Conclusions
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1.
The presence of structurally-free ferrite in the core increases the impact toughness and reduces the bending strength of carburized samples with stress concentrators.
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2.
The impact-fatigue strength of carburized samples with structurally-free ferrite in the core is substantially lower at all stresses than that of samples with a homogeneous structure.
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3.
The lower impact-fatigue strength of carburized samples with structurally-free ferrite in the core is explained by the higher rate of crack development in the heterogeneous structure than in the homogeneous structure.
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Additional information
Tomsk Civil Engineering Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 51–54, April 1972.
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Kozyrev, G.V., Toporov, G.V. & Kozyreva, R.A. Effect of structurally-free ferrite in the core on the impact-fatigue strength of carburized steels. Met Sci Heat Treat 14, 337–339 (1972). https://doi.org/10.1007/BF00657025
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DOI: https://doi.org/10.1007/BF00657025