CN114260464A - Method for preparing high-temperature alloy natural defect group based on SLM method - Google Patents
Method for preparing high-temperature alloy natural defect group based on SLM method Download PDFInfo
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- CN114260464A CN114260464A CN202111678877.2A CN202111678877A CN114260464A CN 114260464 A CN114260464 A CN 114260464A CN 202111678877 A CN202111678877 A CN 202111678877A CN 114260464 A CN114260464 A CN 114260464A
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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
- 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
- B22F10/30—Process control
- B22F10/31—Calibration of process steps or apparatus settings, e.g. before or during 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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Abstract
The invention discloses a method for preparing a high-temperature alloy natural defect group based on an SLM (selective laser melting) method, which comprises the steps of preparing a sample piece by a laser additive manufacturing method, scanning the sample piece to obtain internal defect parameters, and performing reverse deduction according to the internal defect parameters of the sample piece to obtain preparation process parameters of defect sizes so as to obtain stable defect preparation process parameters; the method comprises the steps of setting a defect area in a test piece model to be printed, carrying out slicing processing on the model parameter of the test piece to be printed, adopting different forming process parameters to print and form the defect area and a non-defect area respectively, manufacturing a sample piece meeting the detection requirement of the industrial CT, providing sample support for detection verification and calibration of the industrial CT, and realizing rapid calibration of the industrial CT according to the defect of the set position.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing and forming, and particularly relates to a method for preparing a high-temperature alloy natural defect group based on an SLM (selective laser melting) method.
Background
The laser additive manufacturing is a method for realizing rapid manufacturing of a three-dimensional part entity by taking a high-energy laser beam as a heat source and taking powder feeding or powder spreading as a material supply mode in a layered cladding and layer-by-layer accumulation mode, and can effectively shorten the production period and reduce the part processing cost. In addition, the laser additive manufacturing technology can also realize the rapid repair and remanufacture of the worn parts.
The selective laser melting additive manufacturing technology is in a non-equilibrium state, alloy powder instantaneously undergoes melting and solidification processes under the action of laser beams, a forming process relates to a series of complex physical, chemical and metallurgical phenomena, and various forms of heat transfer, mass transfer and flow exist, so that natural defects which are randomly distributed exist in a formed part, and common types of the defects comprise air holes, non-fusion and the like. Industrial CT can be used to detect internal defects of a structural sample, and a series of natural defects need to be made inside the sample in order to verify and calibrate CT equipment. Meanwhile, the defect position, angle and defect size prepared in the sample are required to be controllable, the defect can be calibrated, and the method is used for researching the technical defect of laser additive manufacturing.
Disclosure of Invention
The invention aims to provide a method for preparing a high-temperature alloy natural defect group based on an SLM method, so as to overcome the defects of the prior art.
A method for preparing a high-temperature alloy natural defect group based on an SLM method comprises the following steps:
s1, preparing a sample piece by adopting a laser additive manufacturing method, and scanning the sample piece to obtain internal defect parameters;
s2, reversely deducing the defect parameters in the sample piece to obtain the preparation process parameters of the defect size;
s3, setting a defect area in the test piece model to be printed, slicing the parameters of the test piece model to be printed in the defect area, printing and forming the defect area by adopting the preparation process parameters obtained in the step S2, and printing the non-defect area of the test piece model to be printed by adopting the parameters different from the preparation process parameters obtained in the step S2 to obtain the test piece with natural defect aggregation.
Furthermore, the technological parameters of the defect positions in all the test samples corresponding to the defect generation are obtained by data statistics.
Furthermore, the corresponding process parameter with obvious defect generation is selected from the multiple defect process parameters and is the preparation process parameter of the defect size.
Furthermore, the material Magics software is adopted to process the test piece model to be printed and set a defect area.
Furthermore, an industrial CT is adopted to scan the sample piece to obtain the internal defect parameters.
Furthermore, the technological parameters of generating the defects corresponding to the defect-free parts in all the test samples are obtained by adopting data statistics.
Further, the non-defective part is formed by using the process parameters of the non-defective part corresponding to the part to be formed.
