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Fe-Cr-Mn(W, V) austenite steels used as low radioactive structural materials in fusion reactor have been investigated. The results show that the high temperature strength and the creep fracture life of Fe-Cr-Mn(W, V) steels can be effectively improved through (C+N) complex-strengthening, so can be the high temperature ductility. The strength and ductility of the steels are superior to that of SUSS 16 steels and JPCAS below 673 K. The relationship between strength, ductility and the formation temperature is related to the evolution of deformation microstructure. The fracture and microstructure observation above 673 K indicates that the main way to further improve ductility at high temperature is the control of carbide coarsening at the grain boundaries.
The results show that the high temperature strength and the creep fracture life of Fe-Cr-Mn (W, V) steels The strength and ductility of the steels are superior to that of SUSS 16 steels and JPCAS below 673 K. The relationship between strength, ductility and the formation temperature is related to the evolution of deformation microstructure. The fracture and microstructure observation above 673 K indicates that the main way to further improve ductility at high temperature is the control of carbide coarsening at the grain boundaries.