Počet záznamů: 1  

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

  1. 1.
    0545824 - ÚFM 2022 RIV CH eng J - Článek v odborném periodiku
    Poloprudský, Jakub - Chlupová, Alice - Šulák, Ivo - Kruml, Tomáš - Hloch, Sergej
    Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet.
    Materials. Roč. 14, č. 18 (2021), č. článku 5212. E-ISSN 1996-1944
    Grant CEP: GA ČR(CZ) GA19-00408S
    Institucionální podpora: RVO:68081723 ; RVO:68145535
    Klíčová slova: initial erosion stage * 316L * Ti6Al4V * eroded surface topography * water volume droplets * dislocation structure
    Obor OECD: Mechanical engineering; Mechanical engineering (UGN-S)
    Impakt faktor: 3.748, rok: 2021
    Způsob publikování: Open access
    https://www.mdpi.com/1996-1944/14/18/5212

    This article deals with the effect of periodically acting liquid droplets on the polished
    surfaces of AISI 316L stainless steel and Ti6Al4V titanium alloy. These materials were exposed to a
    pulsating water jet produced using an ultrasonic sonotrode with an oscillation frequency of 21 kHz
    placed in a pressure chamber. The only variable in the experiments was the time for which the
    materials were exposed to water droplets, i.e., the number of impingements, the other parameters
    were kept constant. We chose a low number of impingements to study the incubation stages of the
    deformation caused by the pulsating water jet. The surfaces of the specimens were studied using
    (1) confocal microscopy for characterizing the surface profile induced by the water jet, (2) scanning
    electron microscopy for detailed surface observation, and (3) transmission electron microscopy for
    detecting the changes in the near-surface microstructure. The surface described by the height of the
    primary profile of the surface increased with the number of impingements, and was substantially
    more intense in the austenitic steel than in the Ti alloy. Irregular surface depressions, slip lines, and
    short cracks were observed in the Ti alloy, whereas pronounced straight slip bands formed in the
    austenitic steel. The dislocation density near the surface was measured quantitatively, reaching high
    values of the order of 1014 m² in the austenitic steel and even higher values (up to 3 1015 m􀀀2) in
    the Ti alloy. The origins of the mentioned surface features differed in the two materials: an intense
    dislocation slip on parallel slip planes for the Ti alloy and mechanical twinning combined with
    dislocation slip for the austenitic steel.
    Trvalý link: http://hdl.handle.net/11104/0322624

     
     
Počet záznamů: 1  

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