鋼質の、缺陷としての水素脆性の重要性に就て

抄録

The hydrogen contained in ingots vanishes usually during the course of forging and heat-treatment. The hydrogen of about 0·5c.c. per 100 grams may some times remain in the forged material after the heat-treatment due to various reasons, which may cause the hydrogenbrittleness
In this paper, the author points out that this kind of hydrogen-brittleness is not less influential than the sand and ghost brittleness in hurting the toughness of steel, and explans with actual examples that the defect in often mistaken as the seasoning phenomenon from its properties or is liable to be overlooked under the covering of the mass effect. He also describes, that the hydrogen-brittless facilitates the generation of flakes, in accordance with the results of the experimental generation of flakes, and emphasizes that the encouragement of gradual cooling after forging signifies a great importancy in ivew of the hydrogen-brittleness.