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Effect of Large Shear Deformations on the Fracture Behavior of a Fully Pearlitic Steel

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Abstract

High-pressure torsion (HPT) has been used for investigating the influence of predeformation on the fracture toughness of a fully pearlitic rail steel. The use of HPT enables one to investigate changes in fracture toughness as a function of predeformation over a wide range of strain while simultaneously studying the influence of the crack plane orientation on the fracture toughness. With increasing prestrain, besides a strong increase in hardness, a pronounced anisotropy in the fracture toughness was found. Both the increase in hardness and the anisotropic fracture behavior can be attributed to the shear deformation process leading to an anisotropic composite structure on the nanometer scale.

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Acknowledgments

This work was supported by the Austrian Science Fund FWF in the framework of Research Network S 10402 N16 and the Christian Doppler Society.

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Authors and Affiliations

  1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700, Leoben, Austria

    A. Hohenwarter (Post-Doc), A. Taylor (PhD Student) & R. Pippan (Senior Researcher and Vice Director)

  2. CD-Laboratory for Local Analysis of Deformation and Fracture, A-8700, Leoben, Austria

    A. Hohenwarter (Post-Doc) & R. Pippan (Senior Researcher and Vice Director)

  3. voestalpine Schienen GmbH, A-8700, Leoben, Austria

    R. Stock (Staff Researcher)

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  1. A. Hohenwarter
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  2. A. Taylor
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  3. R. Stock
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  4. R. Pippan
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Correspondence to A. Hohenwarter.

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Manuscript submitted December 21, 2009.

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Hohenwarter, A., Taylor, A., Stock, R. et al. Effect of Large Shear Deformations on the Fracture Behavior of a Fully Pearlitic Steel. Metall Mater Trans A 42, 1609–1618 (2011). https://doi.org/10.1007/s11661-010-0541-7

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