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Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy
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SYSNO ASEP 0397330 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy Author(s) Petrenec, Martin (UFM-A)
Vraspírová, E. (CZ)
Němec, K. (CZ)
Heczko, Milan (UFM-A) ORCIDNumber of authors 4 Source Title Local Mechanical Properties IX. - Zurich : Trans Tech Publications, 2014 / Pešek L. ; Zubko P. - ISSN 1013-9826 - ISBN 978-3-03785-876-9 Pages s. 222-225 Number of pages 4 s. Publication form Print - P Action LMP 2012 International Conference on Local Mechanical Properties /9./ Event date 07.11.2012-09.11.2012 VEvent location Levoča Country SK - Slovakia Event type WRD Language eng - English Country CH - Switzerland Keywords TiAl alloy ; cyclic heat treatment ; refined cast structure ; discontinuous coarsening ; microhardness Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GAP107/11/0704 GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000336633500054 EID SCOPUS 84885788125 DOI 10.4028/www.scientific.net/KEM.586.222 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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