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Deformation Features of the Propagation of Cleavage Cracks in a Ferritic-Pearlite Microstructure in the Ductile to Brittle Transition Interval

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Abstract

In the paper, the deformation features of the propagation of cleavage cracks in low-alloy low-carbon steel with a ferritic-pearlite microstructure by example of steel 09G2S after hot rolling are investigated. The studied cleavage cracks were obtained in impact bending tests at temperatures in the ductile to brittle transition interval. The study was carried out by transmission electron microscopy, transmission Kikuchi diffraction, and electron backscattered diffraction. It is shown that the deformation accompanying the growth of the cleavage crack in the ferritic-pearlite microstructure is formed when the joints between the cracks propagating in parallel planes break. The crack growth within a single plane occurs without any recorded deformation. The joints are broken by a ductile mechanism according to the scheme of mixed loading by opening and shear. Overlapping of the cleavage cracks determines the relationship between the shear mode and the opening mode during joint deformation, which controls the shape and depth of the plastic deformation zones.

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ACKNOWLEDGMENTS

We express our gratitude to M.A. Shtremel’, Professor of National Research Technological University Moscow Institute of Steel and Alloys (MISiS), Doctor of Physical and Mathematical Sciences, for a detailed discussion of the experimental results.

Funding

The work was carried out within the state task no. 075-00947-20-00.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    M. M. Kantor, V. V. Sudin & K. A. Solncev

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  1. M. M. Kantor
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  2. V. V. Sudin
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  3. K. A. Solncev
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Correspondence to M. M. Kantor.

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Kantor, M.M., Sudin, V.V. & Solncev, K.A. Deformation Features of the Propagation of Cleavage Cracks in a Ferritic-Pearlite Microstructure in the Ductile to Brittle Transition Interval. Inorg Mater 57, 641–653 (2021). https://doi.org/10.1134/S0020168521060042

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