Journal
MATERIALS CHARACTERIZATION
Volume 117, Issue -, Pages 91-98Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.04.022
Keywords
Ultrafine grained microstructure; ODS steel; Mechanical alloying; Grain boundaries; TEM; Zener pinning
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Funding
- Korea Atomic Energy Research Institute RD program [527520-15]
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Ultrafine grained austenitic oxide dispersion strengthened steel was prepared by mechanical alloying of the elemental metal powders and Y2O3 powders, then by hot isostatic pressing, hot rolling and solution annealing. The average grain size of the sample was about 260 nm, and the grain structure was stable after isothermal heat treatment at 1150 degrees C (similar to 0.8 T-m) for 1000 h. The high thermal stability of the grain structure is mainly attributed to the uniformly dispersed semi-coherent Y2Ti2O7 particles of about 5 nm in diameter. The particles appear to have a strong pinning effect on grain boundaries due to the semi-coherent interface character between particles and the matrix at 1150 degrees C. A decrease of the number density of Y2Ti2O7 particles and coarsening of the particles on the grain boundaries was observed during heat treatments at 1200 degrees C and 1250 degrees C, resulting in a steady grain growth at these temperatures. (C) 2016 Elsevier Inc. All rights reserved.
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