日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 4 (1957),
pp. 221-225

On the Breaking Behaviours in Charpy Impact Bending Tests

Minoru Tanaka and Sôkichi Umekawa


Abstract:

The load-time curves in the Charpy impact bending tests have been obtained by a new-designed impact force detector using Rochelle salt crystal, such as shown in Fig. 1. After many tests for high-strength structural steel, heat-treated tool steel and pure copper, the breaking behaviours in Charpy impact bending tests were classified into four types as represented schematically in Fig. 3a, b, c and d. Consequently, the meanings of Charpy values should be distinguished between the materials broken off in the type of Fig. 3a or b, and in the type of Fig. 3c or d, even when the Charpy values were the same. From the results obtained on the high-strength structural steel, Welten, produced in Japan, it has become known that a suitable normalizing will improve remarkably the cold-notch shortness of the hot-rolled plate, as shown in Photo. 5 and 6.


(Received 1956/11/19)

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