MICROSTRUCTURE EVOLUTION DURING CYCLIC TESTS ON EUROFER 97 AT ROOM TEMPERATURE. TEM OBSERVATION AND MODELLING

MARIA FLORENCIA GIORDANA; PIERRE-FRANCOIS GIROUX; IRIS ALVAREZ-ARMAS; MAXIME SAUZAY; ALBERTO ARMAS; THOMAS KRUML

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2012 vol. 550 p. 103 - 111

0921-5093

The 9% Cr quenched and tempered reduced-activation ferritic/martensitic steel EUROFER 97 is one of the candidates for structural components of fusion reactors. Isothermal, plastic strain-controlled, low-cycle fatigue tests are performed. Tested at room temperature, this steel suffers a cyclic softening effect linked to microstructural changes observed by transmission electron microscopy, such as the decrease of dislocation density inside subgrains or the growth of subgrain size. From the assumed mechanisms of softening a simple mean-field model based on crystalline plasticity is proposed to predict these microstructure evolutions during cycling and monotonic deformation.