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Formation of Widmanstätten Austenite in Strip Cast Grain-Oriented Silicon Steel

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Abstract

The formation of Widmanstätten austenite was studied in strip cast grain-oriented silicon steel. The microstructure was investigated by optical microscopy and scanning electron microscopy. The orientations of the ferrite, Widmanstätten austenite, and martensite were determined using electron backscatter diffraction. The Widmanstätten austenite exhibits a lath-like shape and nucleates directly on the ferrite grain boundaries. This differs significantly from earlier work on duplex stainless steels. The orientation relationship between the Widmanstätten austenite and the parent ferrite is closer to Kurdjumov–Sachs than to Nishiyama–Wassermann. The ferrite boundaries migrate so as to accommodate the habit planes of the laths, leading to the presence of zigzag boundaries in the as-cast strip. Carbon partitioning into the Widmanstätten austenite and silicon partitioning into the parent ferrite were observed.

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Acknowledgments

The authors gratefully acknowledge the financial support received from the National Natural Science Foundation of China (Grant Nos. 50734001, 51004035, 51374002, 51574078), the National Key Technology R&D Program (Grant No. 2012BAE03B00), the National High Technology R&D “863” Program (Grant No. 2012AA03A506), the National Key Research and Development Program of China (Grant No. 2016YFB0300305), and the Fundamental Research Funds for the Central Universities (Grant No. N140705001). John J. Jonas is indebted to the Natural Sciences and Engineering Research Council of Canada for financial support. Hongyu Song is grateful to the Chinese Scholarship Council (CSC) (No. 201506080039) for scholarship support. The authors would like to thank Dr. Youliang He from Canmet MATERIALS of Natural Resources Canada for his help with the representation of the orientation relationships.

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, People’s Republic of China

    Hong-Yu Song, Hai-Tao Liu & Guo-Dong Wang

  2. Materials Engineering Department, McGill University, 3610 University Street, Montreal, QC, H3A 2B2, Canada

    John J. Jonas

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  1. Hong-Yu Song
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  2. Hai-Tao Liu
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  3. Guo-Dong Wang
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  4. John J. Jonas
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Correspondence to Hai-Tao Liu.

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Manuscript submitted April 29, 2016.

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Song, HY., Liu, HT., Wang, GD. et al. Formation of Widmanstätten Austenite in Strip Cast Grain-Oriented Silicon Steel. Metall Mater Trans A 48, 1959–1968 (2017). https://doi.org/10.1007/s11661-017-3975-3

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  • DOI: https://doi.org/10.1007/s11661-017-3975-3

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