Recrystallization in low-alloy steels after hot deformation

The principles are investigated governing the process of recrystallization following the compressive strain by 10 to 30% at 1200 to 900 deg C for steels 12C2B and 09G2. Attention is given to the kinetics of structure formation at various austenitization temperatures making it possible to vary the size of the initial austenite grain, and also the relation between the niobium in the solid and carbonitride phase (for steel 12G2B). For steel 12G2B the heating temperatures have been 1280, 1200, 1000 and 950 deg C, while the samples of steel 09G2 heated to 1200, 1000 and 950 deg C. It is shown that as the temperature is decreased and the degree of reduction is increased in the austenite region, and also the time interval is raised up to 30 s upon reduction, steel 09G2 exhibits the smaller austenite grain size and variation there-of