| Autor: |
de Sanctis, Massimo, Fava, Alessandra, Lovicu, Gianfranco, Montanari, Roberto, Richetta, Maria, Testani, Claudio, Varone, Alessandra |
| Zdroj: |
Materials Science Forum; December 2018, Vol. 941 Issue: 1 p257-262, 6p |
| Abstrakt: |
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. |
| Databáze: |
Supplemental Index |
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