CN113959829B - Evaluation method for performance influence of internal defects on additive manufactured parts - Google Patents
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- 230000007547 defect Effects 0.000 title claims abstract description 190
- 239000000654 additive Substances 0.000 title claims abstract description 66
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- 238000011156 evaluation Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000002950 deficient Effects 0.000 claims description 70
- 238000009864 tensile test Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 19
- 238000009659 non-destructive testing Methods 0.000 claims description 17
- 238000003754 machining Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 238000012935 Averaging Methods 0.000 claims description 12
- 238000011960 computer-aided design Methods 0.000 claims description 12
- 238000004381 surface treatment Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 3
- 238000010892 electric spark Methods 0.000 claims description 3
- 238000005459 micromachining Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for evaluating the influence of internal defects on the performance of additive manufactured parts, which comprises the following steps: establishing a mechanical influence coefficient of the defect size, a mechanical influence coefficient of the defect shape, a mechanical influence coefficient of the defect position and comprehensive evaluation of the influence of the defect on the mechanical property; according to the invention, the size, the position and the shape of the internal defects of the part are detected by constructing a nondestructive detection method, the size-to-performance influence coefficient, the position-to-performance influence coefficient, the shape-to-influence coefficient and the comprehensive influence coefficient are established, so that the size, the shape and the position-to-mechanical property influence rule of the internal defects of the additive manufacturing part are qualitatively and quantitatively evaluated, and in practical application, the mechanical property of the part can be evaluated under the condition that the part is not damaged only by nondestructive detection of the size, the position and the shape of the internal defects of the part, the evaluation cost is reduced to a certain extent, and the evaluation efficiency and the accuracy of the evaluation result are improved.
Description
Technical Field
The invention relates to the technical field of evaluation of mechanical properties of additive manufactured parts, in particular to an evaluation method of the influence of internal defects on the properties of additive manufactured parts.
Background
The additive manufacturing technology originates from the 60 th century, combines computer technology and material science, forms parts by applying the ideas of dispersion and accumulation, has good effects on the processing of materials with complex structure and difficult processing and thin-wall parts, has the advantages of short processing period, no mould, high material utilization rate and the like, has good tree construction in various materials, such as titanium alloy, high-temperature alloy, iron-based alloy, aluminum alloy, ceramic and the like, and is a novel integrated manufacturing technology combining laser cladding technology and rapid prototyping technology.
Compared with the traditional cast and forged piece, the structural piece manufactured by laser material increase has the advantages that the internal structure and the mechanical property are changed, meanwhile, the defect forms are quite different, so that the cast and forged piece detection data cannot be directly used, only the parts are subjected to nondestructive detection in the prior art, the size, the position and the shape of the internal defects of the parts are detected, whether the parts are qualified or not is judged according to the national standard and the industry standard, and the mechanical property detection of the parts is only subjected to destructive test, namely, the same manufacturing process, the same material and the same equipment are used for manufacturing a test bar with the mechanical property, the test bar is subjected to destructive mechanical property test, and the test value indirectly represents the mechanical property of the parts, so that the invention provides an evaluation method for the influence of the internal defects on the performance of the material increase manufactured parts, and the problems in the prior art are solved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for evaluating the influence of internal defects on the performance of an additive manufactured part, wherein the method detects the size, position and shape of the internal defects of the part by constructing a nondestructive detection method, establishes a size-to-performance influence coefficient, a position-to-performance influence coefficient, a shape-to-effect coefficient and a comprehensive influence coefficient, and evaluates the rule of the size, shape and position-to-mechanical property influence of the internal defects of the additive manufactured part qualitatively and quantitatively.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a method of evaluating the effect of an internal defect on the performance of an additively manufactured part, comprising the steps of:
