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X-Ray Diffraction Study on the Strain Anisotropy and Dislocation Structure of Deformed Lath Martensite

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Abstract

18Ni (300) maraging steel possessing lath martensite structure was deformed by four passes of equal-channel angular pressing (ECAP) at ambient temperature. Line profile analysis (LPA) of X-ray diffraction (XRD) patterns identified strong strain anisotropy and remarkable increases in the relative fraction of screw dislocations after ECAP. The strain anisotropy was reasonably accounted for by the anisotropy of elastic constants. Domination of screw dislocations in the deformed structure was attributed to the preferred annihilation of edge dislocations in the early stages of deformation along with the difficulties for annihilation of screw dislocations by cross slipping. Cobalt addition was mainly assumed to make cross slipping difficult by reducing stacking-fault energy and favoring short-range ordering.

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Author notes

  1. F. Hosseini Nasab (Doctoral Student)

    Present address: Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran

Authors and Affiliations

  1. Faculty of Materials Engineering, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran

    S. Hossein Nedjad (Associate Professor), M. R. Movaghar Garabagh (Doctoral Student) & S. R. Damadi (Doctoral Student)

  2. Faculty of Materials Engineering, Sahand University of Technology, Tehran, Iran

    F. Hosseini Nasab (Doctoral Student)

  3. School of Metallurgy and Materials Engineering, University of Tehran, P.O. Box: 14395-731, Tehran, Iran

    M. Nili Ahmadabadi (Professor)

Authors
  1. S. Hossein Nedjad
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  2. F. Hosseini Nasab
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  3. M. R. Movaghar Garabagh
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  4. S. R. Damadi
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  5. M. Nili Ahmadabadi
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Correspondence to S. Hossein Nedjad.

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Manuscript submitted June 19, 2010.

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Hossein Nedjad, S., Hosseini Nasab, F., Movaghar Garabagh, M.R. et al. X-Ray Diffraction Study on the Strain Anisotropy and Dislocation Structure of Deformed Lath Martensite. Metall Mater Trans A 42, 2493–2497 (2011). https://doi.org/10.1007/s11661-011-0620-4

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  • DOI: https://doi.org/10.1007/s11661-011-0620-4

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