학술논문
Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel.
Document Type
Article
Author
Source
Subject
*FERRITIC steel metallography
*METAL microstructure
*ANNEALING of metals
*METAL extrusion
*THERMAL stability
*OXIDE coating
THERMAL properties of steel
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Language
ISSN
0022-2461
Abstract
In this study, the stability of grain size and oxide nanoparticles in the ODS steel upon annealing at high temperature (650-1350 °C) has been evaluated. The ODS Fe-Cr-W-Ti-YO steel has been manufactured by powder metallurgy, consolidated by hot isostatic pressing and processed by hydrostatic extrusion. Such a processing brings about ultrafine grain structure reinforced with oxide nanoparticles (few nm in diameter) and results in superior mechanical properties. The stability of nano-oxides has been analyzed by small angle X-ray scattering together with transmission electron microscopy. The results obtained revealed excellent thermal stability of ultrafine grained ODS ferritic steel, which was attributed to the resistance of oxides against coarsening. [ABSTRACT FROM AUTHOR]