SEDL / STP / STP1047-EB / STP24952S

Decrease of Ductility Due to Hydrogen in Fe-Cr-Mn Steel

Igata, N
Science University of Tokyo, Chiba Prefecture,

Osada, T
Science University of Tokyo, Chiba Prefecture,

Nagato, T
Science University of Tokyo, Chiba Prefecture,

Tsunakawa, H
University of Tokyo, Tokyo,

Sekiguchf, T
Nippon Metal Industry Co., Ltd., Kanagawa Prefecture,

Pages: 8    Published: Jan 1990

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Abstract

The decrease of ductility due to displacement damage and nuclear transmutation damage by 14-MeV neutrons are major problems to be considered in the selection of fusion reactor materials. In this study with reduced activation Fe-18Cr-15Mn steel, the effect of hydrogen on ductility was investigated by using an electrolytic charging method as a simulation for the (n,p) transmutation effect. The state of hydrogen was clarified by internal friction, X-ray and electron microscopy. The hydrogen peak was found and its parameters were estimated as τ⁰ = 5.8 × 10^-13 sec and H = 0.52eV. In this solute state, the work hardening coefficient and uniform ductility decreased as the charging time increased. This effect was discussed from dislocation phenomenological theory.