Work hardening, strength, restorative mechanisms, and ductility in the hot working of 300 series stainless steels.

摘要

tress-strain curves, generated through continuous and multistage torsion tests of as-cast and homogenized 301, 304, 316 and 317 ;Static restorative mechanisms were examined by mechanical metallographic methods. Fractional softening was due to both static recovery SRV and static recrystallization SRX. The kinetics were analyzed through use of the Avrami equation. At low strains, the time for 50% SRX was a strong function of strain to the ;Simulation of a cross country mill showed that multistage flow curves increased as strain rate rose and as interval time and T declined, particularly below 1050;Dynamic softening mechanisms were analyzed through examination of the flow curves, with conclusions based upon mechanical data being confirmed by optical metallographic methods. Upon attaining a critical strain, dynamic recrystallization DRX was initiated, producing a peak and then softening to a steady state regime. The rate of dynamic softening was determined by means of the Avrami equation. The critical stress and strain for subgrain formation and for DRX were determined from changes in slope of the strain hardening-flow stress