鋼の熱脆性に及ぼす熱處理及び成分の影響

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There are various kinds of heat-brittleness of steel, these being more or less related to the cracks due to the cooling or forging of steel, the defects of steel at high temperatures, etc. The characteristics and causes of the heat-brittleness are not yet fully revealed. The author, therefore, carried out experiments on the relation of the heat-brittleness and heat-treatment, using two kinds of carbon steel and one kind of nickel-chromium steel. It was thereby concluded, that (1) the precipitation hardning of super-saturated cementite disolved in α iron at a temperature below the transformation point becomes the cause of brittleness at a lower temperature independent to the blue-shortness, (2) the temperature at which the blue shortness occurs is invariable to the cooling velocity provided that martensite is not formed, and (3) the so called secondary brittleness appears only when the crystal grain is coarsened by annealing at a high temperature such as forging temperature. Next, experiments were carried out on about 30 different special steels. It resulted in the conclusion that (1) all the elements, C, Ni, Cr, Mo, Mn, Si, etc., augment the secondary brittleness, particularly the effects of C and Mn being most remarkable ; (2) Cr and Mn shift the secondary brittleness to a lower termperature ; (3) there are a special brittleness near the transformation point which seems to be related to Si and Mn content but even in the steel of the same compositions the special brittleness occurs if the melting differs.
社団法人日本鉄鋼協会の論文
1938-01-25

鋼の熱脆性に及ぼす熱處理及び成分の影響

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