step one: establishing the influence coefficient of defect size on mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and R with different sizes is manufactured in the manufacturing process y Three groups of parts are manufactured by additive of each group of defects, a group of parts without defects is manufactured by additive, the surface treatment is carried out on the defective parts and the parts without defects after the manufacturing is finished so as to meet the nondestructive testing requirement, then each group of parts is subjected to nondestructive testing, and the average value R of the defect size is obtained by average calculation of the detection value j R is taken as j And R is R y Comparing to obtain the ratio of the detected size to the true size of the defectThen a defect size influence function f is established c (R j I), then processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw Establishing the influence coefficient of defect size on mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step two: establishing the influence coefficient of the defect shape on the mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and different shapes X are manufactured in the manufacturing process y And additive manufacturing of three sets of parts per set of defects, establishing a defect shape impact factor f x Then adding material to make a group of non-defective parts, after the defective parts and non-defective parts are made, making surface treatment so as to attain the requirements for nondestructive detection, then making nondestructive detection on every group of parts so as to obtain the form Z j Then processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step three: establishing the influence coefficient of the defect position on the mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and different positions W are manufactured in the manufacturing process y Three groups of parts are manufactured by additive of each group of defects, a group of parts without defects is manufactured by additive, the surface treatment is carried out on the parts with defects and the parts without defects after the manufacturing is finished so as to meet the nondestructive testing requirement, then each group of parts is subjected to nondestructive testing, and the average value of the detection values is calculated to obtain the average value W of the positions of the defects j Establishing a defect position influence factor f w Then processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step four: comprehensive evaluation of the influence of defects on mechanical properties
Comprehensively considering the size, shape and position of the defects to obtain the mechanical property of the additive manufactured part, wherein L=Lgb×k×m×n, namely, the mechanical property value of the part is quantitatively calculated by the standard value of the mechanical property of the part and the size, shape and position of the defects are detected in a nondestructive mode.
The further improvement is that: in the second step, the defect shape influence factor f x 1,0.9,0.9,0.8, 1 when the defect shape is spherical, 0.9 when rectangular, and 0.8 when triangular.
The further improvement is that: in the third step, a defect position influence factor f w 1,0.9,0.8 when the defect is 1 in the part core, 0.8 when the defect is within 1mm of the part surface and the rest 0.9.
The further improvement is that: for different sizes R y Defects of different shapes X y Defects of (a) and different positions W y Is prefabricated by a mechanical processing method or is directly manufactured in an additive way inside the part by an additive manufacturing method.
The further improvement is that: the machining method comprises drilling, milling, electric spark machining and laser micro machining, and when defects are manufactured by adopting an additive manufacturing method, CAD (computer aided design) digital models of parts are designed according to evaluation requirements, defect holes are reserved in the CAD digital models, and the CAD digital models of the reserved defect holes are led into additive manufacturing equipment for manufacturing.
The further improvement is that: the nondestructive test adopts an ultrasonic or X-ray mode, and the tensile test bar is processed by a mechanical processing mode.
The further improvement is that: the different shape X y Defects of (a) include spherical defects, triangular defects, rectangular defects or rectangular defects, said different positions W y Defects include part bottom defects, part middle defects, part top defects, part surface defects, part subsurface defects, or part core defects.
