Abstract
In-situ high-energy X-ray diffraction and material modeling are used to investigate the strain-rate dependence of the strain-induced martensitic transformation and the stress partitioning between austenite and α′ martensite in a metastable austenitic stainless steel during tensile loading. Moderate changes of the strain rate alter the strain-induced martensitic transformation, with a significantly lower α′ martensite fraction observed at fracture for a strain rate of 10−2 s−1, as compared to 10−3 s−1. This strain-rate sensitivity is attributed to the adiabatic heating of the samples and is found to be well predicted by the combination of an extended Olson–Cohen strain-induced martensite model and finite-element simulations for the evolving temperature distribution in the samples. In addition, the strain-rate sensitivity affects the deformation behavior of the steel. The α′ martensite transformation at high strains provides local strengthening and extends the time to neck formation. This reinforcement is witnessed by a load transfer from austenite to α′ martensite during loading.
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Acknowledgments
The authors acknowledge Advanced Materials Science and Engineering (AMASE) Master Programme student Tao Qian for the work done with material modeling. The work was financially supported by the Swedish Research Council and the Outokumpu Research Foundation. Use of the APS was supported by the United States Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
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Manuscript submitted September 26, 2007.
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Hedström, P., Lindgren, L.E., Almer, J. et al. Load Partitioning and Strain-Induced Martensite Formation during Tensile Loading of a Metastable Austenitic Stainless Steel. Metall Mater Trans A 40, 1039–1048 (2009). https://doi.org/10.1007/s11661-009-9807-3
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DOI: https://doi.org/10.1007/s11661-009-9807-3