Abstract
In the present study, Ti toughened ODS (ODS/Ti) steels were researched. The effects of N on the formation of Ti(C,N) at the interface of ODS matrix and Ti layer and on the final toughening effect of ODS/Ti steels were studied. 0N, 0.2N-ODS/Ti steels all present inferior tensile properties that much lower than the strength and ductility of the corresponding pure ODS steels. While 0.5N-ODS/Ti steel exhibits extraordinary tensile strength of more than 2300MPa and strain of 13.5%. Elements interdiffusion across the interface of ODS and Ti layer causes the formation of detrimental intermetallic in Ti layer which leads to the inferior tensile properties of 0N-ODS/Ti and 0.2N-ODS/Ti steels. While the formation of a thick continuous Ti(C, N) layer at the interface of 0.5N-ODS matrix and Ti layer can limit the interdiffusion of elements and decrease the contents of brittle intermetallic. Besides, the Ti(C, N) formed at the interface which has intrinsic high strength and the high plasticity of Ti foil are assumed to have contributed to the extraordinary high strength and high ductility of 0.5N-ODS/Ti steel. The effect of multilayers’ interfaces on the toughening and strengthening mechanisms of layered ODS steel needs to be investigated at nano scale in the future.
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