Počet záznamů: 1  

Influence of Cold-Sprayed, Warm-Sprayed, and Plasma-Sprayed Layers Deposition on Fatigue Properties of Steel Specimens

  1. 1.
    0450395 - UFM-A 2016 RIV US eng J - Článek v odborném periodiku
    Čížek, J. - Matejková, M. - Dlouhý, I. - Šiška, Filip - Kay, C.M. - Karthikeyan, J. - Kuroda, S. - Kovařík, O. - Siegl, J. - Loke, K. - Khor, K.A.
    Influence of Cold-Sprayed, Warm-Sprayed, and Plasma-Sprayed Layers Deposition on Fatigue Properties of Steel Specimens.
    Journal of Thermal Spray Technology. Roč. 24, č. 5 (2015), s. 758-768. ISSN 1059-9630
    Institucionální podpora: RVO:68081723
    Klíčová slova: Cold spray * Fatigue * Grit-blast
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Impakt faktor: 1.568, rok: 2015

    Titanium powder was deposited onto steel specimens using four thermal spray technologies: plasma spray, low-pressure cold spray, portable cold spray, and warm spray. The specimens were then subjected to strain-controlled cyclic bending test in a dedicated in-house built device. The crack propagation was monitored by observing the changes in the resonance frequency of the samples. For each series, the number of cycles corresponding to a pre-defined specimen cross-section damage was used as a performance indicator. It was found that the grit-blasting procedure did not alter the fatigue properties of the steel specimens (1% increase as compared to as-received set), while the deposition of coatings via all four thermal spray technologies significantly increased the measured fatigue lives. The three high-velocity technologies led to an increase of relative lives to 234% (low-pressure cold spray), 210% (portable cold spray), and 355% (warm spray) and the deposition using plasma spray led to an increase of relative lives to 303%. The observed increase of high-velocity technologies (cold and warm spray) could be attributed to a combination of homogeneous fatigue-resistant coatings and induction of peening stresses into the substrates via the impingement of the high-kinetic energy particles. Given the intrinsic character of the plasma jet (low-velocity impact of semi/molten particles) and the mostly ceramic character of the coating (oxides, nitrides), a hypothesis based on non-linear coatings behavior is provided in the paper.
    Trvalý link: http://hdl.handle.net/11104/0251766