Further, the sample piece adopts a metallographic square with the size of 10mm × 10mm × 10 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a method for preparing a high-temperature alloy natural defect group based on an SLM (selective laser melting) method, which is characterized in that a sample piece is prepared by a laser additive manufacturing method, internal defect parameters are obtained by scanning the sample piece, and preparation process parameters of defect sizes are obtained by back-stepping according to the internal defect parameters of the sample piece, so that stable defect preparation process parameters are obtained; the method comprises the steps of setting a defect area in a test piece model to be printed, carrying out slicing processing on the model parameter of the test piece to be printed, adopting different forming process parameters to print and form the defect area and a non-defect area respectively, manufacturing a sample piece meeting the detection requirement of the industrial CT, providing sample support for detection verification and calibration of the industrial CT, and realizing rapid calibration of the industrial CT according to the defect of the set position.
Furthermore, data statistics is adopted to obtain technological parameters of the defects generated corresponding to the defect positions in all the test samples, and stable defect forming parameters are obtained.
Furthermore, the sample piece adopts a metallographic square with the size of 10mm multiplied by 10mm, the forming structure is small, corresponding process parameters can be quickly and accurately obtained, and the influence of temperature change in the forming process of the part is small.
Drawings
FIG. 1 is a diagram illustrating the results of preparing natural defects in an embodiment of the present invention.
FIG. 2 is a model diagram and a physical diagram of a sample part for natural defect aggregation according to an embodiment of the present invention.
FIG. 3 is a CT image of a sample of natural defect clusters obtained according to the method.
FIG. 4 is a cut-away view of a sample of natural defect clusters obtained according to the method.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
in order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention relates to a method for preparing a high-temperature alloy natural defect group based on an SLM method, which comprises the following steps:
s1, printing a series of metallographic squares of 10mm multiplied by 10mm by adopting laser additive manufacturing equipment, detecting internal defects of the printed metallographic squares by utilizing industrial CT, and then counting laser additive molding data for generating the internal defects to obtain defect manufacturing process parameters;
preparing a plurality of test sample pieces with the same size by adopting laser additive manufacturing process parameters, carrying out full CT detection on the test sample pieces, and acquiring process parameters of defects generated by corresponding defect positions in all the test samples by adopting data statistics; selecting corresponding process parameters with obvious defects from a plurality of defect process parameters as preparation process parameters of the defect size of the application; or acquiring defect size preparation process parameters by adopting an experimental method;
similarly, the technological parameters of the defect-free part corresponding to the defect in all the test samples can be obtained by data statistics, and the technological parameters of the defect-free part corresponding to the department can be used for forming the defect-free part.
S2, setting the shape, size and angle of the defect gathering area in the printing part model by using Materialise Magics software;
adopting three-dimensional software to scratch a region in the test piece model to be printed on the basis of the parameters of the test piece model to be printed; the shape, angle and size of the defect area are set according to experimental requirements.
And S3, adopting different process parameters to print the test piece to be printed and the defect gathering area inside the test piece to be printed in the additive manufacturing process, and carrying out partition printing on the sample piece to obtain the high-temperature alloy forming piece with natural defect gathering.
In view of the above-mentioned natural defect group production method,
the first step is as follows: setting a defect area in a small sample of 10mm multiplied by 10mm by using three-dimensional software magics, wherein the size of the defect area is 5mm multiplied by 0.3mm and the size of the defect area is 0.1mm multiplied by 6mm as shown in figure 1; the defect region angles are 0 °, 45 °, 90 °, as shown in fig. 2.
The second step is that: the defect area adopts the natural defect result shown in FIG. 1 corresponding to the number of formed process samples, small samples with the thickness of 10mm multiplied by 10mm are printed by adopting compact and non-defective process parameters, the laser power is 260W, the scanning speed is 810mm/s, the scanning interval is 0.1mm, and the layer thickness is 40 um.
The third step: the internal defects of a small sample of 10mm × 10mm × 10mm were detected by industrial CT, and the results are shown in FIG. 3 below. The internal defects of the sample were observed by an optical microscope and a scanning electron microscope, and the results are shown in FIG. 4 below.
