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Fatigue strength of PBF-LB/M and wrought 316L stainless steel: effect of post treatment and cyclic mean stress
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  • Moritz Braun,
  • Eduard Mayer,
  • Igor Kryukov,
  • Christian Wolf,
  • Stefan Böhm,
  • Aliakbar Taghipour,
  • Rachael Wu,
  • Sören Ehlers,
  • Shahram Sheikhi
Moritz Braun
Hamburg University of Technology
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Eduard Mayer
University of Applied Science Hamburg
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Igor Kryukov
University of Kassel
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Christian Wolf
University of Kassel
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Stefan Böhm
University of Kassel
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Aliakbar Taghipour
Isfahan University of Technology
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Rachael Wu
Hamburg University of Technology
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Sören Ehlers
Hamburg University of Technology
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Shahram Sheikhi
University of Applied Science Hamburg
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Abstract

Additive manufacturing (AM) enables the cost-effective production of complex components, many of which are traditionally manufactured using costly production steps among other processes. One widely applied AM process is Laser-based Powder Bed Fusion of Metals (PBF-LB/M); however, internal pores and rough surfaces are typically inevitable with PBF-LB/M, reducing fatigue and corrosion resistance compared to traditional processes involving turning and milling. Additionally, large defects often occur near to or just at the surfaces. Thus, this study investigates the effect of hybrid additive and subtractive manufacturing on the fatigue strength of AISI 316L. For this purpose, different post treatment routes are compared with wrought material. Additionally, computer tomography is used to determine the necessary machining depth of the surface layer. In this study, heat-treatment and machining are both found to significantly increase fatigue strength. Finally, cyclic mean stresses affect wrought and AM specimens differently.

Peer review status:UNDER REVIEW

24 May 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
26 May 2021Assigned to Editor
26 May 2021Submission Checks Completed
28 May 2021Reviewer(s) Assigned