The beneficial effects of the invention are as follows: according to the invention, the size, the position and the shape of the internal defects of the part are detected by constructing a nondestructive detection method, the size-to-performance influence coefficient, the position-to-performance influence coefficient, the shape-to-influence coefficient and the comprehensive influence coefficient are established, so that the size, the shape and the position-to-mechanical property influence rule of the internal defects of the additive manufacturing part are qualitatively and quantitatively evaluated, and in practical application, the mechanical property of the part can be evaluated under the condition that the part is not damaged only by nondestructive detection of the size, the position and the shape of the internal defects of the part, the evaluation cost is reduced to a certain extent, and the evaluation efficiency and the accuracy of the evaluation result are improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of a machining process for manufacturing defects according to a first embodiment of the present invention;
FIG. 3 is a flow chart of a manufacturing defect by additive manufacturing method according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1 and 2, the embodiment provides a method for evaluating the performance influence of an internal defect on an additive manufactured part, which includes the following steps:
step one: establishing the influence coefficient of defect size on mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and manufacturing different sizes R by adopting a machining method in the manufacturing process y Spherical defects with diameters of 0.1mm, 0.2mm, 0.3mm, 0.4mm … … 1.0.0 mm, 1.1mm … … 1.9.9 mm and 2.0mm, and three groups of parts are manufactured by additive material of each group of defects, a group of parts without defects are manufactured by additive material, the defective parts and the parts without defects are subjected to surface treatment after being manufactured so as to meet the requirements of nondestructive testing, then each group of parts is subjected to nondestructive testing by adopting ultrasonic waves, and the detection values are calculated averagely to obtain the average value R of the defect size j In case of known defect size, R is determined j And R is R y Comparing to obtain the ratio of the detected size to the true size of the defectThen a defect size influence function f is established c (R j I), machining the defective part and the non-defective part into tensile test bars, performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw According to the tensile property comparison of the defective part and the non-defective part, establishing the influence coefficient of the defect size on the mechanical property +.>
Step two: establishing the influence coefficient of the defect shape on the mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and manufacturing different shapes X by adopting a machining method in the manufacturing process y Defects such as spherical defects, triangles, rectangles, and lengthsSquare, and additive manufacturing of three groups of parts for each group of defects, establishing a defect shape influence factor f x 1,0.9,0.9,0.8 when the defect shape is spherical, 1 is taken, 0.9 is taken when the defect shape is rectangular, 0.8 is taken when the defect shape is triangular, a group of non-defective parts are manufactured by additive, the surface treatment is carried out after the defective parts and the non-defective parts are manufactured, so as to meet the nondestructive testing requirement, and then each group of parts is subjected to nondestructive testing by adopting ultrasonic to obtain the shape Z j Then machining the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step three: establishing the influence coefficient of the defect position on the mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and manufacturing different positions W by adopting a machining method in the manufacturing process y Defects such as bottom defects, middle defects, upper defects, surface defects, subsurface defects or core defects of the part, and each group of defects is additively manufactured into three groups of parts, then a group of non-defective parts is additively manufactured, the defective parts and the non-defective parts are subjected to surface treatment after being manufactured so as to meet the requirements of nondestructive testing, then each group of parts is subjected to nondestructive testing by adopting ultrasonic waves, and the detection values are averaged to obtain the average value W of the defect positions j Establishing a defect position influence factor f w 1,0.9,0.8 when the defect is 1 in the core of the part, 0.8 in the surface of the part and within 1mm from the part, and 0.9 in the rest, machining the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging the test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step four: comprehensive evaluation of the influence of defects on mechanical properties
Comprehensively considering the size, shape and position of the defects to obtain the mechanical property of the additive manufactured part, wherein L=Lgb×k×m×n, namely, the mechanical property value of the part is quantitatively calculated by the standard value of the mechanical property of the part and the size, shape and position of the defects are detected in a nondestructive mode.
The machining method comprises drilling, milling, electric spark machining and laser micro machining.
