應力下に於ける鋼中水素の擧動 (I)

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Among the several theories on the cause of flaking in steel, the hydrogen theory is most plausible. The theory is acknowledged to be more conclusive if co-working stresses of various kinds are taken into account, but the relation between both factors has been left rather unnoticed. The authors found, as formerly reported in this Journal, (Tetsu-to-Hagane, No.5, 1953 p.524∿531) that the evolution of hydrogen from steel specimen was accelerated by stress. This report was the first step of the fundamental studies on this finding, the outline of method and results of which were stated as folllows : 1. Experimental method : From a 0.4%C basic steel forging with 180mm dia., at sufficient distance from ends, two adjacent disks of thickness 21mm were removed; then machined and lightly polished to 20mm along the adjoining surfaces of both slices. Next a sheet of cellophane was attached to each finished surface by means of small quantity of oil. While the specimen thus arranged was left in room temperature, the evolving hydrogen was captured between the cellophane and surface in the form of dispersed bubbles, the total area of which showed the rate of evolution. Under the action of stress the area increased, thus indicating the accelerated evolution of hydrogen in a qualitative way. The effect of stress was known by comparison between the two specimens, one of which was a given stress. 2. Results : When the specimens were subjected to stresses under 12 kg/mm^2, tensile or compressive, the promoted evolution of hydrogen by stress was the more marked, if 1) The sharper was the concentration gradient of hydrogen near specimen surface. 2) And the larger was the magnitude of stress.
社団法人日本鉄鋼協会の論文
1954-11-25

應力下に於ける鋼中水素の擧動 (I)

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