Metallurgical and Materials Transactions A

, Volume 38, Issue 9, pp 2061–2071 | Cite as

Texture and Microstructure at the Surface of an AISI D2 Steel Treated by High Current Pulsed Electron Beam

  • J.X. Zou
  • T. Grosdidier
  • B. Bolle
  • K.M. Zhang
  • C. Dong
Article

Abstract

Surface modifications were investigated for an AISI D2 steel after 25 pulses of high current pulsed electron beam (HCPEB) treatment. In particular, X-ray diffraction (XRD) was used to determine the thickness, nature of phase, and texture in the top surface melted layer. The mechanisms responsible for the structure and texture evolutions were further asserted by scanning electron microscopy (SEM) and electron backscattering diffraction (EBSD) results. Under the action of the beam, the large carbides present in the steel were melted and dissolved so that the top surface rapidly solidified as a 3-μm-thick layer of ultra-fine-grained metastable austenite without any martensite formation. The growth of the γ phase led to an unusual <100> + <110> fiber solidification texture. In addition, Σ3-twin boundaries were observed to bridge, most often, near <110> domains. These features, observed here in a Fe supersaturated and highly undercooled melt, are discussed in light of recent findings on atypical growth in directionally solidified Al-based alloys.[40, 41, 42] Comparatively, the α phase present in the heat-affected zone remained randomly oriented.

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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007

Authors and Affiliations

  • J.X. Zou
    • 1
    • 2
  • T. Grosdidier
    • 1
  • B. Bolle
    • 1
  • K.M. Zhang
    • 2
  • C. Dong
    • 2
    • 3
  1. 1.Laboratoire d’Etude des Textures et Applications aux Matériaux (LETAM, UMR-CNRS 7078)Université Paul Verlaine MetzIle du SaulcyFrance
  2. 2.State Key Laboratory of Materials Modification & School of Materials Science and EngineeringDalian University of TechnologyDalianP.R. China
  3. 3.International Center for Materials PhysicsChinese Academy of SciencesShenyangP.R. China

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