CN110243674A - A kind of mechanical property lossless detection method of SLM shaped metal articles - Google Patents
A kind of mechanical property lossless detection method of SLM shaped metal articles Download PDFInfo
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- CN110243674A CN110243674A CN201910341117.9A CN201910341117A CN110243674A CN 110243674 A CN110243674 A CN 110243674A CN 201910341117 A CN201910341117 A CN 201910341117A CN 110243674 A CN110243674 A CN 110243674A
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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
- G01N3/02—Details
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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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- 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
- G01N3/40—Investigating hardness or rebound hardness
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Abstract
The present invention relates to a kind of mechanical property lossless detection method of SLM shaped metal articles, this method obtains metal product and the detection sample positioned at level where metal product periphery, Yi Fasheng defective locations simultaneously in SLM forming process.These detection samples can play the role of supporting molded part, effectively reduce workpiece deformation, improve Forming Quality and assess the mechanical property of metal product partly or wholly.These detection samples with actual product working condition as, each sample can its position of accurate response, the mechanical property at level inside metal product, testing result is accurately with a high credibility, detection process is intuitive.The detection method has significantly saved detection time and testing cost without destroying product.
Description
Technical field
The present invention relates to metal material processing and detection technique fields, and in particular to a kind of SLM obtained by molding metal product
Mechanical property lossless detection method.
Background technique
Selective laser melting (Selective Laser Melting, SLM) is a kind of special rapid shaping technique,
The technology using the layer-by-layer melted alloy powder of high-energy, highdensity laser beam selectivity, thus obtain conventional fabrication processes without
The molding complicated shape 3-dimensional metal product of method.SLM technology production product have been widely used for space flight, medical treatment, ship and
In automobile industry, mechanical performance quite even better than uses the molding similar product of Conventional processing methods, has good work
Industry application prospect.
The mechanical property of metal product be evaluate its can practical application an important indicator.Metal Mechanic Property is main
Depending on the factors the such as whether residual stress of material, phase composition and institutional framework uniform.SLM forming process is special, product
Mechanical property and the molding product of traditional handicraft have relatively big difference.SLM first is one, and successively superposition, metal powder melt completely
Molding process, forming temperature is high, scanning speed is fast, and maximum heating rate and rate of temperature fall can reach 3.75 × 105DEG C/s,
Maximum temperature gradient reaches 2000 DEG C.In this course, the thermal cycle of each layer melt-forming metal experience and molding environment are equal
Difference causes product internal stress larger and is unevenly distributed.Additionally due to the maximum temperature of product each point is different in forming process,
Different temperatures duration is also different, and the phase composition of product is caused to be unevenly distributed.Due to great temperature gradient and product
The influence of labyrinth, the defects of often will appear hole, micro-crack and cracking in the molding metal product of SLM, these defects
It is the key factor for causing its mechanical property bad.Therefore, using the molding metal product of SLM and using traditional approach preparation
Metal product mechanical property is entirely different.Currently, being generally destruction reality to the Mechanics Performance Testing of SLM shaped metal articles
It tests, still lacks a kind of inexpensive, easy-operating lossless detection method.
In addition to this, SLM molding equipment is expensive at present, and high-test metal dusty material price is also higher, general real
The formed product time of border application is longer, and the production status that supply falls short of demand is presented in certain enterprises.More importantly SLM product
Mostly based on customizing, output is generally limited pieces even single-piece, therefore traditional destruction test method forms SLM
Metal product and be not suitable for.Since each layer of the molding product of SLM, condition of molding everywhere are different, the incident position of defect
It sets also different, it is desirable to sufficiently assess its mechanical property, need to be tested the different location of different layers is separately sampled respectively, ability
Obtain comprehensive, objective mechanical property assessment result.
In conclusion inventor team is on the basis of seminar research achievement CN2019101342691 not long ago into one
Step further investigation successfully develops a kind of for the non-destructive testing of SLM obtained by molding metal product mechanical property, appraisal procedure.
Summary of the invention
It is an object of the invention to overcome existing detection technique above shortcomings, a kind of SLM forming metal production is provided
The mechanical property lossless detection method of product.This method can obtain several selected layer, spy while SLM shaped metal articles
The mechanics properties testing sample at place is set in positioning, and SLM metal product part is assessed and then the mechanical property for measuring these samples
Or whole mechanical property.These detection samples also have support effect in addition to detection acts on, and can significantly improve Forming Quality.
