Detail publikace

Low cycle fatigue of cast gamma-TiAl based alloys at high temperature

PETRENEC, M. ŠMÍD, M. KRUML, T. OBRTLÍK, K. POLÁK, J.

Originální název

Low cycle fatigue of cast gamma-TiAl based alloys at high temperature

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The low-cycle fatigue properties of cast nearly lamellar TiAl alloys with diverse Nb content at room temperature and 750C were compared. Monotonic tensile curves, cyclic stress-strain curves (CSSC) and combined fatigue life curves were obtained at both temperatures. After cyclic straining the surface relief and the fracture surfaces were observed using scanning electron microscopy. The increase in Nb content significantly improves tensile properties and CSSCs at both temperatures. The combined fatigue life curves especially at 750C are shifted to higher fatigue lives. The effect o Nb content on the tensile and cyclic strength is discussed in relation to the thickness of the lamellae. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks. At both temperatures and materials showed similar crack initiation and propagation behavior. The cracks initiated at surface or in sub-surface region creating smooth flat areas corresponding to the persistent slip bands.

Klíčová slova

Low cycle fatigue; lamellar TiAl alloys; high temperature; PSMs, fracture surface

Autoři

PETRENEC, M.; ŠMÍD, M.; KRUML, T.; OBRTLÍK, K.; POLÁK, J.

Rok RIV

2011

Vydáno

9. 3. 2011

Nakladatel

Trans Tech Publications

Místo

Switzerland

ISSN

1013-9826

Periodikum

Key Engineering Materials (print)

Ročník

452-453

Číslo

3/2011

Stát

Švýcarská konfederace

Strany od

421

Strany do

424

Strany počet

4

BibTex

@article{BUT72484,
  author="Martin {Petrenec} and Miroslav {Šmíd} and Tomáš {Kruml} and Karel {Obrtlík} and Jaroslav {Polák}",
  title="Low cycle fatigue of cast gamma-TiAl based alloys at high temperature",
  journal="Key Engineering Materials (print)",
  year="2011",
  volume="452-453",
  number="3/2011",
  pages="421--424",
  issn="1013-9826"
}