CN107389447B - Tensile sample manufactured by metal additive - Google Patents
Tensile sample manufactured by metal additive Download PDFInfo
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- CN107389447B CN107389447B CN201710565296.5A CN201710565296A CN107389447B CN 107389447 B CN107389447 B CN 107389447B CN 201710565296 A CN201710565296 A CN 201710565296A CN 107389447 B CN107389447 B CN 107389447B
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- clamping end
- gauge length
- length part
- lower clamping
- transition area
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- 239000000654 additive Substances 0.000 title claims abstract description 31
- 230000000996 additive effect Effects 0.000 title claims abstract description 31
- 239000002184 metal Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 230000007704 transition Effects 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 230000007480 spreading Effects 0.000 claims description 7
- 238000003892 spreading Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
-
- 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
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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
- B33Y80/00—Products made by additive manufacturing
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a metal additive manufacturing tensile sample, which comprises: the lower clamping end is of a metal plate structure with the upper surface and the lower surface parallel to each other; the gauge length part is a cylinder with the diameter of micron level and the length of millimeter level, and the axis of the gauge length part is vertical to the upper surface of the lower clamping end; the transition area is arranged between the lower clamping end and the gauge length part so as to enable the upper surface of the lower clamping end to be in smooth transition with the surface of the cylinder of the gauge length part; and the diameter of the upper end surface of the upper clamping end is larger than that of the gauge length part, the part of the upper clamping end, which is far away from the upper end surface, is connected with the gauge length part, and the joint of the upper clamping end and the gauge length part is in smooth transition, wherein the transition region, the gauge length part and the upper clamping end are manufactured and molded by paving powder of a material to be evaluated on the surface of the lower clamping end and utilizing a selective laser melting technology in an additive manufacturing mode. The tensile sample can reduce the dosage of additive manufacturing powder, reduce the material cost and shorten the test period.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a tensile sample manufactured by metal additive manufacturing.
Background
Additive manufacturing is a revolutionary process that has developed over the last three decades, with selective laser melting being one of the primary metal additive manufacturing processes. Unlike the traditional material reducing manufacturing process, the method is a manufacturing process in which powder is melted point by point from line to plane under the action of a heat source and is accumulated layer by layer. The additive manufacturing process of a component undergoes numerous rapid heating and cooling processes, and the local thermal history strongly influences the structure and performance of the component.
Due to the wide variety of product structural forms and dimensions that are formed using additive manufacturing, the thermal history experienced by different products can vary greatly. At present, the characterization of the mechanical properties of materials or molded parts prepared by additive manufacturing is realized by printing a traditional tensile test piece and performing a tensile test on a tensile testing machine. However, the thermal history experienced with conventional forms of tensile specimens formed by additive manufacturing does not accurately reflect the thermal history experienced during additive manufacturing of the product. Thus, the printed conventional tensile test pieces do not represent the mechanical properties of the materials prepared by additive manufacturing and the shaped products.
In addition, conventional stretch specimen molding using the selective laser melting technique not only requires a long molding time, but also requires additional specimen preparation time since the stretch specimen must be cut from the substrate, which not only increases the amount of powder used but also requires a long time.
Disclosure of Invention
The invention aims to provide a metal additive manufactured tensile sample, which can reduce material cost and shorten test period.
To achieve this object, the present invention provides a metal additive manufactured tensile specimen comprising: the lower clamping end is of a metal plate structure with the upper surface and the lower surface parallel to each other; the gauge length part is a cylinder with the diameter of micron level and the length of millimeter level, and the axis of the gauge length part is vertical to the upper surface of the lower clamping end; the transition area is arranged between the lower clamping end and the gauge length part so as to enable the upper surface of the lower clamping end to be in smooth transition with the surface of the cylinder of the gauge length part; and the diameter of the upper end surface of the upper clamping end is larger than that of the gauge length part, the part of the upper clamping end, which is far away from the upper end surface, is connected with the gauge length part, and the joint of the upper clamping end and the gauge length part is in smooth transition, wherein the transition region, the gauge length part and the upper clamping end are manufactured and molded by paving powder of a material to be evaluated on the upper surface of the lower clamping end and utilizing a selective laser melting technology in an additive manufacturing mode.
Preferably, the transition area is a revolving body formed by a section of circular arc rotating around the axis of the gauge length part for a circle, and two ends of the circular arc are respectively tangent to the cylindrical surface of the gauge length part and the upper surface of the lower clamping end.
Preferably, the radius of the circular arc is 1mm-2 mm.
Preferably, the upper clamping end is a solid of revolution formed by a curve formed by two tangent arcs rotating around the axis of the gauge length part for one circle.
Preferably, one end of the curve near the gauge length portion is tangent to the surface of the gauge length portion.
Preferably, the radii of two tangent arcs on the curve are both 0.5mm-1 mm.
Preferably, the diameter of the gauge length part is 200-500 microns, the powder spreading thickness of the material to be evaluated is 20-70 microns, and the length of the gauge length part is integral multiple of the powder spreading thickness.
