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computed tomography
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Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006974
EISBN: 978-1-62708-439-0
... Abstract X-ray radiography and computed tomography (CT) are nondestructive testing (NDT) tools particularly well suited to additive manufacturing (AM). A brief overview of NDT for AM is presented in this article, including other NDT methods, followed by identifying the key advantages...
Abstract
X-ray radiography and computed tomography (CT) are nondestructive testing (NDT) tools particularly well suited to additive manufacturing (AM). A brief overview of NDT for AM is presented in this article, including other NDT methods, followed by identifying the key advantages and requirements for x-ray radiography and CT in AM. Less widely known applications of CT are also presented, including powder characterization, the evaluation of lattice structures, surface roughness measurements, and four-dimensional CT involving interrupted (before-after) CT scans of the same parts, or even in situ scans of the same part subjected to some processing or loading conditions. The article concludes with a discussion on the limits and some guidelines for the use of x-ray and CT for various AM materials.
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006456
EISBN: 978-1-62708-190-0
... Abstract Computed tomography (CT) is an imaging technique that generates a three-dimensional (3-D) volumetric image of a test piece. This article illustrates the basic principles of CT and provides information on the types, applications, and capabilities of CT systems. A comparison...
Abstract
Computed tomography (CT) is an imaging technique that generates a three-dimensional (3-D) volumetric image of a test piece. This article illustrates the basic principles of CT and provides information on the types, applications, and capabilities of CT systems. A comparison of performance characteristics for film radiography, real-time radiography, and X-ray computed tomography is presented in a table. A functional block diagram of a typical computed tomography system is provided. The article discusses CT scanning geometry that is used to acquire the necessary transmission data. It also provides information on digital radiography, image processing and analysis, dual-energy imaging, and partial angle imaging, of a CT system.
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in X-Ray—Radiography and Computed Tomography in Additive Manufacturing
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 11 Example of before-after computed tomography (four-dimensional computed tomography) that allows the evaluation of crack location and crack path relative to the original state of the material prior to testing, with blue indicating the broken (after) state
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Published: 01 December 1998
Fig. 9 Comparison of (a) computed tomography (CT) and (b) radiography. A high-quality digital radiograph (b) of a solid rocket motor igniter shows a serious flaw in a carefully oriented tangential shot. A CT image (a) at the height of the flaw shows the flaw in more detail and in a form
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Published: 30 August 2021
Fig. 18 (a) Computed tomography (CT) three-dimensional (3-D) surface render of scanned cutout containing the leak, with CT image plane indicated. OD, outer diameter; ID, inner diameter. (b) Image plane from CT at leak location. (c) Metallurgical cross section near leak location, with key weld
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Published: 30 August 2021
Fig. 19 (a) Computed tomography (CT) three-dimensional (3-D) surface render of scanned cutout containing the leak, with CT image plane indicated. (b) Image plane from CT at leak location. (c) Optical micrograph of cryofracture-opened weld near leak location, with key weld discontinuities
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in Nondestructive Testing in Additive Manufacturing—A Review
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 8 Scans show the inspection capability of the x-ray computed tomography method in two additively manufactured parts. (a) Hinge bracket crack and surface irregularities detection. (b) Ace cup rings of porous material in the middle section of thickness via laser powder-bed fusion using
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in Surface and Geometrical Characterization and Measurements in Additive Manufacturing
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 7 Typical laboratory-based x-ray computed tomography process flow, from data acquisition to measurement evaluation
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in X-Ray—Radiography and Computed Tomography in Additive Manufacturing
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 2 Schematic and resulting x-ray computed tomography (CT) scan of an additively manufactured bracket
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in X-Ray—Radiography and Computed Tomography in Additive Manufacturing
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 3 Computed tomography cross-sectional image (slice image) of the bracket in Fig. 1 , with pores visible as black dots just under the surface of the part. Inset shows the slice plane for this image in the three-dimensional dataset.
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in Application of Machine Learning to Monitor Metal Powder-Bed Fusion Additive Manufacturing Processes
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 8 Computed tomography (CT) anomaly cluster from a powder-bed fusion additive manufacturing build consisting of 669 individually identified voxels, with the cluster representing a physical defect in the part. (a) Three-dimensional plot. (b) XY , XZ , and YZ cross sections
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in Additive Manufacturing in the Oil and Gas Industry
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 16 Automated defect detection in computed-tomography-scanned parts. Courtesy of Baker Hughes
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in Aluminum Alloy Design for Additive Manufacturing
> Additive Manufacturing Design and Applications
Published: 30 June 2023
Fig. 16 Pore volume distribution for computed tomography scan performed on the representative oil filter ( Fig. 15 )
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in Visual Examination and Photography in Failure Analysis
> Characterization and Failure Analysis of Plastics
Published: 15 May 2022
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Published: 15 January 2021
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Published: 15 January 2021
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Published: 15 January 2021
Fig. 58 Model of swivel bracket reconstructed from computed tomography scan data. Isometric views
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Published: 15 January 2021
Fig. 59 Model of swivel bracket reconstructed from computed tomography scan data. (a) Front view. (b) Rear view
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Published: 15 January 2021
Fig. 60 Model of swivel bracket reconstructed from computed tomography scan data. (a) Top view. (b) Bottom view
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Published: 01 January 2001
Fig. 35 Comparison of radiography and computed tomography (a) Conventional projection radiography. (b) CT using slit collimation
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