Structure Formation in Low-Alloy Pipe Steel during Heating in the Intercritical Temperature Range

摘要

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 a-phase recrystallization and the formation of the y phase in two ways-via the heredity mechanism and by an orientation-unrelated growth.