Ivan Tournié

TL;DR: In this article, the authors compared the cyclic behavior of various 9-12%Cr steels, both commercial grades and optimized materials, in terms of creep strength and found that all the tempered ferritic-martensitic steels suffer from a cyclic softening effect linked to the coarsening of the subgrains and laths.

TL;DR: In this article, the tensile properties of a ferritic oxide dispersion strengthened steel produced by hot extrusion at CEA have been evaluated and they prove the studied alloy to be as resistant as and more ductile than the other nano-reinforced alloys of literature.

TL;DR: In this paper, the Monkman-Grant relationship between minimum creep rates and time to fracture holds for a wide range of temperatures and applied stresses and it is observed that there is a clear change in creep mechanism from power-law creep to viscous creep.

TL;DR: In this paper, thermomechanical treatments including normalisation at elevated temperature (1150°C), followed by warm-rolling in metastable austenitic phase and tempering, have been applied on the commercial Grade 91 martensitic steel in order to refine its microstructure and to improve its precipitation state.

TL;DR: Ferritic 14%Cr and 18%Cr ODS steels produced at CEA in round bars or plates were tested mechanically as discussed by the authors, and results obtained in tension, impact, fatigue, creep and toughness tests were carried out at various temperatures and in different directions.