Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-591-C7-596
Plasticity of oxide dispersion strengthened ferritic alloysC. ZAKINE1, C. PRIOUL2, A. ALAMO1 and D. FRANCOIS2
1 Service de Recherches Métallurgiques Appliquées, Commissariat à l'Energie Atomique, 91191 Saclay, France
2 Laboratoire MSS/Mat., URA 850 du CNRS, Ecole Centrale des Arts et Manufactures, Grande Voie des Vignes, 92295 Châtenay-Malabry cedex, France
Two 13%Cr oxide dispersion strengthened (ODS) ferritic alloys, DT and DY, exhibiting different oxide particle size distribution and a X phase precipitation were studied. Their tensile properties have been tested from 20 to 700°C. Experimental observations during room temperature tensile tests performed in a scanning electronic microscope have shown that the main damage mechanism consists in microcraking of the X phase precipitates on grain boundaries. These alloys are high tensile and creep resistant between 500 and 700°C. Their strongly stress-sensitive creep behaviour can be described by usual creep laws and incorporating a threshold stress below which the creep rate is negligible.
© EDP Sciences 1993