Abstract
A study has been done of the strain hardening of 304 stainless steel during low temperature creep. Hardening is measured by additional loading (above the creep stress) after various creep times. Both the level and the shape of the strain versus stress curve are altered by creep; higher creep strain is linked to a higher offset yield stress and to a longer inelastic transient during the early stages of deformation during reloading. A theory is described in which the mobile dislocation density is determined by a competition between stress rate dependent injection and velocity dependent trapping. This theory predicts both the creep curve and the hardening effects of creep with good quantitative accuracy.
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