Plastic Behavior of Aged Mild Steel

概要

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To examine the anisotropy of aging under the multiaxial stress state in a mild steel, the strain aged tubular specimens were subjected to combined axial load and torsion. In this paper, mainly the effects of prestrain and aging temperature were examined. The increase in the yield stress due to aging was resolved into two components ; the increase in the lower yield point due to the formation of Cottrell atmosphere and the recovery of elastic limit which was associated with precipitation hardening. By the separation of these two sources of hardening, a quantitative evaluation was made as to the aging effect and the elimination of anisotropy. Furthermore, the yield function containing the third stress invariant, proposed by Edelman and Drucker and partly corrected by the authors, was in good agreement with the experimental results. The direction of the plastic increment vector at the end of yield point elongation was shown to be normal to the yield surface.
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