Abstract
The effects of the partial replacement of Si with Al and the addition of P on the microstructure and mechanical properties of experimental TRIP-aided steels subjected to different thermo-mechanical cycles were studied. Based on the available literature and thermodynamics-based calculations, three steels with different compositions were designed to obtain optimum results from a relatively low number of experiments. Different combinations of microstructure were developed through three different kinds of thermo-mechanical-controlled processing (TMCP) routes, and the corresponding tensile properties were evaluated. The results indicated that partial replacement of Si with Al improved the strength-ductility balance along with providing an improved variation in the incremental change in the strain-hardening exponent. However, the impact of the P addition was found to depend more on the final microstructure obtained by the different TMCP cycles. It has also been shown that an increase in the volume fraction of the retained austenite (\( V_{{\gamma_{\text{ret}} }} \)) or its carbon content (\( C_{{\gamma_{\text{ret}} }} \)) resulted in an improved strength-ductility balance, which can be attributed to better exploitation of the TRIP effect.
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The authors (Ravi Ranjan and Shiv Brat Singh) gratefully acknowledge the support of Ministry of Steel and Department of Science and Technology, Government of India. The work at Deakin University was supported through the Grants provided by the Australian Research Council.
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Manuscript submitted October 7, 2014.
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Ranjan, R., Beladi, H., Singh, S.B. et al. Thermo-mechanical Processing of TRIP-Aided Steels. Metall Mater Trans A 46, 3232–3247 (2015). https://doi.org/10.1007/s11661-015-2885-5
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DOI: https://doi.org/10.1007/s11661-015-2885-5