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A 3rd Generation Advanced High-Strength Steel (AHSS) Produced by Dual Stabilization Heat Treatment (DSHT)

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Abstract

A 3rd generation advanced high-strength steel containing, in wt pct, 0.3 C, 4.0 Mn, 1.5 Al, 2.1 Si, and 0.5 Cr has been produced using a dual stabilization heat treatment—a five stage thermal processing schedule compatible with continuous galvanized steel production. In excess of 30 vol pct retained austenite containing at least 0.80 wt pct C was achieved with this alloy, which had tensile strengths up to 1650 MPa and tensile elongations around 20 pct.

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Notes

  1. Before XRD examination and tensile testing, all the heat treated samples had the outer 150 μm decarburized layer of their surfaces removed by etching with an aqueous solution containing 49 pct of 30 pct H2O2 and 2 pct of HF and annealed before testing at 453 K (180 °C) for 1 hour; this annealing was intended to eliminate any hydrogen introduced by the decarburization etching. An early stage of martensite tempering might also been involved during this annealing. In industrial practice involving large scale production of AHSS, decarburization would not be an issue. Furthermore, automotive steels are routinely heated to 453 K (180 °C) during final finishing.

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We acknowledge financial support from the Department of Energy and the NSF CMMI through Grant No. 0727583. The DSHT approach to AHSS was the “brainchild” of our late colleague Gary M. Michal, whose untimely death occurred just weeks before his 59th birthday on 11 May, 2012; he will be sorely missed. Special thanks are extended to AK Steel Research Group for processing the laboratory induction air melted heat 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. Department of Materials Science and Engineering, 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.

Additional information

Manuscript submitted March 13, 2013.

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Qu, H., Michal, G.M. & Heuer, A.H. A 3rd Generation Advanced High-Strength Steel (AHSS) Produced by Dual Stabilization Heat Treatment (DSHT). Metall Mater Trans A 44, 4450–4453 (2013). https://doi.org/10.1007/s11661-013-1871-z

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