To achieve the above object, as follows to invent used technical solution:
A kind of mechanical property lossless detection method of SLM shaped metal articles, comprising the following steps: (a) designs SLM metal
When the three-dimensional structure of product, sample is detected in the selected layer periphery design of SLM metal product；(b) SLM is formed, while obtaining gold
Belong to product and detection sample；(c) to detection sample carry out Mechanics Performance Testing, according to test result evaluate metal product part and
Whole mechanical property.
Further, the selected layer includes that metal product plane and normal portions institute where rejected region easily occurs
Plane, it is described that easily rejected region occur include wide-angle corner regions, wide-angle variable cross-section area, tenuity, suspension area etc..
Further, metal product each easily there are several selected layer of rejected region spaced set, to obtain
Easily there is the detection sample of rejected region mechanical property in a series of can embody.
Further, each selected layer at least designs the detection sample of an identical or different shape.
Further, the detection specimen shape includes the associated test standards such as I-shaped (also known as dumbbell shape) and circular ring shape
Defined specimen shape.
Further, SLM obtained by molding metal product, detection sample need to be pre-processed, and the pretreatment includes at heat
Reason, shot-peening etc..
Further, the Mechanics Performance Testing includes tension test, compression test, mixcrohardness test etc..
Compared with prior art, the invention has the following advantages: (1) also obtains while SLM shaped metal articles
A series of detection samples are arrived, for these detection samples as the condition of molding of actual product, each sample can be accurate
The mechanical property of actual product, testing result accurate and effective, detection process are intuitive at reaction position, level；(2) it detected
Without destroying the molding metal product of SLM in journey, greatly shorten detection time, can more comprehensively and accurately detect and
Evaluate the mechanical property of SLM shaped metal articles；(3) detection specimen size is flexibly adjustable, significantly less than traditional means of experiment institute
It is required that specimen size, detection method is quick, evaluation index multiplicity, as a result more accurate and reliable；(4) detection sample simultaneously can be with
Play the role of support, effectively reduce the deformation of workpiece, improve heat transfer when work pieces process, finally improves workpiece matter
Amount.
Detailed description of the invention
Fig. 1 is the molding band large-scale metal product of SLM and detection sample chosen position schematic diagram in embodiment 1；
Fig. 2 is the detection sample material object photo that embodiment 1 obtains；
Fig. 3 is that the detection sample that embodiment 1 obtains completes the photo in kind after mechanical test；
Fig. 4 is the detection sample load-deformation curve that embodiment 1 obtains；
Fig. 5 is the tensile strength and elongation percentage result figure for the detection sample that embodiment 1 obtains.
Specific embodiment
To make those of ordinary skill in the art fully understand technical solution of the present invention and beneficial effect, below in conjunction with specific
Embodiment is further described.
Embodiment 1
As shown in Figure 1, the related data of detection sample is added when designing the SLM threedimensional model of metal product.In metal
Product normal portions are average along Z-direction (height or thickness direction), equidistantly choose several X-Y planes, and each plane is
One group, 3 samples of every group of setting.Plane where easily occurring the position of defect in metal product structure, if being chosen along Z-direction
Dry (such as 1-5) X-Y plane, each plane additionally increase by 1 group of corrosion-resistant detection sample other than 3 groups of aforementioned specimens are arranged.
After the SLM threedimensional model for designing metal product, SLM molding is carried out by raw material of metal powder, respectively obtains stainless steel product
(SLM metal product) and several detections sample (such as Fig. 2) have marked the corresponding Z axis numerical value of each group detection sample.
Detection sample obtained and stainless steel product are subjected to the pretreatment such as heat treatment and shot-peening after the same method, so
The test such as tension test (result is shown in Fig. 3-5), compression test, mixcrohardness test is carried out to sample afterwards, obtains detection sample
Mechanics Performance Testing report.Assessment SLM stainless steel product part and whole mechanical property are analyzed using this report.
By Fig. 4 and Fig. 5 it is found that the tensile strength of SLM molding detection sample is up to 1640.94MPa, elongation at break is
2.2%.The control sample of same size, material has been prepared with conventional casting methods using same metal material, has tested table
Its bright tensile strength is 1720MPa, and 0.2% yield strength is 1480MPa, elongation at break 8%.Comparison is it is found that SLM is detected
The more traditional single piece of forged metal of the tensile strength of sample low 4.6%, metalwork of the elongation percentage well below forging molding.This says
Bright, the mechanical property difference of detection test specimen obtained by two kinds of molding modes is larger, is suitable for metal product obtained by traditional forging method
Detection method and testing result can not be used to evaluate the molding metal product of SLM.
