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Phase Transformation Behavior of Medium Manganese Steels with 3 Wt Pct Aluminum and 3 Wt Pct Silicon During Intercritical Annealing

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Abstract

Medium manganese steels alloyed with sufficient aluminum and silicon amounts contain high fractions of retained austenite adjustable to various transformation-induced plasticity/twinning-induced plasticity effects, in addition to a reduced density suitable for lightweight vehicle body-in-white assemblies. Two hot rolled medium manganese steels containing 3 wt pct aluminum and 3 wt pct silicon were subjected to different annealing treatments in the present study. The evolution of the microstructure in terms of austenite transformation upon reheating and the subsequent austenite decomposition during quenching was investigated. Manganese content of the steels prevailed the microstructural response. The microstructure of the leaner alloy with 7 wt pct Mn (7Mn) was substantially influenced by the annealing temperature, including the variation of phase constituents, the morphology and composition of intercritical austenite, the Ms temperature and the retained austenite fraction. In contrast, the richer variant 10 wt pct Mn steel (10Mn) exhibited a substantially stable ferrite-austenite duplex phase microstructure containing a fixed amount of retained austenite which was found to be independent of the variations of intercritical annealing temperature. Austenite formation from hot band ferrite-pearlite/bainite mixtures was very rapid during annealing at 1273 K (1000 °C), regardless of Mn contents. Austenite growth was believed to be controlled at early stages by carbon diffusion following pearlite/bainite dissolution. The redistribution of Mn in ferrite and particularly in austenite at later stages was too subtle to result in a measureable change in austenite fraction. Further, the hot band microstructure of both steels contained a large fraction of coarse-grained δ-ferrite, which remained almost unchanged during intercritical annealing. A recently developed thermodynamic database was evaluated using the experimental data. The new database achieved a better agreement with the experimental results for the 7Mn steel compared with the existing commercial TCFE database; however, some discrepancy in the predicted phase fractions and compositions still existed. The phase transformation behavior of the two steels during annealing and its implication on the design of high aluminum-silicon medium manganese steels were discussed in detail.

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Acknowledgments

The authors gratefully acknowledge Dr. B. Hallstedt from Institute for Materials Applications in Mechanical Engineering (IWM), RWTH Aachen University, for providing the modified thermodynamic database. One of the authors (Binhan Sun) is grateful to the China Scholarship Council (CSC) and the McGill Engineering Doctoral Award (MEDA) program for granting a period of scholarship support.

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Authors and Affiliations

  1. Department of Materials Engineering, McGill University, 3610 University St., Montreal, QC, H3A 0C5, Canada

    Binhan Sun (Graduate Student) & Stephen Yue (Professor)

  2. CanmetMATERIALS, Natural Resources Canada, 183 Longwood Rd S, Hamilton, ON, L8P 0A5, Canada

    Fateh Fazeli (Research Scientist) & Colin Scott (Research Scientist)

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  1. Binhan Sun
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  2. Fateh Fazeli
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Correspondence to Binhan Sun.

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Manuscript submitted February 11, 2016.

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Sun, B., Fazeli, F., Scott, C. et al. Phase Transformation Behavior of Medium Manganese Steels with 3 Wt Pct Aluminum and 3 Wt Pct Silicon During Intercritical Annealing. Metall Mater Trans A 47, 4869–4882 (2016). https://doi.org/10.1007/s11661-016-3678-1

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