熔接用諸鋼材の連続冷却変態図(第 4 報) : 高張力鋼 Wel-ten 50 について

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The authors reported already on the continuous cooling transformation dragrams of steels "Wel-ten 55". In this report, they constructed two continuous cooling transformation diagrams in case of maximum heating temperature 1350℃ for the high tensile steels "Wel-ten 50", which are the same type as the steel "Wel-ten 55" but different in ultimate tensile strength. The following results were obtained : 1. For the steel YD having ultimate tensile strength of about 51kg/(mm)^2,of which A_3-transformationpoint is 821℃ and A_1-point 704℃, critical cooling times from A_3-point to 500℃ are determined as follows; C_z′=1.4sec, C_f′=2.3sec, C_p′=9.2sec, C_e′=320sec. The 50% martensite cooling time is 3.6 sec. 2. For the steel YE having ultimate tensile strength of about 54kg/(mm)^2,of which A_3-point is 819℃ and A_1-point 702℃, critical cooling times are determined as followed; C_z'=2.0sec, C_f′=3.7sec, C_p′=21 sec C_e′=370sec. The 50% martensite cooling time is 5.3 sec. 3. For both steels YD and YE, the finishing tempratures of martensite transformation M_F could be observed fairly clearly. For the steel YD, the starting temperature of martensite transformation M_S is 405℃ and its finishing temperature M_F 225℃. For the steel YE, M_S-temperature is 400℃ and M_F 220℃. 4. The each critical cooling times and 50% martensite cooling time of steel YE, of which carbon and manganese contents are higher, are larger than those of steel YD respectively. That is, in cases of the same trade mark "Wel-ten 50", it is recognized that each critical cooling times and 50% martensile cooling times of steels change with chemical composition, consiting of carbon, manganese and other contents.
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 4 報) : 高張力鋼 Wel-ten 50 について

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