Very High Cycle Fatigue Behavior of Additively Manufactured 316L Stainless Steel

The present paper is focused on an experimental study of the damage-to-failure mechanism of additively manufactured 316L stainless steel specimens subjected to very high cycle fatigue (VHCF) loading. Ultrasonic axial tension-compression tests were carried out on specimens for up to 10 cycles, and fr...

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Bibliographic Details
Published in:Materials 2020-07, Vol.13 (15), p.3293
Main Authors: Voloskov, Boris, Evlashin, Stanislav, Dagesyan, Sarkis, Abaimov, Sergey, Akhatov, Iskander, Sergeichev, Ivan
Format: Article
Language:English
Subjects:
Additive manufacturing
Austenitic stainless steels
Axial stress
Compression tests
Crack initiation
Crack propagation
Damage
Defects
Failure mechanisms
Fatigue tests
Fracture mechanics
Fracture surfaces
High cycle fatigue
Lasers
Metal fatigue
Nonmetallic inclusions
Propagation
Stainless steel
Stress
Surface analysis (chemical)
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Summary:The present paper is focused on an experimental study of the damage-to-failure mechanism of additively manufactured 316L stainless steel specimens subjected to very high cycle fatigue (VHCF) loading. Ultrasonic axial tension-compression tests were carried out on specimens for up to 10 cycles, and fracture surface analysis was performed. A fine granular area (FGA) surrounding internal defects was observed and formed a "fish-eye" fracture type. Nonmetallic inclusions and the lack of fusion within the fracture surfaces that were observed with SEM were assumed to be sources of damage initiation and growth of the FGAs. The characteristic diameter of the FGAs was ≈500 μm on the fracture surface and were induced by nonmetallic inclusions; this characteristic diameter was the same as that for the fracture surface induced by a lack of fusion. Fracture surfaces corresponding to the high cycle fatigue (HCF) regime were discussed as well to emphasize damage features related to the VHCF regime.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13153293