EFFECT OF WARM WORKING ON STRUCTURE AND PROPERTIES OF LOW-CARBON STEELS.

Two laboratory-prepared low-carbon steels were hot rolled to bar stock. This material was then preheated at 650 degree C and rolled in single-pass reductions. The longitudinal tensile and impact properties of the warm-rolled products were measured and compared with those of the original stock. The structure of the materials was studied by using conventional optical and electron microscopy and X-ray techniques. The strength increase is associated with the reduction in effective grain size and the introduction of a recovered substructure. The improvements in transition temperature at the higher strains are the result of cleavage separations induced by crystallographic texture.