TY - GEN
T1 - Control of the Microstructure and Mechanical Properties of a Super Duplex SAF 2507 Steel Produced by Additive Manufacturing
AU - Piras, Maxime
AU - Hor, Anis
AU - Charkaluk, Eric
N1 - Publisher Copyright:
© 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - Two-phase duplex stainless steels are widely used in transport industry due to their good fatigue and corrosion properties. Although these steels are investigated when they are produced and/or shaped by conventional processes, few research works have characterized duplex steels obtained by additive processes. This paper concerns the elaboration and characterization of super duplex steel SAF 2507 obtained by laser powder bed fusion (LPBF). Firstly, the printability of this steel is discussed by analyzing the impact of certain process parameters on the density and microstructure of the material. This as-built microstructure being ferritic and not very ductile, various heat treatments (HT) are, then, applied in order to obtain the typical two-phase microstructure and thus improve the ductility. Afterward, the impact of the different phases (austenite and ferrite) on its mechanical behavior is analyzed. This work has shown the possibility of obtaining an austenitic-ferritic microstructure close to 50–50 with different grain morphologies with an appropriate post-fabrication TTH. The resulting mechanical properties are satisfactory compared to those of duplex steel obtained by conventional processes.
AB - Two-phase duplex stainless steels are widely used in transport industry due to their good fatigue and corrosion properties. Although these steels are investigated when they are produced and/or shaped by conventional processes, few research works have characterized duplex steels obtained by additive processes. This paper concerns the elaboration and characterization of super duplex steel SAF 2507 obtained by laser powder bed fusion (LPBF). Firstly, the printability of this steel is discussed by analyzing the impact of certain process parameters on the density and microstructure of the material. This as-built microstructure being ferritic and not very ductile, various heat treatments (HT) are, then, applied in order to obtain the typical two-phase microstructure and thus improve the ductility. Afterward, the impact of the different phases (austenite and ferrite) on its mechanical behavior is analyzed. This work has shown the possibility of obtaining an austenitic-ferritic microstructure close to 50–50 with different grain morphologies with an appropriate post-fabrication TTH. The resulting mechanical properties are satisfactory compared to those of duplex steel obtained by conventional processes.
KW - Additive manufacturing
KW - duplex stainless steel
KW - heat treatment
KW - mechanical behavior
KW - microstructure
U2 - 10.1007/978-3-031-47784-3_1
DO - 10.1007/978-3-031-47784-3_1
M3 - Conference contribution
AN - SCOPUS:85177203090
SN - 9783031477836
T3 - Lecture Notes in Mechanical Engineering
SP - 1
EP - 9
BT - Advances in Additive Manufacturing
A2 - Mabrouki, Tarek
A2 - Sahlaoui, Habib
A2 - Ghanem, Farhat
A2 - Sallem, Haifa
A2 - Benyahya, Nourredine
PB - Springer Science and Business Media Deutschland GmbH
T2 - 2nd Advances in Additive Manufacturing Conference, AIAM 2023
Y2 - 18 May 2023 through 20 May 2023
ER -