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On Factors Affecting the Phase Transformation and Mechanical Properties of Cold-Rolled Transformation-Induced-Plasticity–Aided Steel

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Abstract

Two Mo-Nb microalloyed transformation-induced-plasticity (TRIP) steels, with Al contents of 0.23 and 0.65, were subjected to several hot-rolling conditions designed to generate different ferrite morphologies and grain sizes. These structures were then cold rolled and TRIP annealed under different heat-treatment conditions. To further develop TRIP steel in terms of strength and ductility, stabilizing retained austenite by isothermal bainitic transformation was studied in detail. Microstructure observation and tensile tests were conducted, and volume fractions of retained austenite were measured. It was observed that increasing the aluminum content enhances the transformation rate and increases the total amount of bainite fraction at the expense of retained austenite. The latter effect enhances formability by increasing ductility. Furthermore, it was observed that the hot-rolling schedule, prior to cold rolling and heat treatment, has a decisive effect on structure refinement, which enhances the strength-ductility balance of the final product. To study the transformation behavior, dilatometer testing was conducted under conditions similar to that of the heat treatment. Thermodynamic calculations were used to verify the results.

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Notes

  1. Durferrit GS 540/R2 and Durferrit AS 140 are trademarks of Durferrit GmbH, Mannheim, Germany.

  2. Baehr Dilatometer DIL 805A/D is a trademark of Bähr-Thermoanalyse GmbH, Huellhorst, Germany.

  3. THERMO-CALC is a trademark of Thermo-Calc software AB, Stockholm, Sweden.

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Authors and Affiliations

  1. Institute of Metallurgy, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany

    Mohamed Soliman (Doctor) & Heinz Palkowski (Professor of Metal Forming)

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  1. Mohamed Soliman
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  2. Heinz Palkowski
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Correspondence to Mohamed Soliman.

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Manuscript submitted February 24, 2008.

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Soliman, M., Palkowski, H. On Factors Affecting the Phase Transformation and Mechanical Properties of Cold-Rolled Transformation-Induced-Plasticity–Aided Steel. Metall Mater Trans A 39, 2513–2527 (2008). https://doi.org/10.1007/s11661-008-9594-2

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