Abstract
We investigated the cause for poor ductility in austenitic Fe-Mn-C steels under a specific condition. Tensile tests were performed on an Fe-17Mn-0.3C steel at 273 K, 294 K, 323 K, 373 K, 423 K, 473 K, and 523 K (0 °C, 21 °C, 50 °C, 100 °C, 150 °C, 200 °C, and 250 °C). Microstructural observations were conducted by optical microscopy, atomic force microscopy, scanning electron microscopy and the X-ray diffraction method. ε-martensitic transformation was concluded to be the major cause for the poor ductility. The cracks were initiated from the annealing twin boundaries that interacted with the ε-martensite.
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Acknowledgments
M.K. acknowledges the Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists. The Materials Manufacturing and Engineering Station and Materials Analysis Station at the National Institute for Materials Science supported this work by producing the samples and carrying out the analysis of the chemical compositions. The authors would also like to acknowledge Dr. Takehiko Kikuchi for taking part in the discussions during the experiments.
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Manuscript submitted November 6, 2011.
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Koyama, M., Sawaguchi, T. & Tsuzaki, K. Premature Fracture Mechanism in an Fe-Mn-C Austenitic Steel. Metall Mater Trans A 43, 4063–4074 (2012). https://doi.org/10.1007/s11661-012-1220-7
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DOI: https://doi.org/10.1007/s11661-012-1220-7