異なる表面粗さを施したSUS430ステンレス鋼の水素発生電位下における低ひずみ速度引張試験
1990 年 39 巻 442 号 p. 1026-1031
詳細
1990 年 39 巻 442 号 p. 1026-1031
In order to elucidate the relation between hydrogen embrittlement and surface roughness, slow strain rate tension tests were carried out under various hydrogen evolution potentials, -0.1--2.0V (vs. S.C.E.), on ferritic stainless steel SUS430, surface roughness of which is varied in there sizes, 0.75, 3.5 and 5.0μm.
The results obtained are summarized as follows:
(1) The reduction in area and the time to fracture, which are the indicators of the degree of embrittlement of specimen, decreased at low hydrogen evolution potentials. The similar behavior was also observed when the specimen was held for longer time at each hydrogen evolution potential.
(2) When the specimen surface roughness was large, the reduction in area and the time to fracture decreased at all setting potentials. The influence of specimen surface roughness on the embrittlement phenomena is summarized in the order of specimen A (0.75μm)<specimen B (3.5μm)<specimen C (5.0μm) because the reduction in area becomes smaller and the time to fracture becomes shorter in this order.
