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Inorganic Materials: Applied Research

, Volume 4, Issue 5, pp 376–384 | Cite as

Modification of the structural-phase state of ferritic-martensitic steels by pulsed gas plasma flows

  • V. L. Yakushin
  • Aung Tkhurein Khein
  • P. S. Dzhumaev
  • M. G. Isaenkova
  • B. A. Kalin
  • M. V. Leont’eva-Smirnova
  • I. A. Naumenko
  • Yu. A. Perlovich
  • V. I. Pol’skii
Physico-Chemical Principles of Materials Development

Abstract

The effect of pulsed plasma flow treatment on the structural-phase state (SPS) and the strengthening of near-surface layers of fuel claddings of chromium ferritic-martensitic steels is investigated. The modification of cladding sections is performed by helium and nitrogen plasma flows with a specific power varying in the range of 0.6–5.2 MW/cm2 at a pulse duration of ∼15–20 μs. The number of irradiation pulses N is varied from 2 to 10. It is found that the treatment of claddings by plasma flows with a specific power of ∼1.0 MW/cm2 (N = 2) results in surface melting. The solidification of near-surface layers forms a two-dimensional nanocrystalline structure with a lateral dimension of grains of ∼100 nm. It is revealed that the plasma treatment results in a change in the crystallographic texture of surface layers of claddings, causing the growth of texture component {100} along the radial direction of claddings, and in a decrease in the lattice parameter determined by the orientation of source grains. It is shown that the occurring structural-phase changes result in the surface strengthening of claddings up to 50%, whose degree depends on plasma treatment conditions.

Keywords

chromium steels structural-phase state modification pulsed plasma flows 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • V. L. Yakushin
    • 1
  • Aung Tkhurein Khein
    • 1
  • P. S. Dzhumaev
    • 1
  • M. G. Isaenkova
    • 1
  • B. A. Kalin
    • 1
  • M. V. Leont’eva-Smirnova
    • 1
  • I. A. Naumenko
    • 1
  • Yu. A. Perlovich
    • 1
  • V. I. Pol’skii
    • 1
  1. 1.National Research Nuclear University MEPhIMoscowRussia

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