Abstract
The paper studies kinetics of austenitic grain growth (when heating) and the peculiarities of phase transformations (when cooling) that depend on the manufacturing technology of high-strength steel. The method of vacuum etching has been applied to reveal former austenitic grain boundaries in steel. It is shown that the necessary homogeneous structure in morphology and dimensions of structural elements in martensitic steels is formed under the influence of additional quenching from furnace heating with tempering after quenching from rolling heating.
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