A research into positron annihilation of the B₂F steel rolled out in step‐s with constant stretch

Abstract

The rolling out of step-s with constant stretch (PV-E) is a new technology developed for rolling steel in recent years. We studied the B2F steel rolled by the new technology with the aid of the positron annihilation technique. The relationships of the average lifetime of positron annihilation with the rolling pressures, the ratio of rolIing speed and the mechanical properties are obtained. The value of the lifetime sliows that there are many dislocations and vacancy clusters in B,F steel after being rolled, and which are supported by observations with a transmission electronmicroscope.