|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Steels
||Evolution of Austenite Dislocation Density during Hot Deformation using a Physical Dynamic Recrystallization Model
||Peng Zhou, Qingxian Ma
|On-Site Speaker (Planned)
A new model to predict the dislocation density evolution of 30Cr2Ni4MoV steel during hot deformation was proposed in this study. Hot compression of 30Cr2Ni4MoV steel was carried out on Gleeble 1500 at different conditions. The dependence of yield stress, critical stress and strain of dynamic recrystallization and the saturation stress of dynamic recovery, which were identified from the strain hardening rate curves, on temperature and strain rate was determined. Two sets of dislocation density equation were derived from the experimental flow curves: I) a dislocation density relation describing the grains in which dynamic recovery took place only; and II) an average dislocation density expression pertaining to the recrystallized grains. The kinetics model of dynamic recrystallization was determined with the aid of the above relations. Finally, the dependence of the dislocation density on strain, deformation temperature and strain rate was determined and the predicted results agreed well with the experimental results.
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