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Fatigue of additively manufactured 316L stainless steel: The influence of porosity and surface roughness
Author(s) -
Solberg Klas,
Guan Shuai,
Razavi Nima,
Welo Torgeir,
Chan Kang Cheung,
Berto Filippo
Publication year - 2019
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13077
Subject(s) - materials science , fractography , surface roughness , porosity , fatigue testing , fracture (geology) , surface finish , composite material , intensity (physics) , fatigue limit , stress intensity factor , stress concentration , metallurgy , fracture mechanics , physics , quantum mechanics
The fatigue behaviour of additively manufactured (AM) 316L stainless steel is investigated with the main emphasis on internal porosity and surface roughness. A transition between two cases of failure are found: failure from defects in the surface region and failure from the internal defects. At low applied load level (and consequently a high number of cycles to failure), fatigue is initiating from defects in the surface region, while for high load levels, fatigue is initiating from internal defects. Porosities captured by X‐ray computed tomography (XCT) are compared with the defects initiating fatigue cracks, obtained from fractography. The fatigue data are synthesised using stress intensity factor (SIF) of the internal and surface defects on the fracture surface.