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Substitutional alloying and deformation modes in high chromium ferritic alloys

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Abstract

The effect of microalloying additions of between 0.05 and 2 wt pct Ni, Ru, Nb, and Ti on the plastic deformation of alloys based on Fe-40 wt pct Cr has been studied. The dislocation sub-structures in the deformed and recovered conditions have been characterized for a series of isothermal annealing cycles. Unalloyed Fe-40Cr deforms at room temperature by mixed twinning and slip. Solute additions modify the operative dislocation configuration. The addition of Ni enhances the propensity for mechanical twinning and raises the cleavage resistance in accordance with the solid-solution softening phenomenon. Ruthenium advances a greater degree of cellularity and promotes restoration of the wrought alloy by recovery. Niobium and titanium act primarily as stabilizing agents for the residual interstitial elements. The formation of a recovered substructure favors the long-range tensile ductility. Enhanced toughness is, however, associated with a reduced degree of cellularity and restricted cross slip.

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Authors and Affiliations

  1. Physical Metallurgy Division, MINTEK, 2125, Randburg, Republic of South Africa

    I. M. Wolff

  2. Department Head, is with the Department of Materials Engineering, University of Cape Town, 7700, Rondebosch, Republic of South Africa

    A. Ball

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  1. I. M. Wolff
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  2. A. Ball
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I.M. WOLFF, formerly with the Department of Materials Engineering, University of Cape Town.

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Wolff, I.M., Ball, A. Substitutional alloying and deformation modes in high chromium ferritic alloys. Metall Trans A 23, 627–638 (1992). https://doi.org/10.1007/BF02801180

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  • DOI: https://doi.org/10.1007/BF02801180

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