TY - JOUR
T1 - Plasticity and fracture behavior of Inconel 625 manufactured by laser powder bed fusion
T2 - Comparison between as-built and stress relieved conditions
AU - Qin, Shipin
AU - Novak, Theresa C.
AU - Vailhe, Madeline K.
AU - Liu, Zi Kui
AU - Beese, Allison M.
N1 - Funding Information:
This work was financially supported by the U.S. Department of Energy via award no. DE-FE0031553 and the Office of Naval Research via contract no. N00014-17-1-2567 . The powder referred to as Carpenter powder was donated by Carpenter Technology, which is greatly appreciated by the authors.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3/4
Y1 - 2021/3/4
N2 - In this study, the influence of stress relief on the plasticity and fracture behavior of Inconel 625 fabricated through laser powder bed fusion additive manufacturing (AM) was investigated. The as-built versus stress relieved microstructures were compared, showing similar grain structures but the presence of ~10 vol % δ phase in the stress relieved condition, and no δ phase in the as-built condition. Mechanical tests under plane strain tension were performed on the stress relieved samples, and an anisotropic plasticity model was calibrated and validated using finite element simulations. Uniaxial and notched tension tests were performed on both as-built and stress relieved samples to probe the effect of stress relief on stress state- and direction-dependent fracture behavior. It was found that on average, the fracture strain of the stress relieved samples along the build direction was 30% higher than that along the perpendicular build direction in the stress state range studied, and the stress relief heat treatment resulted in a 45% decrease in fracture strain. The fracture strain in stress relieved samples was more strongly dependent on stress state than in as-built samples.
AB - In this study, the influence of stress relief on the plasticity and fracture behavior of Inconel 625 fabricated through laser powder bed fusion additive manufacturing (AM) was investigated. The as-built versus stress relieved microstructures were compared, showing similar grain structures but the presence of ~10 vol % δ phase in the stress relieved condition, and no δ phase in the as-built condition. Mechanical tests under plane strain tension were performed on the stress relieved samples, and an anisotropic plasticity model was calibrated and validated using finite element simulations. Uniaxial and notched tension tests were performed on both as-built and stress relieved samples to probe the effect of stress relief on stress state- and direction-dependent fracture behavior. It was found that on average, the fracture strain of the stress relieved samples along the build direction was 30% higher than that along the perpendicular build direction in the stress state range studied, and the stress relief heat treatment resulted in a 45% decrease in fracture strain. The fracture strain in stress relieved samples was more strongly dependent on stress state than in as-built samples.
UR - http://www.scopus.com/inward/record.url?scp=85100388708&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85100388708&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.140808
DO - 10.1016/j.msea.2021.140808
M3 - Article
AN - SCOPUS:85100388708
SN - 0921-5093
VL - 806
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 140808
ER -