Preferably, the material compositions of the lower clamping end, the transition area, the gauge length part and the upper clamping end are the same or similar, so that the lower clamping end and the transition area can realize reliable metallurgical connection under the action of laser.
The tensile sample manufactured by the metal additive can reduce the using amount of additive manufacturing powder, reduce the material cost and shorten the test period, and is particularly suitable for the mechanical property characterization of a selective laser melting preparation material, the rapid material selection of an additive manufacturing product and the evaluation of process parameters.
Drawings
Fig. 1 is a schematic structural diagram of a metal additive manufacturing tensile specimen according to an embodiment of the invention;
fig. 2 is an enlarged view of the area a in fig. 1.
Detailed Description
The technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings, and it is to be understood that the contents described herein are only for illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a schematic structural diagram of a metal additive manufacturing tensile sample based on a selective laser melting technology according to the present invention, and fig. 2 is an enlarged view of a region a in fig. 1.
As shown in fig. 1 and 2, a metal additive manufacturing tensile specimen includes: the device comprises a lower clamping end 1, a scale distance part 2, a transition area 3 and an upper clamping end 4, wherein the transition area 3, the scale distance part 2 and the upper clamping end 4 are manufactured and molded in an additive mode by laying powder of a material to be evaluated on the upper surface of the lower clamping end 1 and utilizing a selective laser melting technology.
Wherein, the lower clamping end 1 is set to be a metal plate structure with the upper surface and the lower surface parallel.
The gauge length part 2 is a cylinder with the diameter of micron level and the length of millimeter level, and the axis of the cylinder is vertical to the upper surface of the lower clamping end 1.
The transition area 3 is arranged between the lower clamping end 1 and the gauge length part 2, so that the upper surface of the lower clamping end 1 and the cylindrical surface of the gauge length part 2 are in smooth transition. Specifically, the transition area 3 is a solid of revolution formed by rotating a circular arc 5 around the axis of the gauge length part 2, and both ends of the circular arc 5 are respectively tangent to the cylindrical surface of the gauge length part 2 and the upper surface of the lower clamping end 1, as shown in fig. 2, the radius of the circular arc 5 may be 1mm-2mm, but is not limited thereto, depending on the specific application.
The diameter of the upper end face of the upper clamping end 4 is larger than that of the gauge length part 2, the part of the upper clamping end far away from the upper end face is connected with the gauge length part 2, and the connection part of the upper clamping end and the gauge length part is in smooth transition. Specifically, the upper clamping end 4 is a solid of revolution formed by a curve 6 formed by two tangent arcs rotating around the axis of the gauge part 2, and one end of the curve 6 close to the gauge part 2 is tangent to the surface of the gauge part 2. The radii of the two tangent arcs on the curve 6 may be both 0.5mm-1mm, and the radii of the two arcs may be the same or different, and are not limited herein.
In addition, the material compositions of the lower clamping end 1, the transition area 3, the gauge length part 2 and the upper clamping end 4 are the same or similar, so that reliable metallurgical connection between the lower clamping end 1 and the transition area 3 is realized under the action of laser.
In this embodiment, the diameter of the gauge length portion 2 may be 200-500 microns, the powder spreading thickness of the material to be evaluated is 20-70 microns, and the length of the gauge length portion 2 is an integral multiple of the powder spreading thickness, and may be, for example, 3mm-20 mm. The lower clamping end 1 corresponding to each tensile sample is a metal plate with a certain size so as to clamp the tensile sample for tensile property test, and mechanical property indexes such as elastic modulus, yield strength, tensile strength and the like of the material prepared based on selective laser melting are obtained. The lower clamping end 1 is made of a substrate of the selective laser melting equipment, and the size and the shape of the lower clamping end are related to the model of the selective laser melting equipment, for example, the length, the width and the height can be 125mm multiplied by 25 mm. The dimensions of the tensile sample are merely exemplary, and are not limited thereto, and may be determined according to the actual application.
Compared with the traditional tensile sample, the metal additive manufacturing tensile sample in the embodiment has small size, the diameter of the gauge length part 2 is only micron-sized, the additive manufacturing powder consumption can be reduced, the tensile sample does not need to be cut from a substrate, the test cost and time are saved, and the metal additive manufacturing tensile sample is particularly suitable for mechanical property characterization of selective laser melting preparation materials, rapid material selection of additive manufacturing products and evaluation of process parameters.
