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Work Hardening Behavior in Steel with Multiple TRIP Mechanisms

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Abstract

Transformation-induced plasticity (TRIP) behavior was studied in steel with the composition Fe-0.07C-2.85Si-15.3Mn-2.4Al-0.017N that exhibited two TRIP mechanisms. The initial microstructure consisted of both ε- and α-martensites with 27 pct retained austenite. TRIP behavior in the first 5 pct strain was predominately austenite transforming to ε-martensite (Stage I), but upon saturation of Stage I, the ε-martensite transformed to α-martensite (Stage II). Alloy segregation also affected the TRIP behavior with alloy-rich regions producing TRIP just prior to necking. This behavior was explained by first-principles calculations which revealed that aluminum significantly affected the stacking fault energy in Fe-Mn-Al-C steels by decreasing the unstable stacking fault energy and promoting easy nucleation of ε-martensite. The addition of aluminum also raised the intrinsic stacking fault energy and caused the ε-martensite to be unstable and transform to α-martensite under further deformation. The two-stage TRIP behavior produced a high strain hardening exponent of 1.4 and led to an ultimate tensile strength of 1165 MPa and elongation to failure of 35 pct.

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Acknowledgments

This work was supported in part by the National Science Foundation (NSF) and the Department of Energy under contract CMMI 0726888. The authors gratefully acknowledge the support of the Graduate Center for Materials Research and in particular Dr. Eric Bohannen for help with X-ray diffraction. Meghan McGrath was supported by a Department of Education GAANN fellowship under contract P200A0900048.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Missouri University of Science and Technology, Rolla, MO, USA

    M. C. McGrath (Former Graduate Student) & D. C. Van Aken (Curator’s Professor)

  2. Institute of Solid State Chemistry, Yekaterinburg, Russia

    N. I. Medvedeva (Principal Research Scientist)

  3. Department of Physics, Missouri University of Science and Technology, Rolla, MO, USA

    J. E. Medvedeva (Associate Professor)

Authors
  1. M. C. McGrath
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  2. D. C. Van Aken
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  3. N. I. Medvedeva
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  4. J. E. Medvedeva
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Corresponding author

Correspondence to D. C. Van Aken.

Additional information

Manuscript submitted August 3, 2012.

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McGrath, M.C., Van Aken, D.C., Medvedeva, N.I. et al. Work Hardening Behavior in Steel with Multiple TRIP Mechanisms. Metall Mater Trans A 44, 4634–4643 (2013). https://doi.org/10.1007/s11661-013-1820-x

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