低温用鋼の再現溶接熱影響部の破壊靭性について(第 1 報)

概要

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Fracture toughness, J_Ic in synthetic weld-heat affected zone of Al killed steel and its recovery by following reheating were investigated by three point bend test in low temperature range. Synthetic weldheat affected zone was obtained by rapid heating at peak temperature 1250℃ or 1350℃ and by cooling for 10 sec or 80 sec from 800℃ to 500℃. Following reheating was given by rapid heating at peak temperature from 700℃ to 1000℃ and by cooling for 10 sec or 80 sec from 800℃ to 500℃. Main results obtained were as follows. (1) J_Ic values in synthetic HAZ were inferior to those of as-received steel in every test temperature. (2) Remarkable recovery of J_Ic value was obtained in a synthetic HAZ heated at 1350℃ and cooled for 10 sec from 800℃ to 500℃, by following heating at 700℃ and cooling for 53 sec from 700℃ to 500℃, due to form tempered martensite and bainite structure mainly. (3) Maximum J_Ic was obtained ta T_c=20 sec, changing cooling time, T_c from 800℃ to 500℃ in a synthetic HAZ heated at peak temperature 1350℃. (4) Hall-Petch relation of J_Ic vs L^<-1/2> was recognized between J_Ic and facet size, L.
社団法人溶接学会の論文
1981-10-05