In order to further verify the correctness of this test method, with detection sample same layer metal product inside be cut into
The contrasting detection sample of same shape size, has carried out Mechanics Performance Testing, comparing result such as table 1-2 institute after the same method
Show.
Sample and metal inside sample tensile strength contrast table are detected in 1 embodiment 1 of table
Sample and metal inside sample fracture elongation contrast table are detected in 2 embodiment 1 of table
By table 1-2 it is found that the mechanical property of metal product and the mechanical property of detection sample are about the same, this illustrates the survey
Have a try sample really can mechanical property inside accurate response same layer metal product, also demonstrate that this method test method is just to truly have
Effect.
Claims (8)
1. a kind of mechanical property lossless detection method of SLM shaped metal articles, it is characterised in that the following steps are included:
(a) when designing the three-dimensional structure of SLM metal product, sample is detected in the selected layer periphery design of SLM metal product；
(b) SLM is formed, while obtaining metal product and detection sample；
(c) Mechanics Performance Testing is carried out to detection sample, metal product part and whole mechanical property is evaluated according to test result
Energy.
2. the method as described in claim 1, it is characterised in that: the selected layer includes that metal product rejected region institute easily occurs
Plane and normal portions where plane.
3. method according to claim 2, it is characterised in that: it is described easily occur rejected region include wide-angle corner regions, it is big
Angle variable cross-section area, tenuity, suspension area etc..
4. method as claimed in claim 2 or claim 3, it is characterised in that: metal product each easily rejected region occur equidistant
Several selected layer are set, so that obtaining a series of can embody the detection sample of rejected region mechanical property easily occurs.
5. the method as described in claim 1, it is characterised in that: each selected layer at least designs an identical or different shape
Detection sample.
6. the method as described in claim 1, it is characterised in that: the detection specimen shape include I-shaped, circular ring shape and its
Shape as defined in his testing standard.
7. the method as described in claim 1, it is characterised in that: SLM obtained by molding metal product, detection sample need to be located in advance
Reason, the pretreatment include heat treatment, shot-peening etc..
8. the method as described in claim 1, it is characterised in that: the Mechanics Performance Testing include tension test, compression test,
Mixcrohardness test etc..
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697586A (en) * | 2020-12-07 | 2021-04-23 | 中国科学院上海应用物理研究所 | Method for evaluating performance of complex deformation forming member after heat treatment |
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| CN107175329A (en) * | 2017-04-14 | 2017-09-19 | 华南理工大学 | A kind of 3D printing successively detects reverse part model and positioning defect apparatus and method |
| CN107206495A (en) * | 2015-01-29 | 2017-09-26 | 奥科宁克有限公司 | System and method for simulating addition manufacture body |
| CN107356479A (en) * | 2017-07-12 | 2017-11-17 | 南方科技大学 | Material during tensile method of evaluating performance based on selective laser melting process |
| CN207205270U (en) * | 2017-04-14 | 2018-04-10 | 华南理工大学 | A kind of 3D printing successively detects reverse part model and positioning defect device |
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| US7154660B2 (en) * | 2005-05-23 | 2006-12-26 | Texas Instruments Incorporated | Testing of spatial light modulators (SLM) |
| CN107206495A (en) * | 2015-01-29 | 2017-09-26 | 奥科宁克有限公司 | System and method for simulating addition manufacture body |
| CN107175329A (en) * | 2017-04-14 | 2017-09-19 | 华南理工大学 | A kind of 3D printing successively detects reverse part model and positioning defect apparatus and method |
| CN207205270U (en) * | 2017-04-14 | 2018-04-10 | 华南理工大学 | A kind of 3D printing successively detects reverse part model and positioning defect device |
| CN107121377A (en) * | 2017-04-28 | 2017-09-01 | 武汉理工大学 | Stainless steel corrosion resisting property detection method prepared by selective laser cladding |
| CN107356479A (en) * | 2017-07-12 | 2017-11-17 | 南方科技大学 | Material during tensile method of evaluating performance based on selective laser melting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112697586A (en) * | 2020-12-07 | 2021-04-23 | 中国科学院上海应用物理研究所 | Method for evaluating performance of complex deformation forming member after heat treatment |
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Application publication date: 20190917 |