SUS304, SUS304L, SUS310S, SUY-1のクリープ特性に及ぼす水素の影響

抄録

The objective of this study is to accumulate creep data in hydrogen of various materials in order to consider the mechanisms that hydrogen affects creep properties. Creep testing was performed in argon and hydrogen gases at 873K. The materials were JIS SUS304, SUS304L and SUS310S austenitic stainless steels and JIS SUY-1 commercial pure iron. For all materials, the creep life was reduced in hydrogen compared to that in argon to a greater or lesser extent. The creep ductility in hydrogen was higher than that in argon except for the pure iron. The mechanism that hydrogen reduced the creep life of the SUS304 we considered was the accelerated dislocation climb mediated by hydrogen increased vacancy concentration. According to the literatures, decarburization, carbide formation and hydrogen enhanced localized plasticity (HELP) were investigated. It was confirmed that these mechanisms were not activated in our creep test for the SUS304.