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Third Generation 0.3C-4.0Mn Advanced High Strength Steels Through a Dual Stabilization Heat Treatment: Austenite Stabilization Through Paraequilibrium Carbon Partitioning

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Abstract

In excess of 30 vol. pct austenite can be retained in 0.3C-4.0Mn steels subjected to a dual stabilization heat treatment (DSHT) schedule—a five stage precisely controlled cooling schedule that is a variant of the quench and partition process. The temperature of the second quench (stage III) in the DSHT process plays an essential role in the retained austenite contents produced at carbon-partitioning temperatures of 723 K or 748 K (450° C or 475 °C) (stage IV). A thermodynamic model successfully predicted the retained austenite contents in heat-treated steels, particularly for a completely austenitized material. The microstructure and mechanical behavior of two heat-treated steels with similar levels of retained austenite (~30 vol. pct) were studied. Optimum properties—tensile strengths up to 1650 MPa and ~20 pct total elongation—were observed in a steel containing 0.3C-4.0Mn-2.1Si, 1.5 Al, and 0.5 Cr.

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Acknowledgments

We acknowledge the joint financial support from the Department of Energy and the NSF CMMI through Grant Number 0727583. The DSHT approach to AHSS was originally formulated by our late colleague Gary M. Michal, whose untimely death occurred just weeks before his 59th birthday on 11 May, 2012. Special thanks are extended to AK Steel Corporation—Research for processing the laboratory induction air-melted heats of steel used for this work.

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Author notes

  1. Hao Qu (Graduate Student, Engineer)

    Present address: Momentive Performance Materials Inc., 22557 W Lunn Rd, Strongsville, OH, 44149, USA

Authors and Affiliations

  1. Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106, USA

    Hao Qu (Graduate Student, Engineer), Gary M. Michal (Professor) & Arthur H. Heuer (Professor)

Authors
  1. Hao Qu
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  2. Gary M. Michal
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  3. Arthur H. Heuer
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Corresponding author

Correspondence to Arthur H. Heuer.

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Manuscript submitted September 29, 2013.

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Qu, H., Michal, G.M. & Heuer, A.H. Third Generation 0.3C-4.0Mn Advanced High Strength Steels Through a Dual Stabilization Heat Treatment: Austenite Stabilization Through Paraequilibrium Carbon Partitioning. Metall Mater Trans A 45, 2741–2749 (2014). https://doi.org/10.1007/s11661-014-2232-2

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