A Composite Modeling Analysis of the Deformation Behavior of Medium Manganese Steels
- CSM/ASP PRC
- LANL
- CSM/ASPPRC
The deformation behavior of medium manganese steels was evaluated with uniaxial ten-sile testing and the results were correlated with predictions of a composite model shown previously to provide design insight into the development of multi-phase steels with third-generation advanced high strength steel (3GAHSS) properties. An equilibrium thermodynamic-based methodology to design microstructures containing systematic amounts of metastable austenite with controlled stability against trans-formation is presented. The analysis is based on Mn enrichment of austenite during intercritical annealing of medium Mn (7 and 10 wt pct.) low carbon (0.1 and 0.15 wt pct) steels. The steels were produced as laboratory heats that were hot and cold rolled prior to annealing. After annealing the microstructures consisted primarily of either a matrix of fine grained ferrite with austenite contents between 32.6 and 45.2 wt pct (7Mn, 0.1C steels) or a matrix of martensite with various amounts of austenite in the higher Mn steel. The different intercritical annealing conditions produced steels with wide variations in austenite contents and austenite compositions (Mn and C contents) resulting in steels with significant variations in austenite stability. Pre-dictions based on the composite analysis with different assumed flow behaviors for the individual constituents and stability functions for the meta- stable austenite are presented and shown to accurately predict strength-ductility combinations over a range of austenite volume fractions for the 7Mn steel. Applicability of the composite analysis is extended to consider the deformation behavior of the 10Mn steel and evaluate other possible microstructural combinations leading to 3GAHSS properties.
- Research Organization:
- United States Automotive Materials Partnership LLC (USAMP LLC)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Contributing Organization:
- Colorado School of Mines/Advanced Steel Processing and Products Research Center Los Alamos National Laboratory
- DOE Contract Number:
- EE0005976
- OSTI ID:
- 1337168
- Report Number(s):
- DOE-USAMP-05976-1
- Resource Relation:
- Journal Volume: 86; Journal Issue: 10; Conference: August 31 to Sept 4, 2014 2nd International Conference High Manganese Steel 2014 Aachen - Germany
- Country of Publication:
- United States
- Language:
- English
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