Effect of Dislocation Distribution on the Yield Stress in Ferritic Steel Under Identical Dislocation Density Conditions

Abstract

Yield stresses of ferritic iron pre-deformed at 298K and 213K were compared under an identical dislocation density. The specimens pre-deformed at 213K introduced uniformly distributed dislocations, while those at 298K formed dislocation cell structure. After the pre-deformation, tensile tests and stress-relaxation tests were performed at room temperature. The specimens with uniformly distributed dislocations exhibited significantly lower yield stress and larger stress-relaxation than those with cell-structured dislocations even under almost same dislocation density. This result suggests that the uniformly distributed dislocations contain a large amount of mobile dislocations which can easily move at a low stress compared with the cell-structured dislocations.