|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Effects of Annealing Time and Strain Rate on Alloy Partitioning and Mechanical Properties of a Medium-Mn Steel
||Jake Benzing, Aniruddha Dutta, Lutz Morsdorf, Alisson Kwiatkowski da Silva, Dirk Ponge, Jeongho Han, Whitney Poling, Bill Luecke, Dierk Raabe, Jim Wittig
|On-Site Speaker (Planned)
A medium-Mn alloy, (Fe-12Mn-3Al-0.06C) weight %, was designed with Thermo-Calc predictions to balance composition, phase fraction and reverted austenitic stacking fault energy. Two inter-critical annealing times, (0.5 and 8) hr, were chosen for an inter-critical annealing temperature of 585 °C to produce multi-phase ultra-fine-grained microstructures with varying amounts of austenite, (3 to 35) volume %. Phase fraction and alloy partitioning were characterized with x-ray diffraction, electron back-scattered diffraction, energy-dispersive spectroscopy via scanning-transmission electron microscopy [EDS-STEM] and atom probe tomography. Servo-hydraulic tension testing was used to study the effects of strain rate, (10^-4 to 10^2) s^-1, on mechanical properties, which revealed a positive strain-rate sensitivity of yield and ultimate tensile strengths. Adiabatic heating was measured in situ with a thermal camera. Strain in the gage section was measured with digital image correlation at 21000 frames per second. Tensile tests were interrupted at 10^-4 s^-1 to characterize the microstructural evolution with TEM.
||Planned: Supplemental Proceedings volume