Modification of the structural-phase state of ferritic-martensitic steels by pulsed gas plasma flows. Inorganic Materials: Applied Research Volume 4, Issue 5, 2013, Pages 376-384

14 сентября 2018
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Контактные данные автора публикации Yakushin, V.L.a , Khein, A.T.a, Dzhumaev, P.S.a , Isaenkova, M.G.b , Kalin, B.A.a , LeontEva-Smirnova, M.V.a , Naumenko, I.A.a , Perlovich, Y.A.a , PolSkii, V.I.a a National Research Nuclear University MEPhI, Moscow, Russian Federation b Boc
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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.
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