TY - JOUR
T1 - Effects of process atmosphere on additively manufactured FeCrAl oxide dispersion strengthened steel
T2 - Printability, microstructure and tensile properties
AU - Wang, Yanan
AU - Wang, Binbin
AU - Luo, Liangshun
AU - Oliveira, J. P.
AU - Li, Binqiang
AU - Yan, Hui
AU - Liu, Tong
AU - Zhao, Junhao
AU - Wang, Liang
AU - Su, Yanqing
AU - Guo, Jingjie
AU - Chen, Dayong
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/8/24
Y1 - 2023/8/24
N2 - In this study, the effects of using a reactive process atmosphere (premixed Ar–O2 mixture and N2) on additively manufactured FeCrAl oxide dispersion strengthened (ODS) steel are evaluated by investigating the oxygen/nitrogen content of the as-built material, geometric characteristics and stability of the molten pool, microstructural feature, second phase formation and tensile properties. It was found that the use of reactive process gas within the building chamber allowed for in-situ alloying in the molten pool. With increasing oxygen content in the building chamber, more oxygen was dissolved by the molten pool allowing for more oxide formation. However, oxide agglomeration and coarsening were also seen to occur. When printing under the N2 process atmosphere, the nitrogen content in the as-built material increased, and the oxide agglomeration and coarsening were alleviated. A smaller depth-to-width ratio of the molten pool and a more uniform low-angle grain boundaries (LAGBs) distribution in the as-built material were realized when printing under Ar-1% O2 or N2 process atmosphere. Nitrogen, as low-cost gas, can be considered to replace traditional Ar as shielding gas for improved mechanical properties of as-built parts.
AB - In this study, the effects of using a reactive process atmosphere (premixed Ar–O2 mixture and N2) on additively manufactured FeCrAl oxide dispersion strengthened (ODS) steel are evaluated by investigating the oxygen/nitrogen content of the as-built material, geometric characteristics and stability of the molten pool, microstructural feature, second phase formation and tensile properties. It was found that the use of reactive process gas within the building chamber allowed for in-situ alloying in the molten pool. With increasing oxygen content in the building chamber, more oxygen was dissolved by the molten pool allowing for more oxide formation. However, oxide agglomeration and coarsening were also seen to occur. When printing under the N2 process atmosphere, the nitrogen content in the as-built material increased, and the oxide agglomeration and coarsening were alleviated. A smaller depth-to-width ratio of the molten pool and a more uniform low-angle grain boundaries (LAGBs) distribution in the as-built material were realized when printing under Ar-1% O2 or N2 process atmosphere. Nitrogen, as low-cost gas, can be considered to replace traditional Ar as shielding gas for improved mechanical properties of as-built parts.
KW - LB-PBF
KW - ODS steel
KW - Printability
KW - Reactive process atmosphere
KW - Tensile properties
UR - http://www.scopus.com/inward/record.url?scp=85165531757&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2023.145438
DO - 10.1016/j.msea.2023.145438
M3 - Article
AN - SCOPUS:85165531757
SN - 0921-5093
VL - 882
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 145438
ER -