SYMPOSIA PAPER Published: 01 January 1990

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


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.

Author Information

Igata, N
Science University of Tokyo, Chiba Prefecture, Japan
Osada, T
Science University of Tokyo, Chiba Prefecture, Japan
Nagato, T
Science University of Tokyo, Chiba Prefecture, Japan
Tsunakawa, H
University of Tokyo, Tokyo, Japan
Sekiguchf, T
Nippon Metal Industry Co., Ltd., Kanagawa Prefecture, Japan
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Developed by Committee: E10
Pages: 103–110
DOI: 10.1520/STP24952S
ISBN-EB: 978-0-8031-5113-0
ISBN-13: 978-0-8031-1267-4