熔接用諸鋼材の連続冷却変態図(第 3 報) : 35,42 および 49kg/(mm)^2 軟鋼材について

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The continuous cooling transformation diagrams in case of maximum heating temperature 1350℃ were constructed fo three kinds of rimmed-, semi-killed-and kliled-mild steel of which ultimate tensile strengths are 35,42 and 49kg/(mm)^2. As the critical cooling times of those steels are generally remarkably smaller, it is difficult to construct those continuous cooling transformation diagrams. However, when the new apparatus for thermal analysis manufactured by the authors is used, the transformation temperatures and the cooling curves can be determined accurately even in the case of cooling time from 800℃ to 500℃ being shotter than 1sec. The following results were obtained : 1. For the rimmed steel having ultimate tensile strength of about 35kg/(mm)^2,of which A_3-transformation-point is 871℃ and A_1-point 729℃, critical cooling times from A_3-point to 500℃ are determined as follows; C_z′=0.17sec, C_f′=0.27sec, C_p′=2.0sec, C_e′=23sec. The cooling time corresponding to 50% martensite is 0.47sec and M_s-temperature 435℃. 2. For the semi-killed steel having ultimate tensile strength of about 42kg/(mm)^2,of which A_3-point is 842℃ and A_1-point 719℃, critical cooling times are determined as follows; C_z′=0.26sec, C_f′=0.40sec, C_p′=2.0sec, C_e′=55sec. The cooling time corresponding to 50% martensite is 0.88 ec and M_s-temperature 420℃. 3. For the killed steel having ultimate tensile strength of about 49kg/(mm)^2,of which A_3-point is 832℃ and A_1-point 718℃, critical cooling times are determined as follows C_z′=0.68sec, C_f′=1.04sec, C_p′=10.0sec, C_e′=140sec. The cooling time corresponding to 50% martensite is 1.5 ec and M_s-temperature 415℃. 4. Each critical cooling times and the cooling time corresponding to 50% martensite tend to become large generally with increase of carbon, manganese and silicon contents of a steel.
社団法人溶接学会の論文
1959-08-25

熔接用諸鋼材の連続冷却変態図(第 3 報) : 35,42 および 49kg/(mm)^2 軟鋼材について

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