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Effect of Austenite Pancaking on the Microstructure, Texture, and Bendability of an Ultrahigh-Strength Strip Steel

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Abstract

The effect of austenite pancaking in the non-recrystallization regime on microstructure and texture evolution and thereby on bendability was investigated in an ultrahigh-strength strip steel with a martensitic-bainitic microstructure. The results indicate that an increase in rolling reduction (R tot) below the non-recrystallization temperature, which improves the strength and toughness properties, increases the intensities of the ~{554}〈225〉 α and ~{112}〈110〉 α texture components along the strip centerline and of the ~{112}〈111〉 α component at the surface region. Even with the highest R tot of 79 pct, the bendability along the rolling direction was good, but the preferred alignment of rod-shaped MA constituents along the rolling direction led to a dramatic decrease in the bendability transverse to the rolling direction, with severe cracking occurring even at small bending angles. The early cracking is attributed to localization of the strain in narrow shear bands. It is concluded that the Rtot value has to be limited to guarantee successful bendability.

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Acknowledgments

Financial support of the Finnish Funding Agency for Technology and Innovation (Tekes) is gratefully acknowledged in the Light and Efficient Solutions Program (LIGHT) of the Finnish Metals and Engineering Competence Cluster Ltd (FIMECC).

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Authors and Affiliations

  1. Department of Mechanical Engineering Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, 90014, Oulu, Finland

    Antti Juhani Kaijalainen (Ph.D. Student) & L. Pentti Karjalainen (Emeritus Professor)

  2. Ruukki Metals Oy Steel Company, Rautaruukintie 155, P.O. Box 93, 92101, Raahe, Finland

    Pasi Suikkanen (Development Manager (Ph.D.)

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

    John J. Jonas (Emeritus Professor)

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  1. Antti Juhani Kaijalainen
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  2. Pasi Suikkanen
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Correspondence to Antti Juhani Kaijalainen.

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Manuscript submitted July 1, 2013.

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Kaijalainen, A.J., Suikkanen, P., Karjalainen, L.P. et al. Effect of Austenite Pancaking on the Microstructure, Texture, and Bendability of an Ultrahigh-Strength Strip Steel. Metall Mater Trans A 45, 1273–1283 (2014). https://doi.org/10.1007/s11661-013-2062-7

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