Abstract

Using the yield point return technique the strain aging kinetics of annealed Ferrovac E iron (0.01% C, 0.0002% N) has been studied in the temperature range of 0° to 100° C. Aging was performed while the specimen was subjected to tensile stress. A two-stage aging process was observed at and below 31°C. The first stage attributed to Snoek-Schoeck-Seeger rearrangement of interstitials about dislocations was investigated in detail. For this stage the following has been found: (a) a t 2 3 relationship is obeyed, (b) the yield point return data agree with interstitial jump time, (c) the maximum value of the yield stress increment is a constant of 0.7 ± 0.1 kg/mm 2 and is independent of time and temperature, (d) positive intercepts at zero aging time are observed, and (e) there is close agreement between the activation energies determined by Hartley analysis (14.5 kcal/mole) and Arrhenius equation (15.5 kcal/mole). The second stage is ascribed to conventional interstitial bulk diffusion.

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