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A Novel Mo and Nb Microalloyed Medium Mn TRIP Steel with Maximal Ultimate Strength and Moderate Ductility

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Abstract

The multi-phase, metastable, and multi-scale (M3) constitution of a novel transformation-induced plasticity (TRIP) steel (Fe-0.17C-6.5Mn-1.1Al-0.22Mo-0.05Nb, wt pct) was designed through thermodynamic calculations combined with experimental analysis. In this study, Mo and Nb microalloying was used to control the fraction of retained austenite and its mechanical stability during tensile deformation and to improve the yield strength. Thermodynamic calculations were developed to determine the critical annealing temperature, at which a large fraction of retained austenite (~38 pct) would be obtained through the effects of solute enrichment. The experimental observation was in good agreement with the predicted results. According to the critical annealing temperature, such an ultrafine (<200 nm) M3, microstructure with optimum mechanical stability was successfully achieved. The results of this work demonstrated the superior performance with improved yield strength of 1020 to 1140 MPa and excellent ductility (>30 pct), as compared with other TRIP steels. Both angle-selective backscatter and electron backscatter diffraction techniques were employed to interpret the transformation from the deformed martensitic laths to the ultrafine austenite and ferrite duplex structure.

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Acknowledgments

This work was supported by grants through the Australian Research Council and Deakin University including the ARC Laureate Fellowship (P.D. Hodgson) and the Alfred Deakin Postdoc Research Fellowship (M.H. Cai). We would like to thank Dr. Hossein Beladi at Deakin University for useful discussions, and Institute of Metal Research (IMR), Chinese Academic of Sciences, for assistance in dilatometer tests.

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Authors and Affiliations

  1. Institute for Frontier Materials, Deakin University, Geelong Waurn Ponds Campus, Geelong, VIC, 3216, Australia

    Minghui Cai (Associate Research Fellow), Qi Chao (Ph.D. Student) & Peter D. Hodgson (Director, Australian Laureate Fellow, Alfred Deakin Professor)

  2. National Engineering Research Center for Silicon Steel, Wuhan Iron and Steel Company, Wuhan, 430081, P.R. China

    Zhun Li (Technician)

Authors
  1. Minghui Cai
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  2. Zhun Li
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  3. Qi Chao
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  4. Peter D. Hodgson
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Correspondence to Minghui Cai.

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Manuscript submitted August 19, 2013.

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Cai, M., Li, Z., Chao, Q. et al. A Novel Mo and Nb Microalloyed Medium Mn TRIP Steel with Maximal Ultimate Strength and Moderate Ductility. Metall Mater Trans A 45, 5624–5634 (2014). https://doi.org/10.1007/s11661-014-2504-x

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  • DOI: https://doi.org/10.1007/s11661-014-2504-x

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