耐熱鋼の加熱に依る性質の變化に就いて

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The tensile strength, elongation, number of repeated bending, electric resistance and grain size were measured at room temperature on some heat resisting steels (Fe-Cr & Fe-Cr-Al system) which had been long heated at various temperature from 500° to 1200℃ in a vacuum, hydrogen and nitrogen atmosphere. The results were as follows : The tensile strength and elongation did not vary with the heating below 700℃ in vacuum and hydrogen atmosphere. Even in a heating at 800℃, these values did not so decrease as in a heating in air at the same temperature. But in a nitrogen atmosphere, these values of Al-containing steels rapidly decreased and especially the decrease of elongation was remarkable in the heating at 800℃. Number of repeated bending did not vary in a heating at temperatures below 600℃ but began to decrease by a heating at 700℃ for 5 days. In a heating at 800℃, these values of Al-containing steels decreased largely. These decrease were especially remarkable at heating in a nitrogen atmosphere. These phenomena were attributed both to the grain growth resulting from diffusion of nitrogen into the steels and to the precipitation of AIN. In a heating at temperatures above 900℃, number of repeated bending decreased with shortening of the time of heating. The electric resistance did not nearly vary with long time heating at high temperatures in vacuum and hydrogen atmosphere. But these values of Al-containing steels already decreased with elongation of the time of heating at temperatures above 800℃. The grains of Al-containing steels with high value of an Al% : Cr% ratio begin to grow with elongation of the time of heating even at 700℃ and grew remarkably at temperatures above 900℃ even by a short time heating. Especially nitrogen promoted grain growth by its diffusion at high temperatures. When heated to above 1100℃, grain growth was so remarkable that we could not appreciate the influence of nitrogen upon the grain growth.
社団法人日本鉄鋼協会の論文
1952-04-25

耐熱鋼の加熱に依る性質の變化に就いて

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