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Microstructures and Mechanical Behavior of Fe-18Mn-10Al-(0.8-1.2)C Steels

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Abstract

In the present work, two Fe-18Mn-10Al-xC low-density steels with different C concentrations were investigated. It is revealed that the difference in C concentration resulted in a marked difference in the microstructures of the investigated steels. The microstructure consisted of ferrite and austenite as well as of precipitates in Fe-18Mn-10Al-0.8C (0.8C steel); while carbides distributed on the austenite matrix in Fe-18Mn-10Al-1.2C (1.2C steel) after the same heat treatment. During deformation, dislocations exhibited a typical paired superdislocation feature in ferrite in 0.8C steel, extensive planar glide occurred in austenite in both steels and Taylor lattice-like structures, and well-developed microbands appeared in 1.2C steel. Overall, 0.8C steel demonstrated a tensile strength of 973.6 MPa and elongation of 44%, and 1.2C steel received a lower tensile strength (881.3 MPa) and a much higher elongation (78%). The strain hardening behavior of the two alloys was also different. The strain hardening rate decreased with strain in a non-monotonic feature for 0.8C steel, while it exhibited a moderate inflection in 1.2C steel.

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Acknowledgements

The authors would like to acknowledge help with the TEM work by the research workers at the Research Institute, Northeastern University.

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Authors and Affiliations

  1. Northeastern University, Shenyang, 110819, China

    Hua Ding, Dong Han, Zhihui Cai & Zhiqiang Wu

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  1. Hua Ding
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  2. Dong Han
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  3. Zhihui Cai
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  4. Zhiqiang Wu
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Correspondence to Hua Ding.

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Ding, H., Han, D., Cai, Z. et al. Microstructures and Mechanical Behavior of Fe-18Mn-10Al-(0.8-1.2)C Steels. JOM 66, 1821–1827 (2014). https://doi.org/10.1007/s11837-014-1063-3

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  • DOI: https://doi.org/10.1007/s11837-014-1063-3

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