A Mechanism of Deformation of Metals at High Temperatures with Special Reference to the Creep after a Sudden Change in Stress

Abstract

Mechanisms of work hardening and recovery following an abrupt change in stress were discussed on the basis of the behavior of dislocations. It was suggested that there would be a mechanism, which might act as a mechanism of recovery when the applied stress was suddenly decreased, while it might act as a mechanism of hardening when the applied stress was abruptly increased. The effect of this hardening and recovery was analytically expressed using the data of creep tests with sudden change in stress. It was shown that the behavior of mild steel after a sudden change in stress in primary or secondary stage of creep could be predicted well by the authors'theory, using the characteristic functions just and previously determined.