溶接用諸鋼材の冷却時間と脆性(第 4 報) : V ノッチ・シヤルピー衝撃試験について

概要

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In the present report the V-notch Charpy impact tests of specimens heated to 1350℃ and cooled with various rate were performed. The results are as follows; (1) If a kind of steel is subjected to a thermal cycle of max. heating temperature 1350℃, the transition temperature of the steel tends to become generally higher, and the absorbed energy and the bended angle at 0℃ become lower. (2) When the cooling of a thermal cycle is comparatively slow, that is, in the case of that the intermediate structure and pearlite disperse finely in the ferrite matrix of the specimen, the absorbed energy and the bended angle of the specimen at 0℃ are comparatively large. (3) The absorbed energy and the bended angle at 0℃ in the case of the V-notch Charpy impact test are affected by the carbon content of steel, and the carbon content of a steel is desired to be lower for obtaining high values, as well as the case of non-notch bending test. (4) According to results of the V-notch Charpy impact test carried out to evaluate the brittleness or ductility of specimens submitted to thermal cycles, it is difficult to clarify differences among properties of various steels. Therefore, the non-notch bending test proposed by the authors seems to be more suitable than the V-notch Charpy impact test, for evaluation of weldabilities of steels.
社団法人溶接学会の論文
1960-07-25