日本金属学会誌

J. Japan Inst. Metals, Vol. 36, No. 1 (1972),
pp. 82-85

Effect of Carbon on Fracture Toughness of Iron

Hajime Nakamura1, Torazo Naiki1 and Hisaki Okabayashi1

1Ishikawajima-Harima Heavy Ind. Co., Ltd., Research Institute, Tokyo

Abstract:

Effect of carbon on fracture toughness was studied in poly-crystalline iron-carbon alloys with low carbon content (0.034 to 0.30 wt%). The results obtained are as follows.
The relationship between fracture toughness and testing temperature at low temperatures is

Gic = G0 exp T/T0,
where, Gic is the fracture toughness value, G0 and T0 material constants, and T the absolute temperature.
G0 is dependent on carbon content but is independent of the structure. In the materials as-quenched, G0 Values increase with increasing carbon content. And the G0 values become a constant values when the material is fully tempered.
T0 depends on the structure. And 1/T0 values increase with decreasing carbon content or grain size.


(Received 1971/10/1)

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