J. Japan Inst. Metals, Vol. 36, No. 1 (1972),
Effect of Carbon on Fracture Toughness of Iron
Hajime Nakamura1, Torazo Naiki1 and Hisaki Okabayashi1
1Ishikawajima-Harima Heavy Ind. Co., Ltd., Research Institute, Tokyo
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. where, Gic is the fracture toughness value, G0 and T0 material constants, and T the absolute temperature.
The relationship between fracture toughness and testing temperature at low temperatures is
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.
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