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 Y2 O3 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.

De Sanctis, M., Fava, A., Lovicu, G., Montanari, R., Richetta, M., Testani, C., et al. (2018). Temperature dependent mechanical behavior of ods steels. In Materials Science Forum (pp.257-262). KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND : Trans Tech Publications Ltd [10.4028/www.scientific.net/MSF.941.257].

Temperature dependent mechanical behavior of ods steels

Fava A.;Montanari R.;Richetta M.;Varone A.
2018-12-01

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 Y2 O3 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.
10th International Conference on Processing and Manufacturing of Advanced Materials, 2018
fra
2018
Rilevanza internazionale
dic-2018
Settore ING-IND/21 - METALLURGIA
Settore ING-IND/15 - DISEGNO E METODI DELL'INGEGNERIA INDUSTRIALE
English
Low-energy mechanical alloying; Mechanical properties; Nanostructure; ODS steel; Strengthening mechanisms
http://www.ttp.net/0255-5476.html
Intervento a convegno
De Sanctis, M., Fava, A., Lovicu, G., Montanari, R., Richetta, M., Testani, C., et al. (2018). Temperature dependent mechanical behavior of ods steels. In Materials Science Forum (pp.257-262). KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND : Trans Tech Publications Ltd [10.4028/www.scientific.net/MSF.941.257].
De Sanctis, M; Fava, A; Lovicu, G; Montanari, R; Richetta, M; Testani, C; Varone, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/230938
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