高張力鋼の強制冷却による材質変化について

概要

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In the production of high tensile weldable steels having the tensile strength over 60 kg/mm^2, the allowable ranges of the compositions are quite narrow or the no small scale of heat-treatment equipments are required for quenching and tempering after rolling. In order to avoid these troubles, the authors tried the cooling of materials within the range of Ar3 to Art and from the temperature slightly above Ari down to the room temperature. According to the results obtained by this experiment, the strength increases exponentially and the elongation decreases, with the increase of cooling rate. Impact value is restored within the range of the moderate cooling rate at Ar_3〜Ar_1, but decreases continuously with decreasing the rate from the temperature slightly above Ar_1 Consequently, the accelerated cooling at Ar_3〜Ar_1 instead of air cooling during the normalizing operation is effective owing to the recovery of impact value.
社団法人溶接学会の論文
1958-02-25