鉄および鋼の水素誘起割れ初期段階の透過実験(<小特集>衝撃小特集)

概要

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Hydrogen permeation experiments were performed continuously over 45 hours on iron and steels (0.007〜0.19%C) by an electrochemical method (nickel-plating method). The hydrogen was charged cathodically with a constant current density, 40A/m^2, in two buffer solutions. The blisters were observed opticaly and electron scanning microscopically. The hydrogen diffusivity (D) and hydrogen content (C_0) were kept constant during hydrogen permeation when an acetic buffer solution was used. However, D decreased and C_0 incresed with permeation time, when a boric buffer solution was used. In the latter, many blisters were formed in the specimens during the permeation, but there was no blister in the former because C_0 was less than 0.1ppm. Blisters were formed at nonmetallic inclusions, AL_2O_3. These hydrogen permeation behaviors are discussed by the hydrogen trap effect at nonmetallic inclusions and at blisters around nonmetallic inclusions.
1987-12-15