Fatigue strength of PBF-LB/M and wrought 316L stainless steel : effect of post-treatment and cyclic mean stress
Citation Link: https://doi.org/10.15480/882.3852
Publikationstyp
Journal Article
Date Issued
2021-08-03
Sprache
English
TORE-DOI
Volume
44
Issue
11
Start Page
3077
End Page
3093
Citation
Fatigue and Fracture of Engineering Materials and Structures 44 (11): 3077-3093 (2021)
Publisher DOI
Scopus ID
Publisher
Wiley-Blackwell
Additive manufacturing (AM) enables the cost-effective production of complex components, many of which are traditionally manufactured using costly subtractive processes. During laser-based powder bed fusion of metals (PBF-LB/M), internal pores and rough surfaces are typically inevitable, reducing fatigue and corrosion resistance compared to traditional processes. Additionally, large defects often occur near to or at surfaces. Thus, this study investigates the effect of hybrid additive and subtractive manufacturing on the fatigue strength of AISI 316L. To this goal, different post-treatment routes are compared with wrought material. Additionally, computed 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 (17% and 87%). Finally, the mean stress sensitivity M of as-built PBF-LB/M and wrought material is found to be highly affected by the assessed number of cycles to failure and residual stresses in PBF-LB/M material.
Subjects
additive materials
heat treatment
mean stress effects
selective laser melting
surface roughness
surface treatment
DDC Class
500: Naturwissenschaften
530: Physik
540: Chemie
600: Technik
620: Ingenieurwissenschaften
Publication version
acceptedVersion