Temperature Dependent Mechanical Behavior of ODS Steels

Abstract:

An oxide dispersion strengthened (ODS) ferritic steel with nanometric grain size has been produced by means of low-energy mechanical alloying (LEMA) of steel powder (Fe-14Cr-1W-0.4Ti) mixed with Y₂O₃ particles (0.3 wt%) and successive hot extrusion (HE). The material has equiaxed grains (mean size of 400 nm) and dislocation density of 4 x 10¹² m^-2, and exhibits superior mechanical properties with respect the unreinforced steel. The mechanical behavior has been compared with that of ODS steels prepared by means of the most common process, high-energy mechanical alloying (HEMA), consolidation through hot isostatic pressing (HIP) or hot extrusion (HE), annealing around 1100 °C for 1-2 hours, which produces a bimodal grain size distribution. The strengthening mechanisms have been examined and discussed to explain the different behavior.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 257-262
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.257
• Online since: December 2018
• Authors: Massimo de Sanctis, Alessandra Fava*, Gianfranco Lovicu, Roberto Montanari, Maria Richetta, Claudio Testani, Alessandra Varone
• Keywords: Low-Energy Mechanical Alloying, Mechanical Properties, Nanostructure, ODS Steel, Strengthening Mechanisms

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