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On the Low Temperature Strain Aging of Bainite in the TRIP Steel

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Abstract

The aging behavior of a thermomechanically processed Mo-Al-Nb transformation-induced plasticity steel with ultrafine microstructure was investigated using transmission electron microscopy and atom probe tomography (APT). Strain aging at 73 K (200 °C) for 1800 seconds led to a significant bake-hardening response (up to 222 MPa). Moreover, aging for 1800 seconds at room temperature after 4 pct pre-strain also revealed a bake-hardening response (~60 MPa). The experimental results showed the formation of carbon Cottrell atmospheres around dislocations and the formation of carbon clusters/fine carbides in the bainitic ferrite during aging. It is proposed that this is associated with the high dislocation density of bainitic ferrite with formation of a complex dislocation substructure after pre-straining and its high average carbon content (~0.35 at. pct). The segregation of carbon and substitutional elements such as Mn and Mo to the retained austenite/bainitic ferrite interface during aging was observed by APT. This segregation is likely to be the preliminary stage for Mo-C particles’ formation. The aging after pre-straining also induced the decomposition of retained austenite with formation of ferrite and carbides.

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Acknowledgments

The authors would like to acknowledge the technical and scientific support of the Center for Electron Microscopy at Monash University. One of the authors (P.D.H.) also acknowledges the support of the ARC Laureatte Fellowship scheme.

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Authors and Affiliations

  1. Institute for Frontier Materials, GTP Research, Geelong Technology Precinct, Deakin University, Geelong Waurn Ponds Campus, Geelong, VIC, 3217, Australia

    Ilana Timokhina (Senior Research Academic) & Hossein Beladi (Senior Research Academic)

  2. Centre for Electron Microscopy, Monash University, Building 81, Clayton, VIC, 3800, Australia

    Xiang-Yuan Xiong (Senior Research Academic)

  3. Institute for Technology Research and Innovation, Deakin University, Geelong, VIC, 3217, Australia

    Peter D. Hodgson (ARC Laureate Fellow, Alfred Deakin Professor, Director)

Authors
  1. Ilana Timokhina
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  2. Hossein Beladi
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  3. Xiang-Yuan Xiong
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  4. Peter D. Hodgson
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Correspondence to Ilana Timokhina.

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Manuscript submitted February 14, 2013.

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Timokhina, I., Beladi, H., Xiong, XY. et al. On the Low Temperature Strain Aging of Bainite in the TRIP Steel. Metall Mater Trans A 44, 5177–5191 (2013). https://doi.org/10.1007/s11661-013-1864-y

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  • DOI: https://doi.org/10.1007/s11661-013-1864-y

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