溶接熱影響部の脆性挙動に関する研究(第 1 報) : 41,60kg/(mm)^2 級鋼板のキンゼル試験でのクラック発生

概要

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The characteristics of crack initiation were examined by Kinzel test about the heat affected zone of SM41 and SM58 steels. The hardnesses of HAZ (H_v) were changed in series by controlling the welding conditions. The notch sharpness (ρ) and depth (t) were also changed. The experiments were carried out to determine the load for micro-crack initiation (P_<ci>) in the temperature ranges of cleavage and fibrous fracturing. Then, the critical value of crack initiating load (P_<ci>) was defined as well as the critical temperature for crack initiation (Tr_<ci>). At the same time, the max. load (P_<max>) and general yielding load (P_<GY>) were measured. The results obtained were summarized as follows. (1) The correlation between P_<ci>, P_<max> and P_<GY> was clarified with Kinzelspecimens having various notch shapes and hardnesses of heat affected zone. It was known also that the first micro-crack initiated would be of shear type, even in the temperature range of apparent cleavage fracturing above Tr_<ci>. (2) The relations between Tr_<ci>, P_<ci> and t/ρ were indicated quantitatively. The correlations between Tr_<ci>, P_<ci> and H_v were also determined.
社団法人溶接学会の論文
1969-11-25