Abstract
Manganese enrichment of austenite during prolonged intercritical annealing was used to produce a family of transformation-induced plasticity (TRIP) steels with varying retained austenite contents. Cold-rolled 0.1C-7.1Mn steel was annealed at incremental temperatures between 848 K and 948 K (575 °C and 675 °C) for 1 week to enrich austenite in manganese. The resulting microstructures are comprised of varying fractions of intercritical ferrite, martensite, and retained austenite. Tensile behavior is dependent on annealing temperature and ranged from a low strain-hardening “flat” curve to high strength and ductility conditions that display positive strain hardening over a range of strain levels. The mechanical stability of austenite was measured using in-situ neutron diffraction and was shown to depend significantly on annealing temperature. Variations in austenite stability between annealing conditions help explain the observed strain hardening behaviors.
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Acknowledgments
The authors gratefully acknowledge the support of the National Science Foundation under Award No. CMMI-0729114 and the sponsors of the Advanced Steel Processing and Products Research Center, an industry/university cooperative research center at the Colorado School of Mines. This work also benefited from use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the Office of Basic Energy Sciences (DOE). Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract No. DE AC5206NA25396. Additionally, the authors acknowledge U.S. Steel for providing the experimental material, D.W. Brown and T.A. Sisneros for their assistance with the neutron experiments, and the 2009 Neutron Scattering School at the Lujan Center for providing the opportunity for one author (Gibbs) to learn about the capabilities of neutron diffraction.
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Gibbs, P.J., De Moor, E., Merwin, M.J. et al. Austenite Stability Effects on Tensile Behavior of Manganese-Enriched-Austenite Transformation-Induced Plasticity Steel. Metall Mater Trans A 42, 3691–3702 (2011). https://doi.org/10.1007/s11661-011-0687-y
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DOI: https://doi.org/10.1007/s11661-011-0687-y