|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Thermodynamic-mechanical Modeling of Deformation-induced Martensitic Transformation Aided by In-situ Magnetic Measurements during Tensile Tests
||Michael Hauser, Marco Wendler, Olena Volkova, Javad Mola
|On-Site Speaker (Planned)
Austenitic Fe-Cr-Mn-Ni-based stainless steels can exhibit excellent combinations of strength and ductility by means of the twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) effects. Due to the pronounced effect of deformation-induced martensitic transformation on the mechanical properties of such steels, it is necessary to determine the onset and the kinetics of martensitic transformation. This was done for Fe-16Cr-6Mn-6Ni-0.03N-0.03C and Fe-19Cr-3Mn-4Ni-0.15N-0.2C austenitic stainless steels by means of in-situ magnetic measurements during tensile tests at various temperatures below the deformation-induced martensite start (Mdy→α') temperature. The temperature dependence of the triggering stress for the martensitic transformation was used to calculate the mechanical energy term which, complementary to the available chemical Gibbs energy term, supplied the critical driving force for the martensitic transformation. Results indicated an anomalous stabilization of austenite against martensitic transformation at cryogenic temperatures which was attributed to the paramagnetic-to-antiferromagnetic transition of austenite in the vicinity of the Néel temperature.
||Planned: Supplemental Proceedings volume