TY - JOUR
T1 - Precipitates and boundaries interaction in ferritic ODS steels
AU - Sallez, Nicolas
AU - Hatzoglou, Constantinos
AU - Delabrouille, Fredéric
AU - Sornin, Denis
AU - Chaffron, Laurent
AU - Blat-Yrieix, Martine
AU - Radiguet, Bertrand
AU - Pareige, Philippe
AU - Donnadieu, Patricia
AU - Bréchet, Yves
PY - 2016/4/15
Y1 - 2016/4/15
N2 - In the course of a recrystallization study of Oxide Dispersion Strengthened (ODS) ferritic steels during extrusion, particular interest was paid to the (GB) Grain Boundaries interaction with precipitates. Complementary and corresponding characterization experiments using Transmission Electron Microscopy (TEM), Energy Dispersive X-ray spectroscopy (EDX) and Atom Probe Tomography (APT) have been carried out on a voluntarily interrupted extrusion or extruded samples. Microscopic observations of Precipitate Free Zones (PFZ) and precipitates alignments suggest precipitate interaction with migrating GB involving dissolution and Oswald ripening of the precipitates. This is consistent with the local chemical information gathered by EDX and APT. This original mechanism for ODS steels is similar to what had been proposed in the late 80s for similar observation made on Ti alloys reinforced by nanosized yttrium oxides: An interaction mechanism between grain boundaries and precipitates involving a diffusion controlled process of precipitates dissolution at grain boundaries. It is believed that this mechanism can be of primary importance to explain the mechanical behaviour of such steels.
AB - In the course of a recrystallization study of Oxide Dispersion Strengthened (ODS) ferritic steels during extrusion, particular interest was paid to the (GB) Grain Boundaries interaction with precipitates. Complementary and corresponding characterization experiments using Transmission Electron Microscopy (TEM), Energy Dispersive X-ray spectroscopy (EDX) and Atom Probe Tomography (APT) have been carried out on a voluntarily interrupted extrusion or extruded samples. Microscopic observations of Precipitate Free Zones (PFZ) and precipitates alignments suggest precipitate interaction with migrating GB involving dissolution and Oswald ripening of the precipitates. This is consistent with the local chemical information gathered by EDX and APT. This original mechanism for ODS steels is similar to what had been proposed in the late 80s for similar observation made on Ti alloys reinforced by nanosized yttrium oxides: An interaction mechanism between grain boundaries and precipitates involving a diffusion controlled process of precipitates dissolution at grain boundaries. It is believed that this mechanism can be of primary importance to explain the mechanical behaviour of such steels.
UR - https://www.scopus.com/pages/publications/84959010724
U2 - 10.1016/j.jnucmat.2016.01.021
DO - 10.1016/j.jnucmat.2016.01.021
M3 - Article
AN - SCOPUS:84959010724
SN - 0022-3115
VL - 472
SP - 118
EP - 126
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -