-03 | 2013-03-27 | 东北大学 | Efficient preparation method for nanostructure oxide dispersion strengthening steel |
| CN105772723A (en) * | 2016-04-18 | 2016-07-20 | 西安智熔金属打印系统有限公司 | Rapid prototyping system and method of gradient material structure |
| CN105803454A (en) * | 2016-05-10 | 2016-07-27 | 贵州大学 | Composite coating material based on 45# steel substrate and preparing method of coating |
| CN106563804A (en) * | 2016-10-12 | 2017-04-19 | 机械科学研究总院先进制造技术研究中心 | Laser-targeting multi-metal fused deposition additive manufacturing process and device |
| CN113319270A (en) * | 2021-04-28 | 2021-08-31 | 广州鑫研锦增材科技有限公司 | Additive manufacturing oriented particle reinforced 17-4PH material and forming method thereof |
-
2022
- 2022-03-31 CN CN202210334246.7A patent/CN114713843B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818485A (en) * | 1987-02-11 | 1989-04-04 | The United States Of America As Represented By The United States Department Of Energy | Radiation resistant austenitic stainless steel alloys |
| US6391251B1 (en) * | 1999-07-07 | 2002-05-21 | Optomec Design Company | Forming structures from CAD solid models |
| CN1411942A (en) * | 2002-03-21 | 2003-04-23 | 西北工业大学 | Component and tissue controllable laser stereoforming method |
| CN102994884A (en) * | 2012-12-03 | 2013-03-27 | 东北大学 | Efficient preparation method for nanostructure oxide dispersion strengthening steel |
| CN105772723A (en) * | 2016-04-18 | 2016-07-20 | 西安智熔金属打印系统有限公司 | Rapid prototyping system and method of gradient material structure |
| CN105803454A (en) * | 2016-05-10 | 2016-07-27 | 贵州大学 | Composite coating material based on 45# steel substrate and preparing method of coating |
| CN106563804A (en) * | 2016-10-12 | 2017-04-19 | 机械科学研究总院先进制造技术研究中心 | Laser-targeting multi-metal fused deposition additive manufacturing process and device |
| CN113319270A (en) * | 2021-04-28 | 2021-08-31 | 广州鑫研锦增材科技有限公司 | Additive manufacturing oriented particle reinforced 17-4PH material and forming method thereof |
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