熔接用諸鋼材の連続冷却変態図(第7報) : 90kg/mm^2低合金鋼について

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For the steel DT containing low carbon, Ni, Mo, V and B, of which ultimate tensile strength is about 90 kg/mm^2 in the state quenched from 930℃ and water cooled after tempering for Ihr at 630℃, as well as USS "T-l" steel, the continuous cooling transformation diagram in case of maximum heating temperature 1350℃ was constructed. Then this continuous cooling transformation diagram was compared with that obtained in case of maximum heating temperature 1093℃ by Nippes, Savage and Allio. The following results were obtained : 1. The A_3-transformation point of steel DT is extremely low. In the continuous cooling transformation diagram, the time at the Ac3 temperature 833℃ was adopted as 0 sec of a datum point. 2. Critical cooling times of steel DT are determined as follows ; C_z'=6 sec, C_f'=18 sec, C_p'=56 sec, C_e'>-2000 sec. The cooling time corresponding to 50% martensite is 18.5 sec, namely, near the value of C_f'. 3. The positions of the beginning curves and the ending curves of each consitituents of microstructures in the authors' continuous cooling transformation diagram in case of maximum heating temperature 1350℃, remove to the longer cooling time and lower temperature side, compared with those in the continuous cooling transformation diagram in case of maximum heating temperature 1093℃ constructed by Nippes, Savage and Allio. 4. In the author's continuous cooling transformation diagram, critical cooling time C_z', C_f', C_p', 50% martensite cooling time and others are determined, but in that diagram by Nippes, Savage and Allio, C_z' critical cooling time was only determined and 4.6 sec of the value is smaller than 6 sec of the author's value.
社団法人溶接学会の論文
1959-12-25

熔接用諸鋼材の連続冷却変態図(第7報) : 90kg/mm^2低合金鋼について

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