TY - JOUR
T1 - Combined effects of porosity and stress state on the failure behavior of laser powder bed fusion stainless steel 316L
AU - Wilson-Heid, Alexander E.
AU - Beese, Allison M.
N1 - Funding Information:
The financial support provided by the National Science Foundation through award number CMMI-1652575 is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors also express their gratitude to the staff of the Center for Quantitative Imaging (CQI) at Penn State for their help with X-ray CT work.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3
Y1 - 2021/3
N2 - Two primary variables that impact failure behavior of ductile metals are defects and stress state. These factors are especially critical in additively manufactured materials, as components made by additive manufacturing (AM) can have complex shapes that result in the material being subjected to multiaxial stresses under load, and these materials may also contain internal porosity due to AM processing. This study experimentally investigates the effects of both internal pores and stress state on the ductile failure behavior of laser powder bed fusion additively manufactured 316L stainless steel through the introduction of intentional penny-shaped pores of varying size at the center of samples whose geometries result in different stress states. It was found that strain to failure depended strongly on stress triaxiality until a large pore size with a diameter of 1200 µm (4% cross-sectional area of the sample gauge sections), while strain to failure was independent of stress triaxiality, and only a function of pore diameter, with larger pores (9% cross-sectional area or larger).
AB - Two primary variables that impact failure behavior of ductile metals are defects and stress state. These factors are especially critical in additively manufactured materials, as components made by additive manufacturing (AM) can have complex shapes that result in the material being subjected to multiaxial stresses under load, and these materials may also contain internal porosity due to AM processing. This study experimentally investigates the effects of both internal pores and stress state on the ductile failure behavior of laser powder bed fusion additively manufactured 316L stainless steel through the introduction of intentional penny-shaped pores of varying size at the center of samples whose geometries result in different stress states. It was found that strain to failure depended strongly on stress triaxiality until a large pore size with a diameter of 1200 µm (4% cross-sectional area of the sample gauge sections), while strain to failure was independent of stress triaxiality, and only a function of pore diameter, with larger pores (9% cross-sectional area or larger).
UR - http://www.scopus.com/inward/record.url?scp=85099792393&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85099792393&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2021.101862
DO - 10.1016/j.addma.2021.101862
M3 - Article
AN - SCOPUS:85099792393
SN - 2214-8604
VL - 39
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 101862
ER -