The invention relates to a method for preparing a high-temperature alloy natural defect group based on an SLM (selective laser melting) method, which is characterized in that a defect preparation process is obtained through a sampling method, a defect area is set in a test piece model to be printed through software analysis, the defect area and a non-defect area in the test piece model to be printed are prepared and molded by adopting different preparation process parameters, a natural defect group in a sample can be obtained by adopting a region molding mode with different energy densities by utilizing the principle that the energy density is small and the natural defect is easy to generate in the sample in the additive manufacturing process, and the shape, the position and the angle of the natural defect group can be adjusted; the method for manufacturing the natural defect group in the sample can manufacture the sample meeting the detection requirement of the industrial CT, can provide sample support for detection verification and calibration of the industrial CT, and can realize quick calibration of the industrial CT according to the defects of the set position.
Claims (8)
1. A method for preparing a high-temperature alloy natural defect group based on an SLM method is characterized by comprising the following steps:
s1, preparing a sample piece by adopting a laser additive manufacturing method, and scanning the sample piece to obtain internal defect parameters;
s2, reversely deducing the defect parameters in the sample piece to obtain the preparation process parameters of the defect size;
s3, setting a defect area in the test piece model to be printed, slicing the parameters of the test piece model to be printed in the defect area, printing and forming the defect area by adopting the preparation process parameters obtained in the step S2, and printing the non-defect area of the test piece model to be printed by adopting the parameters different from the preparation process parameters obtained in the step S2 to obtain the test piece with natural defect aggregation.
2. The method for preparing the high-temperature alloy natural defect group based on the SLM method as claimed in claim 1, wherein data statistics is adopted to obtain process parameters corresponding to the defect positions in all the test samples.
3. The method for preparing the high-temperature alloy natural defect group based on the SLM method as claimed in claim 2, wherein the corresponding process parameter with obvious defect generation is selected from a plurality of defect process parameters and is the preparation process parameter of the defect size.
4. The method for preparing high-temperature alloy natural defect groups based on the SLM method as claimed in claim 1, wherein a material Magics software is adopted to process a test piece model to be printed and set defect regions.
5. The SLM method, as claimed in claim 1, wherein the sample piece is scanned by industrial CT to obtain internal defect parameters.
6. The SLM-based method for preparing high-temperature alloy natural defect groups according to claim 1, wherein data statistics are used to obtain process parameters corresponding to the defect generation of defect-free parts in all test samples.
7. The method for preparing the high-temperature alloy natural defect group based on the SLM method as claimed in claim 1, wherein the forming of the defect-free part is performed by using the process parameters of the defect-free part corresponding to the generation of the defect-free part.
8. The SLM-based method for preparing high temperature alloy natural defect groups as claimed in claim 1, wherein the sample piece is a metallographic square with dimensions of 10mm x 10 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4299215A1 (en) * | 2022-06-30 | 2024-01-03 | General Electric Technology GmbH | Calibration component for a turbomachine having representative quality indicators |
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| EP3646968A1 (en) * | 2018-10-30 | 2020-05-06 | Siemens Aktiengesellschaft | Method for automatically preventing defects potentially arising during an additive manufacturing process and manufacturing device |
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| CN111207985A (en) * | 2020-04-22 | 2020-05-29 | 中国航发上海商用航空发动机制造有限责任公司 | Nondestructive testing method for crack defects, testing standard part and manufacturing method thereof |
| CN111203538A (en) * | 2020-04-22 | 2020-05-29 | 中国航发上海商用航空发动机制造有限责任公司 | Prefabricated crack defect, preparation method of built-in crack defect and prefabricated part |
| CN112548119A (en) * | 2020-12-02 | 2021-03-26 | 中国科学院金属研究所 | Method for regulating and controlling selective laser melting forming titanium alloy process based on defect form |
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2021
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Patent Citations (6)
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| CN108436081A (en) * | 2018-03-06 | 2018-08-24 | 无锡市产品质量监督检验院 | A kind of test button 3D printing manufacturing process of preset defect |
| EP3646968A1 (en) * | 2018-10-30 | 2020-05-06 | Siemens Aktiengesellschaft | Method for automatically preventing defects potentially arising during an additive manufacturing process and manufacturing device |
| CN111203539A (en) * | 2020-04-22 | 2020-05-29 | 中国航发上海商用航空发动机制造有限责任公司 | Preparation method of prefabricated air hole defect and built-in air hole defect and prefabricated part |
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Cited By (1)
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| EP4299215A1 (en) * | 2022-06-30 | 2024-01-03 | General Electric Technology GmbH | Calibration component for a turbomachine having representative quality indicators |
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