TY - JOUR
T1 - Microstructural Evolution of Cr-Rich ODS Steels as a Function of Heat Treatment at 475 °C
AU - Foxman, Zvi
AU - Sobol, Oded V.
AU - Pinkas, Malki
AU - Landau, Alex
AU - Hähner, Peter
AU - Krsjak, Vladimir
AU - Meshi, Louisa
PY - 2012/8
Y1 - 2012/8
N2 - In the current research, the effect of heat treatment on the morphology of the dispersoids and their phase composition were investigated in three Cr-rich ferritic oxide dispersion strengthened (ODS) steels: PM2000, MA956, and ODM751. The steels were aged at 475 °C for times ranging from 100 to 1,000 h. The microstructure was characterized using transmission electron microscopy. Study of the as-recrystallized samples revealed nano-scale Y-Al-O complex-oxide particles dispersed in the ferritic matrix. These dispersoids, which differ in size (10-160 nm) and geometry (polygonal and spherical), were identified as Y4Al2O9, YAlO3, and Y3Al5O12. After heat treatment, a significant change in the morphology, size, and distribution of the dispersoids was observed. Changes in the phase composition of the oxide dispersoids were also observed: YAlO3(with perovskite structure) was identified as the most dominant phase, indicating that it is probably the most stable phase in the Cr-rich ferritic ODS steels.
AB - In the current research, the effect of heat treatment on the morphology of the dispersoids and their phase composition were investigated in three Cr-rich ferritic oxide dispersion strengthened (ODS) steels: PM2000, MA956, and ODM751. The steels were aged at 475 °C for times ranging from 100 to 1,000 h. The microstructure was characterized using transmission electron microscopy. Study of the as-recrystallized samples revealed nano-scale Y-Al-O complex-oxide particles dispersed in the ferritic matrix. These dispersoids, which differ in size (10-160 nm) and geometry (polygonal and spherical), were identified as Y4Al2O9, YAlO3, and Y3Al5O12. After heat treatment, a significant change in the morphology, size, and distribution of the dispersoids was observed. Changes in the phase composition of the oxide dispersoids were also observed: YAlO3(with perovskite structure) was identified as the most dominant phase, indicating that it is probably the most stable phase in the Cr-rich ferritic ODS steels.
KW - Heat treatment
KW - Microstructural characterization
KW - ODS steels
KW - TEM
UR - http://www.scopus.com/inward/record.url?scp=84884213134&partnerID=8YFLogxK
U2 - 10.1007/s13632-012-0028-6
DO - 10.1007/s13632-012-0028-6
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AN - SCOPUS:84884213134
SN - 2192-9262
VL - 1
SP - 158
EP - 164
JO - Metallography, Microstructure, and Analysis
JF - Metallography, Microstructure, and Analysis
IS - 3-4
ER -