Microstructural Evolution of Cr-Rich ODS Steels as a Function of Heat Treatment at 475 °C

Zvi Foxman, Oded V. Sobol, Malki Pinkas, Alex Landau, Peter Hähner, Vladimir Krsjak, Louisa Meshi

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8 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)158-164
Number of pages7
JournalMetallography, Microstructure, and Analysis
Volume1
Issue number3-4
DOIs
StatePublished - Aug 2012
Externally publishedYes

Keywords

  • Heat treatment
  • Microstructural characterization
  • ODS steels
  • TEM

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