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Report No.

Fabrication and evaluation of ODS ferritoc mother tubes for FBR fuel cladding tubes; Evaluation of the mechanical properties and recrystallization

Okuda, Takanari*; Harada, Makoto*; not registered

Micro-crystal direction analysis by electron back scattering pattern, oxide particle dispersion parameter analysis and the mechanical properties were evaluated, The main results were as follows: (1)Microstructure. Although the ferritic steels were equi-axed grains in the transverse direction of tube, the aspect ratio increased with Ti and Y$$_{2}$$O$$_{3}$$ content of the steel. The 20% cold worked tubes were high densities of dislocation. The martensitic steels were equi-axed grains both in transverse and longitudinal directions. M91 steel was a ferritic structure and low dislocation density. M92 steel was a full martensitic. (2)Tensile properties in the circumferential direction. The uniform elongation of ferritic steel was lowest at 400 $$^{circ}$$C. In the martensitic steels, M92 steel with high Ti content showed a high strength and good ductility. (3)Creep rupture strength. For the ferritic steels, the internal creep rupture strength at 700 $$^{circ}$$C because higher as Ti and Y$$_{2}$$O$$_{3}$$ content increased. The martensitic steels showed high creep rupture strength by controlling the addition of Ti and Y$$_{2}$$O$$_{3}$$. (4)Recrystallizaiton analysis of ferritic steels by EBSP. By the sequence of cold rolling and heat treatment, recrystallization became difficult. For a stable direction, ${hkl}$$$<$$110$$>$$ tends to form a strong texture. (5)Evaluation for distribution parameter of oxide particles. The threshold stress, which was calculated by the combination of the volume fraction of dispersoids and image analysis, exhibited reasonable results.



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