Abstract
Hadfield manganese steel in the single-phase austenitic condition, strain-d in tension, exhibited jerky flow, a negative strain-rate dependence of flow stress and high work hardening rates in the temperature range -25°C to 250°C. The strain rate-temperature regime of jerky flow was determined. The apparent activation energy for the appearance and disappearance of serrations was found to be 104 kJ/mole and 146 kJ/mole respectively. Static strain aging indicates a Snoek-type strengthening mechanism to be operating below 250°C. An apparent activation energy of 138 kJ/mole (33 Kcal/mole) was measured for the increase in O.2% yield stress after aging between 300 and 400°C. Evidence from the present study, together with the effect of manganese on the activity of carbon in austenite and previous internal friction studies of high-manganese steels, leads us to conclude that dynamic strain aging is the principal cause of rapid work hardening in Hadfield steel.
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