Authors: AS Hamada P Sahu S Ghosh Chowdhury LP Karjalainen J Levoska T Oittinen
Publish Date: 2007/12/21
Volume: 39, Issue: 2, Pages: 462-465
Abstract
A highMn Fe26Mn014C austenitic steel was hot deformed at 900 °C 1000 °C and 1100 °C with the strain rate of 5 s−1 followed by air cooling AC or water quenching WQ Deformation at 1100 °C results in the occurrence of dynamic recrystallization DRX that produces a fine grain size ∼10 μm which was found to prevent the γ fcc → ε hcp transformation upon cooling The transformation in the finegrained austenite is insensitive to the defect concentration Isothermal holding of the dynamically recrystallized specimen at 1100 °C for 3 minutes results in grain growth ∼40 μm The coarser grain size was observed to allow the transformation to proceed 17 pct martensite The role of grain boundaries twins and faults in suppressing the phase transformation is discussed
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