Ag. Zaluzhnyi et al., HYDROGEN PENETRATION THROUGH STRUCTURAL-MATERIALS DURING HYDROGEN-IONBOMBARDMENT, Fusion engineering and design, 41, 1998, pp. 129-134
The hydrogen permeability of 99.98% pure nickel pre-irradiated by the
light ions of He, O, N, or C was studied as well as the hydrogen perme
ability of the same material under simultaneous bombardment by the sam
e light ions and hydrogen ions. The experiments were carried out in th
e 100-300 degrees C temperature range. The energy of these light ions
used for irradiation was 30 keV, while the irradiation doses varied fr
om 1 x 10(21) m(-2) to 1 x 10(23) m(-2). It was found that both of the
se types of irradiation caused the hydrogen permeability of the studie
d materials to decrease. The extent of decrease in hydrogen permeabili
ty was higher in the case of simultaneous bombardment of a sample with
the hydrogen ions and ions of one of the light elements mentioned abo
ve. Investigations on the hydrogen permeability of nickel and type 16-
15 stainless steel with certain structural features under hydrogen ion
bombardment were also carried out. The influence of preliminary cold
working (5, 15, 30, and 50%) on the hydrogen penetration as well as th
e effect of the grain size on the hydrogen permeability of these mater
ials were also investigated. The grain size of the samples was in the
3-5, 30-50, and 400-600 mu m ranges. The experiments were carried out
at 150 and 200 degrees C. It was found that preliminary cold working o
f the studied materials, as a rule, increased their hydrogen permeabil
ity. The investigation of the effect of grain size on the degree of hy
drogen penetration through the steel showed that it was practically th
e same for the large-grain and medium-grain steel. The hydrogen permea
bility of the small-grain steel was about twice as that of the large-
and medium-grain steel. Investigations on the hydrogen permeability (H
P) through structural materials under simulation of thermonuclear reac
tor (TR) working conditions are very important in connection with solv
ing the material science problems of controlled thermonuclear fusion (
CTF). (C) 1998 Elsevier Science S.A. All rights reserved.