✍ Scribed by Y Bergstrom; W Roberts
No coin nor oath required. For personal study only.
In this work the conclusions reached in two previous publications on the dynamic strain ageing of polycrystalline u-iron, are confirmed through a study of some solute content and strain rate effects in the so-called jerky-flow region i.e. the lower temperatures of that range over which stress-strain curves are serrated. The contention that jerky flow is chanmterised by locking of immobile dislocations with a concomitant decrease in the probabilitv for remobilization, is adopted 8nd an expression relating the reduction in this probability to (inter Q.&U) strain rate, temperature and solute content is deduced. The equation predicts a behaviour in excellent agreement with experiment and is quite compatible with our earlier more rigorous treatment of the jerky-flow domain. For one of the materials studied, the theory is not obeyed at very low strain rates, this deviation is tentatively expleined in terms of a concentration of dissolved interstitial.3 which is temperature dependent.
VIEILLISSEMENT DYNAMIQUE SOUS DEFORMATION DU FER a: INFLUENCE
📜 SIMILAR VOLUMES
Still unresolved is the question regarding the mechanism which controls the velocity of free dislocations in b.c.c. metals and is thus responsible for the strong temperature dependence of the yield and flow stress. Three mechanisms have been proposed : 1. Overcoming the Peierls-Nabarro force.(31435)