Publication detail

Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy

PETRENEC, M. VRASPÍROVÁ, E. NĚMEC, K. HECZKO, M.

Original Title

Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy

Type

journal article - other

Language

English

Original Abstract

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 mm was transformed to fully lamellar structure containing gamma and alpha2 phases having the mean grain size 229 mm. 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.

Keywords

TiAl alloy, cyclic heat treatment, refined cast structure, discontinuous coarsening, microhardness

Authors

PETRENEC, M.; VRASPÍROVÁ, E.; NĚMEC, K.; HECZKO, M.

RIV year

2013

Released

10. 9. 2013

Publisher

Trans Tech Publications

Location

Switzerland

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Year of study

586

Number

9

State

Swiss Confederation

Pages from

222

Pages to

225

Pages count

4

BibTex

@article{BUT108924,
  author="Martin {Petrenec} and Eva {Vraspírová} and Karel {Němec} and Milan {Heczko}",
  title="Effect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy",
  journal="Key Engineering Materials (print)",
  year="2013",
  volume="586",
  number="9",
  pages="222--225",
  doi="10.4028/www.scientific.net/KEM.586.222",
  issn="1013-9826"
}