EFFECTS OF PHOSPHORUS ON THE ANNEALING TEXTURE, PLASTIC ANISOTROPY, AND MECHANICAL PROPERTIES OF LOW-CARBON STEELS.

Abstract

Low-carbon steels containing 0. 11 percent manganese have been studied. Both vacuum-melted and air-melted heats, with phosphorus additions up to 0. 12 percent, were used. With a cold reduction of 80 percent, followed by annealing at temperatures in the range 710 to 820 degree C, the plastic strain ratios r//m and DELTA r, as well as the strength of the steels were substantially improved by phosphorus. Annealing at the intercritical temperatures 780 and 820 degree C further improved the strain ratios. The strong tendency for phosphorus to segregate at the subgrain and grain boundaries played an important role in controlling the formation of annealing textures in these steels.