鐵鋼中の含有瓦斯に關する研究(第 3 報) : 鋼塊内の水素分布及其の擴散に就て

概要

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By improving the vacuum fusion method apparatus, the accuracy of hydrogen analysis is so increased that it is possible to draw a distribution map of hydrogen in a solid ingot section. As a result it is found that hydrogen content is gradually increased from outer to inner part of the ingot, making nearly homocentric equiconcentration lines. The distribution is caused by the hydrogen diffusion in solid steel after solidification. The stress set up by dissolved hydrogen in ingots is calculated using the data obtained. Under certain circumstances the pressure of hydrogen in a small fissure would increase to overcome the strength of steel, though it has a much lower value in actual cases owing to its high diffusion velocity. The author observed the white spots in a steel billet in which practically no hydrogen was present. It is, however, confirmed that hydrogen promotes the developement of the white spots, but not to be the principal cause of it.
社団法人日本鉄鋼協会の論文
1937-01-25