Abstract
Two-stage transformation-induced plasticity (TRIP) behavior characterized by the martensitic transformations, γ → ε → α′, has produced exceptional tensile strengths and work hardening rates in Fe-14 wt pct Mn alloys containing Al and Si. A regular solution model has been developed to accurately calculate ΔG γ → ε for a given TRIP alloy and the calculated driving force is used to determine the M εS temperature. The regular solution model developed here predicted driving forces that corresponded well with reported microstructures and behavior of seven FeMnAlSiC steels from literature when considered in conjunction with nucleating defect critical size and material process history. The role of available nucleating defects of critical size, n*, has been linked to the stacking fault energy necessary to observe the γ → ε transformation and the M εS temperature. The regular solution model provided excellent correlation between calculated M εS temperatures and those measured experimentally in 89 alloys from literature and suggested n* = 4 is the critical size of a nucleating defect in annealed microstructures. Factors affecting the γ → ε transformation and the M εS temperature have been identified as prior austenite grain size, dislocation substructure due to prior deformation, and solute segregation.
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Acknowledgments
This work was supported by the Peaslee Steel Manufacturing Research Center (PSMRC). Companies directly involved in this work include AK Steel, ArcelorMittal, Nucor Steel, and US Steel. The authors gratefully acknowledge Jerry Arnold of AK Steel Corporation for his assistance with Thermo-calc calculations.
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Pisarik, S.T., Van Aken, D.C. Thermodynamic Driving Force of the γ → ε Transformation and Resulting MS Temperature in High-Mn Steels. Metall Mater Trans A 47, 1009–1018 (2016). https://doi.org/10.1007/s11661-015-3265-x
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DOI: https://doi.org/10.1007/s11661-015-3265-x