Abstract
1. The change in the mechanical characteristics, particularly the yield strength, after aging is greater in coarse-grained than fine-grained steel. 2. Impact bending tests showed that the rise of the cold brittleness threshold after aging is greater for the coarse-grained steel. 3. The somewhat smaller broadening of (310) after aging of the coarse-grained steel, with greater distortion and density of lattice defects after deformation, is evidently due to more intense relaxation processes occurring during aging as compared with the fine-grained steel.
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