Abstract
The strain rate sensitivity of flow stress in iron was studied when the concentration of solute carbon atoms was varied widely, and the following results were obtained.
(1) The strain rate sensitivity of flow stress is governed mainly by the concentration of solute carbon atoms at room temperature.
(2) Hardening due to solute carbon atoms is remarkable in the range of slow strain rates. The flow stress increases with solute carbon content at a rate of 5∼6 kg/mm2/[0.01%C].
(3) The influence of solute carbon atoms on the flow stress decreases when the temperature is low and/or the strain rate is high.
(4) The above feature can be explained in terms of the model which takes into account the Snoek effect due to carbon atoms.
