Abstract
Effects of the temperatures of preliminary quenching and additional quenching from the intercritical range (ICR) on the impact toughness, hardness, and microstructure of a low-alloy pipe steel have been studied. A complex pattern of structural and phase transformations that occur during holding in the ICR of the initially quenched steel has been shown, namely, the development of the α-phase recrystallization and the formation of the γ phase in two ways—via the heredity mechanism and by an orientation-unrelated growth.
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