Example two
Referring to fig. 1 and 3, the embodiment provides a method for evaluating the performance influence of an internal defect on an additive manufactured part, which includes the following steps:
step one: establishing the influence coefficient of defect size on mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and directly manufacturing different sizes R in the parts in an additive mode in the manufacturing process y Spherical defects with diameters of 0.1mm, 0.2mm, 0.3mm, 0.4mm … … 1.0.0 mm, 1.1mm … … 1.9.9 mm, 2.0mm, and three sets of parts are manufactured by additive material for each set of defects, a set of parts without defects is manufactured by additive material, the defective parts and the parts without defects are subjected to surface treatment after being manufactured so as to meet the requirements of nondestructive inspection, then each set of parts is subjected to nondestructive inspection by X-ray, and the inspection values are averaged to obtain the average value R of the defect size j In case of known defect size, R is determined j And R is R y Comparing to obtain the ratio of the detected size to the true size of the defectThen a defect size influence function f is established c (R j I), machining the defective part and the non-defective part into tensile test bars, performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw According to the tensile property comparison of the defective part and the non-defective part, establishing the influence coefficient of the defect size on the mechanical property +.>
Step two: establishing the influence coefficient of the defect shape on the mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and directly manufacturing different shapes X in the parts in an additive mode in the manufacturing process y Defects such as spherical defects, triangles, rectangles, and additive manufacturing of three sets of parts per set of defects, establishing a defect shape influence factor f x 1,0.9,0.9,0.8 when the defect shape is spherical, 1 is taken, 0.9 is taken when the defect shape is rectangular, 0.8 is taken when the defect shape is triangular, a group of non-defective parts are manufactured by additive, the surface treatment is carried out after the defective parts and the non-defective parts are manufactured, so as to meet the nondestructive testing requirement, and then each group of parts is subjected to nondestructive testing by adopting X rays, so that the shape Z is obtained j Then machining the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step three: establishing the influence coefficient of the defect position on the mechanical property
Firstly, manufacturing parts with specified height in an additive mode according to detection requirements, and directly manufacturing different positions W in the parts in an additive mode in the manufacturing process y Defects such as bottom defects, middle defects, upper defects, surface defects, subsurface defects or core defects of the part, and each group of defects is additively manufactured into three groups of parts, and then a group of non-defective parts is additively manufactured, and the defective parts and the non-defective parts are subjected to surface treatment after being manufactured so as to meet the requirements of nondestructive inspection, and then X-ray is adoptedCarrying out nondestructive testing on each group of parts by using a wire, and carrying out average calculation on the detection values to obtain a defect position average value W j Establishing a defect position influence factor f w 1,0.9,0.8 when the defect is 1 in the core of the part, 0.8 in the surface of the part and within 1mm from the part, and 0.9 in the rest, machining the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging the test results to obtain an average value L pqx And L pw Establishing the influence coefficient of the defect shape on the mechanical property according to the tensile property comparison of the defective part and the non-defective part
Step four: comprehensive evaluation of the influence of defects on mechanical properties
Comprehensively considering the size, shape and position of the defects to obtain the mechanical property of the additive manufactured part, wherein L=Lgb×k×m×n, namely, the mechanical property value of the part is quantitatively calculated by the standard value of the mechanical property of the part and the size, shape and position of the defects are detected in a nondestructive mode.
When defects are manufactured by adopting the additive manufacturing method, CAD (computer aided design) digital models of parts are designed according to evaluation requirements, then defect holes are reserved in the CAD digital models, and then the CAD digital models with the reserved defect holes are guided into additive manufacturing equipment for manufacturing.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A method for evaluating the influence of internal defects on the performance of an additive manufactured part is characterized by comprising the following steps: the method comprises the following steps:
step one: establishing the influence coefficient of defect size on mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and R with different sizes is manufactured in the manufacturing process y And each group of defectsThree groups of parts are manufactured by additive, a group of parts without defects is manufactured by additive, the surface treatment is carried out on the defective parts and the parts without defects after the manufacturing is finished so as to meet the nondestructive testing requirement, then each group of parts is subjected to nondestructive testing, and the average value of the detection values is calculated to obtain the average value R of the defect size j R is taken as j And R is R y Comparing to obtain the ratio i between the detected size and the true size of the defect:then a defect size influence function f is established c (R j I), processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw According to the tensile property comparison of the defective part and the non-defective part, establishing a mechanical influence coefficient k of the defect size:
step two: establishing the influence coefficient of the defect shape on the mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and different shapes X are manufactured in the manufacturing process y And additive manufacturing of three sets of parts per set of defects, establishing a defect shape impact factor f x Then adding material to make a group of non-defective parts, after the defective parts and non-defective parts are made, making surface treatment so as to attain the requirements for nondestructive detection, then making nondestructive detection on every group of parts so as to obtain the form Z j Then processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw According to the tensile property comparison of the defective part and the non-defective part, establishing a mechanical influence coefficient m of the defect shape:
step three: establishing the influence coefficient of the defect position on the mechanical property
Firstly, parts with specified heights are manufactured in an additive mode according to detection requirements, and different positions W are manufactured in the manufacturing process y Three groups of parts are manufactured by additive of each group of defects, a group of parts without defects is manufactured by additive, the surface treatment is carried out on the parts with defects and the parts without defects after the manufacturing is finished so as to meet the nondestructive testing requirement, then each group of parts is subjected to nondestructive testing, and the average value of the detection values is calculated to obtain the average value W of the positions of the defects j Establishing a defect position influence factor f w Then processing the defective part and the non-defective part into tensile test bars and performing tensile test, and respectively averaging test results to obtain an average value L pqx And L pw According to the tensile property comparison of the defective part and the non-defective part, establishing a mechanical influence coefficient n of the defect shape:
step four: comprehensive evaluation of the influence of defects on mechanical properties
Comprehensively considering the size, shape and position of the defects to obtain the mechanical property of the additive manufactured part, wherein L=Lgb×k×m×n, namely, the mechanical property value of the part is quantitatively calculated by the standard value of the mechanical property of the part and the size, shape and position of the defects are detected in a nondestructive mode.
