29th Symposium on Fusion Technology (SOFT 2016)

P3.191 Fracture toughness of the new generation ODS steels with different oxide compositions

7 Sep 2016, 11:00

1h 20m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 191

Poster I. Materials Technology P3 Poster session

Speaker

Filip Siska (Institute of Physics of Materials)

Description

ODS steels are candidates for the structural material in the future fusion power plants. Their main advantage is high strength and creep resistance at high temperatures. Such high performance is achieved by the presence of the oxide particles in the microstructure. Nowadays, the best ODS steels contain particles of Y2O3 which are stable at high temperatures. However, yttrium is expensive and its reserves are limited. Therefore, the new generation of the ODS steels has been developed and tested in our institute. Steels with 9 and 14% of chromium and different oxide compositions (Zr, Ti, Al) are tested. The main objective is to further improve the steels properties and test other elements which can replace yttrium. Fracture toughness is an important variable for construction materials. The current study evaluates fracture toughness for these new steels in the wide temperature range (-80°C - 600°C). The results are compared with up to date most advanced ODS steels 12YWT and 14YWT. The newly developed steels show higher fracture toughness and lower brittle-ductile transition temperature. Such results are promising in the future development of structural materials for high temperature applications and particularly fusion power plants.