The foregoing embodiments are illustrative of the present invention and the principles and techniques employed therein. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (3)
1. A metal additive manufactured tensile specimen, comprising:
the lower clamping end (1) is of a metal plate structure with the upper surface and the lower surface parallel to each other, and the lower clamping end (1) is made of a substrate of selective laser melting equipment;
the gauge length part (2) is arranged to be a micron-sized cylinder with the diameter and the length being a millimeter-sized cylinder, and the axis of the gauge length part is perpendicular to the upper surface of the lower clamping end (1);
the transition area (3) is arranged between the lower clamping end (1) and the gauge length part (2) so as to enable the upper surface of the lower clamping end (1) to be in smooth transition with the cylindrical surface of the gauge length part (2);
the diameter of the upper end surface of the upper clamping end (4) is larger than that of the gauge length part (2), the part of the upper clamping end far away from the upper end surface is connected with the gauge length part (2), the connection part of the upper clamping end and the gauge length part is in smooth transition,
wherein the transition area (3), the gauge length part (2) and the upper clamping end (4) are formed by spreading powder of a material to be evaluated on the upper surface of the lower clamping end (1) and performing additive manufacturing by using a selective laser melting technology;
the transition area (3) is a revolving body formed by rotating a section of circular arc (5) for a circle around the axis of the gauge length part (2), and two ends of the circular arc (5) are respectively tangent to the cylindrical surface of the gauge length part and the upper surface of the lower clamping end (1);
the upper clamping end (4) is a revolving body formed by a curve (6) formed by two tangent arc lines rotating for one circle around the axis of the gauge length part (2); one end of the curve (6) close to the gauge length part (2) is tangent to the surface of the gauge length part (2);
the diameter of the gauge length part (2) is 200-500 microns, the powder spreading thickness of the material to be evaluated is 20-70 microns, and the length of the gauge length part (2) is integral multiple of the powder spreading thickness;
the material components of the lower clamping end (1), the transition area (3), the gauge length part (2) and the upper clamping end (4) are the same or similar, so that reliable metallurgical connection between the lower clamping end (1) and the transition area (3) is realized under the action of laser.
2. Tensile specimen according to claim 1, characterized in that the radius of the circular arc (5) is 1mm-2 mm.
3. Tensile specimen according to claim 1, characterized in that the radii of the two tangent arcs of the curve (6) are both 0.5mm to 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565296.5A CN107389447B (en) | 2017-07-12 | 2017-07-12 | Tensile sample manufactured by metal additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565296.5A CN107389447B (en) | 2017-07-12 | 2017-07-12 | Tensile sample manufactured by metal additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107389447A CN107389447A (en) | 2017-11-24 |
| CN107389447B true CN107389447B (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710565296.5A Active CN107389447B (en) | 2017-07-12 | 2017-07-12 | Tensile sample manufactured by metal additive |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10365192B2 (en) | 2017-01-03 | 2019-07-30 | General Electric Company | Apparatus and method for rapid screening of material properties in a plurality of additively manufactured test specimens |
| US10571377B2 (en) * | 2018-07-10 | 2020-02-25 | Delavan Inc. | Torsion testing machine and methods for additive builds |
| CN108982181B (en) * | 2018-07-27 | 2020-03-20 | 西南交通大学 | Additive material high-throughput sample preparation method, characterization platform and characterization experiment method |
| CN110779799B (en) * | 2019-11-20 | 2022-08-19 | 青岛滨海学院 | Thermal management composite material tensile test sample and preparation method thereof |
| CN111451500A (en) * | 2020-04-02 | 2020-07-28 | 航发优材(镇江)增材制造有限公司 | Laser additive repair method for titanium alloy valve rod |
| CN114166588A (en) * | 2021-10-14 | 2022-03-11 | 浙江大学杭州国际科创中心 | Sample preparation method for in-situ tensile experiment of transmission electron microscope |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382998A (en) * | 2011-11-09 | 2012-03-21 | 北京有色金属研究总院 | Method for preparing in situ titanium-based composite material and part |
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2017
- 2017-07-12 CN CN201710565296.5A patent/CN107389447B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382998A (en) * | 2011-11-09 | 2012-03-21 | 北京有色金属研究总院 | Method for preparing in situ titanium-based composite material and part |
Non-Patent Citations (2)
| Title |
|---|
| INVESTIGATION OF TENSILE PROPERTIES OF BULK AND SLM FABRICATED 304L STAINLESS STEEL USING VARIOUS GAGE LENGTH SPECIMENS;S. Karnati et al.;《Solid Freeform Fabrication 2016: Proceedings of the 27th Annual International》;20161231;"Introduction"，"Experimental Setup"，"Results & Discussions" * |
| Residual stress via the contour method in compact tension specimens produced via selective laser melting;Bey Vrancken et al.;《Scripta Materialia》;20140607;第87卷;第29-32页 * |
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| CN107389447A (en) | 2017-11-24 |
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Effective date of registration: 20210929 Address after: Room 101, classic food industry innovation service complex, Youchegang Town, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee after: Zhejiang Yidong Technology Co.,Ltd. Address before: Southern University of Science and Technology Patentee before: SHENZHEN YIDONG AVIATION TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20230728 Address after: 046700 Mishan Industrial Park, Gaoping economic and Technological Development Zone, Gaoping City, Jincheng City, Shanxi Province Patentee after: Kangshuo (Shanxi) Low Stress Manufacturing System Technology Research Institute Co.,Ltd. Address before: Room 101, classic food industry innovation service complex, Youchegang Town, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee before: Zhejiang Yidong Technology Co.,Ltd. |
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