Počet záznamů: 1  

Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy

  1. 1.
    0397330 - ÚFM 2015 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
    Petrenec, Martin - Vraspírová, E. - Němec, K. - Heczko, Milan
    Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy.
    Local Mechanical Properties IX. Zurich: Trans Tech Publications, 2014 - (Pešek, L.; Zubko, P.), s. 222-225. Key Engineering Materials, 586. ISBN 978-3-03785-876-9. ISSN 1013-9826.
    [LMP 2012 International Conference on Local Mechanical Properties /9./. Levoča (SK), 07.11.2012-09.11.2012]
    Grant CEP: GA ČR(CZ) GAP107/11/0704
    Institucionální podpora: RVO:68081723
    Klíčová slova: TiAl alloy * cyclic heat treatment * refined cast structure * discontinuous coarsening * microhardness
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika

    The subject of the article is focused on the refining of the cast structure of gamma TiAl-2Nb alloy using cyclic heat treatment and on the analysis of the grain refining mechanism. Microstructure evolution after applied cycles of heat treatment was characterized using light, laser and electron microscopy and using microhardness tests. Application of five heat treatment cycles during which two phase transformations (eutectoid and alpha-recrystallization reactions) repeatedly took place resulted in refining of the cast columnar structure. The mean grain-lamellar colony size 512 micrometers was transformed to fully lamellar structure containing gamma and alpha2 phases having the mean grain size 229 micrometers. Lamellae thickness of gamma was not changed while the thickness of alpha2 phase decreased to 78 nm. Refining of alpha2 phase resulted in the increase of the microhardness by 20 %. The recrystallized cast structure obtained by cyclic heat treatment and the knowledge on the mechanisms of the refining the structure were compared and discussed with the literature data.
    Trvalý link: http://hdl.handle.net/11104/0225975

     
     
Počet záznamů: 1  

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