Abstract
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. 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. 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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