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Crystallography, Morphology, and Martensite Transformation of Prior Austenite in Intercritically Annealed High-Aluminum Steel

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Abstract

The crystallography and morphology of the intercritical austenite phase in two high-aluminum steels annealed at 850 °C were examined on the basis of electron backscattered diffraction analysis, in concert with a novel orientation relationship determination and prior austenite reconstruction algorithm. The formed intercritical austenite predominantly shared a Kurdjumov–Sachs-type semicoherent boundary with at least one of the neighboring intercritical ferrite grains. If the austenite had nucleated at high-energy sites (such as a grain corner or edge), no orientation relationship was usually observed. The growth rate of the austenite grains was observed to be slow, causing phase inequilibrium even after extended annealing times. The small austenite grain size and phase fraction were consequently shown to affect martensite start temperature. Both steels had distinct variant pairing tendencies under the intercritically annealed condition.

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Acknowledgments

This study was supported by the Graduate School CE Tampere, the Walter Ahlström Foundation, KAUTE Foundation, TES Foundation, and the Tampere University of Technology. The authors are grateful to the Advanced Steel Processing and Products Research Center in the Colorado School of Mines for allowing the use of the TA DIL805 dilatometer for these studies. The reconstruction algorithm and associated \(Matlab^{\textregistered }\) script presented here is made freely available and can be obtained on request from the corresponding author or from the web address: https://github.com/nyyssont/parent_austenite_reconstruction.

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Authors and Affiliations

  1. Department of Materials Science, Tampere University of Technology, P.O. Box 589, 33101, Tampere, Finland

    T. Nyyssönen, P. Peura & V.-T. Kuokkala

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  1. T. Nyyssönen
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  2. P. Peura
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  3. V.-T. Kuokkala
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Correspondence to T. Nyyssönen.

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Manuscript submitted February 14, 2018.

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Nyyssönen, T., Peura, P. & Kuokkala, VT. Crystallography, Morphology, and Martensite Transformation of Prior Austenite in Intercritically Annealed High-Aluminum Steel. Metall Mater Trans A 49, 6426–6441 (2018). https://doi.org/10.1007/s11661-018-4904-9

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