Abstract
In the present study, a 9Cr-oxide dispersion strengthened steel was developed and its composite reinforced by Ta layers (ODS/Ta) was also researched. The tensile strength and total elongation of ODS steel is 934 MPa and 11% respectively. The appreciable tensile property is resulted from the bimodal grain size distribution, with micrometre-sized grains and nano-sized grains uniformly distribute in ODS matrix and a large number of nano-sized TiV carbonitride and oxides of YTi in steel. The strength and total elongation of ODS/Ta steel is 1390 MPa and 13.6% respectively. More dimples are observed in ODS matrix of ODS/Ta steel than that in ODS steel, indicating better ductility. While Ta exhibits cleavage fracture due to the strong restriction by the strong interface and the ductility of ODS matrix near the interface has also been restricted. Even so, layered structure has still improved the strength and ductility. Enhanced flaw resistance by layered structure, the cracking and pulling out of Ta that dissipate energy all contribute to the improved toughness of ODS/Ta steel. In the future, interface transitional layers or another layered toughening system will be designed to generate larger toughening effect of layered ODS system.
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