Cleavage separations in warm-rolled lowcarbon steels

Abstract

Rolling of low-carbon steels at 650°C produces a crystallographic texture in which both {100} and {111}planes are aligned parallel to the rolling plane. This texture gives rise to cleavage separations on Charpy specimens, which become visible after rolling strains of ER∼0·6. They run parallel to the rolling plane and are associated with the presence of the {100} textural component. A mechanism is proposed for their formation. Their occurrence leads to a rising upper shelf on the Charpy energy-absorbed curve and a lowering of the impact transition temperature to below that of the as-hot-rolled stock.