2. A method of evaluating the effect of an internal defect on the performance of an additive manufactured part according to claim 1, wherein: in the second step, the defect shape influence factor f x 1,0.9,0.9,0.8, 1 when the defect shape is spherical, 0.9 when rectangular, and 0.8 when triangular.
3. A method of evaluating the effect of an internal defect on the performance of an additive manufactured part according to claim 1, wherein: in the third step, a defect position influence factor f w 1,0.9,0.8 when the defect takes 1 at the part core, when the defect0.8 is taken on the surface of the part and within 1mm from the part, and the rest is taken to be 0.9.
4. A method of evaluating the effect of an internal defect on the performance of an additive manufactured part according to claim 1, wherein: for different sizes R y Defects of different shapes X y Defects of (a) and different positions W y Is prefabricated by a mechanical processing method or is directly manufactured in an additive way inside the part by an additive manufacturing method.
5. The method of evaluating the performance impact of an internal defect on an additively manufactured part of claim 4, wherein: the machining method comprises drilling, milling, electric spark machining and laser micro machining, and when defects are manufactured by adopting an additive manufacturing method, CAD (computer aided design) digital models of parts are designed according to evaluation requirements, defect holes are reserved in the CAD digital models, and the CAD digital models of the reserved defect holes are led into additive manufacturing equipment for manufacturing.
6. A method of evaluating the effect of an internal defect on the performance of an additive manufactured part according to claim 1, wherein: the nondestructive test adopts an ultrasonic or X-ray mode, and the tensile test rod is processed by a mechanical processing mode.
7. A method of evaluating the effect of an internal defect on the performance of an additive manufactured part according to claim 1, wherein: the different shape X y Defects of (a) include spherical defects, triangular defects, rectangular defects or rectangular defects, said different positions W y Defects include part bottom defects, part middle defects, part top defects, part surface defects, part subsurface defects, or part core defects.
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| CN108982538A (en) * | 2018-07-12 | 2018-12-11 | 北京星航机电装备有限公司 | A kind of defect of metal material increasing material manufacturing product and metallographic structure detection method |
| CN111710377A (en) * | 2020-05-08 | 2020-09-25 | 上海交通大学 | Test bar design method and system for evaluating influence of loose defect on mechanical property |
| CN113182531A (en) * | 2021-03-31 | 2021-07-30 | 武汉大学 | Composite defect for metal additive manufacturing nondestructive testing and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982538A (en) * | 2018-07-12 | 2018-12-11 | 北京星航机电装备有限公司 | A kind of defect of metal material increasing material manufacturing product and metallographic structure detection method |
| CN111710377A (en) * | 2020-05-08 | 2020-09-25 | 上海交通大学 | Test bar design method and system for evaluating influence of loose defect on mechanical property |
| CN113182531A (en) * | 2021-03-31 | 2021-07-30 | 武汉大学 | Composite defect for metal additive manufacturing nondestructive testing and preparation method thereof |
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