HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

High cycle fatigue behavior of 316L steel fabricated by laser powder bed fusion: effects of surface defect and loading mode

Abstract : The mechanical performances of additive manufactured (AM) material are highly dependent on the fabrication process which inevitably results in surface imperfection as well as porosity. In the present study, the high cycle fatigue (HCF) behavior of an AM stainless steel 316L is experimentally investigated to characterize and evaluate the effect of the inherent surface defects. Profilometry and Computed Tomography are used. A series of fatigue experiments is carried out under different loading modes including tension, bending, and torsion fatigue tests. For each loading condition, different surface preparations are used to investigate the effect of surface state. Fatigue tests reveal that surface treatment can improve fatigue performances, the improvements observed being higher under tension/bending loading than under torsion loading. The fractographic analysis is performed for all the available tested specimens to reveal the mechanism of fatigue crack initiation. Lack-of-fusion (LoF) defects play the predominant role in the fatigue performance of SS 316L fabricated by laser powder bed fusion (LPBF). The presence of multiple LoF defects at the surface or subsurface is detrimental to the endurance under cyclic loading. By using Murakami approach modeling the relationship between fatigue strength and defect size, it is found that the multiple clustering defects act synergistically as one large virtual crack to initiate the fatigue crack.
Complete list of metadata

https://hal-mines-albi.archives-ouvertes.fr/hal-03605934
Contributor : Imt Mines Albi Imt Mines Albi Connect in order to contact the contributor
Submitted on : Monday, May 9, 2022 - 4:04:10 PM
Last modification on : Monday, May 16, 2022 - 1:51:09 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2022-09-08

Please log in to resquest access to the document

Identifiers

Citation

Xiaoyu Liang, Anis Hor, Camille Robert, Mehdi Salem, Feng Lin, et al.. High cycle fatigue behavior of 316L steel fabricated by laser powder bed fusion: effects of surface defect and loading mode. International Journal of Fatigue, Elsevier, 2022, 160, pp.106843. ⟨10.1016/j.ijfatigue.2022.106843⟩. ⟨hal-03605934⟩

Share

Metrics

Record views

0