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Crack characterization of fatigued additively manufactured Ti-6Al-4V using X-ray computed tomography and deep learning methods
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  • Bardia Hejazi,
  • Amaya Compart,
  • Tobias Fritsch,
  • Ruben Wagner,
  • Anja Weidner,
  • Horst Biermann,
  • Christopher Benz,
  • Manuela Sander,
  • Giovanni Bruno
Bardia Hejazi
Bundesanstalt fur Materialforschung und -prufung

Corresponding Author:[email protected]

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Amaya Compart
Technische Universität Bergakademie Freiberg
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Tobias Fritsch
Bundesanstalt fur Materialforschung und -prufung
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Ruben Wagner
Technische Universität Bergakademie Freiberg
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Anja Weidner
Technische Universität Bergakademie Freiberg
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Horst Biermann
Technische Universität Bergakademie Freiberg
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Christopher Benz
Universitat Rostock
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Manuela Sander
Universitat Rostock
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Giovanni Bruno
Bundesanstalt fur Materialforschung und -prufung
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Abstract

X-ray computed tomography is an extremely useful tool for the non-destructive analysis of additively manufactured (AM) components. AM components often show manufacturing defects such as high porosity, rough surfaces, or a lack of fusion (LoF) between production layers. These imperfections can be detrimental for the fatigue life of components. To better understand how cracks initiate and grow from internal defects, we fabricated Ti-6Al-4V samples with an internal cavity using electron beam powder bed fusion (PBF-EB/M). The samples were tested in the high-cycle fatigue (HCF) and very high-cycle fatigue (VHCF) regime using ultrasonic testing equipment and analyzed with X-ray computed tomography (XCT). X-ray imaging was used to locate crack initiation sites around defects and to measure characteristic properties of the crack and the defects with the aid of deep learning segmentation tools. LoF defects exposed to the outer surface of the samples due to machining and post-processing, were found to be as detrimental to the fatigue life as the printed central artificial defects. The work presented here can benefit industries that utilize the AM of high-strength, light-weight alloys, such as aerospace and medicine, in the design and manufacturing of components by improving part reliability and fatigue life.
Submitted to Fatigue & Fracture of Engineering Materials & Structures
Submission Checks Completed
Assigned to Editor
Reviewer(s) Assigned
09 Aug 2024Review(s) Completed, Editorial Evaluation Pending
15 Aug 2024Editorial Decision: Revise Major
18 Sep 20241st Revision Received
20 Sep 2024Submission Checks Completed
20 Sep 2024Assigned to Editor
29 Sep 2024Reviewer(s) Assigned
07 Oct 2024Review(s) Completed, Editorial Evaluation Pending
10 Oct 2024Editorial Decision: Accept