Detail publikace

Tepelné zpracování a mechanické vlastnosti slitin TiAl s vysokým obsahem Nb

PETRENEC, M ZEMANOVÁ, A KRAHULA,K KRUML, T MAN,J

Český název

Tepelné zpracování a mechanické vlastnosti slitin TiAl s vysokým obsahem Nb

Anglický název

HEAT TREATMENT AND MECHANICAL PROPERTIES OF TiAl ALLOY WITH HIGH Nb CONTENT

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

en

Originální abstrakt

The influence of the fully lamellar morphology produced by heat treatment on the room temperature mechanical properties of near gamma-Ti-44Al-8Nb intermetallic was investigated. Particularly, the effect of improved microstructural control on compression resistance is demonstrated using the step cooling from the alfa single phase, including combination of furnace cooling and air cooling. The differential thermal analysis was used to determine the phase transformation temperatures as the alfa transus and the eutectic temperature. The heat treatment used, consisting in different cooling from alfa region, remould the as-cast nearly lamellar structure to the fully lamellar uniform structure and decreased the average grain size to the half. The furnace cooling from the alfa region to 1 315 C and the following air cooling result in higher yield stress and lower plasticity due the very thin lamellar thickness and planar grain boundary. While higher plasticity and lower yield stress are obtained using the furnace cooling from the alfa region to 1 200 C and the following air cooling. It is caused by the very thick lamellar spacing and locked grain boundaries.

Český abstrakt

Vliv plně lamelární morfologie vzniklé tepelným zpracováním intermetalických slitin TiAl. Použití termické anylýzy na stanovení fáze transformační teploty

Anglický abstrakt

The influence of the fully lamellar morphology produced by heat treatment on the room temperature mechanical properties of near gamma-Ti-44Al-8Nb intermetallic was investigated. Particularly, the effect of improved microstructural control on compression resistance is demonstrated using the step cooling from the alfa single phase, including combination of furnace cooling and air cooling. The differential thermal analysis was used to determine the phase transformation temperatures as the alfa transus and the eutectic temperature. The heat treatment used, consisting in different cooling from alfa region, remould the as-cast nearly lamellar structure to the fully lamellar uniform structure and decreased the average grain size to the half. The furnace cooling from the alfa region to 1 315 C and the following air cooling result in higher yield stress and lower plasticity due the very thin lamellar thickness and planar grain boundary. While higher plasticity and lower yield stress are obtained using the furnace cooling from the alfa region to 1 200 C and the following air cooling. It is caused by the very thick lamellar spacing and locked grain boundaries.

Klíčová slova česky

intermetalikum TiAl-8Nb , DTA křivka, kroky ochlazovaní pří tepelném zpracování, plně lamelární mikrostruktura, tlakové zkoušky

Klíčová slova anglicky

TiAl-8Nb intermetallic, DTA curve, step cooling heat treatments, fully lamellar microstructure, compression tests

Vydáno

17.05.2009

Nakladatel

Materials Engineering

Místo

Žilina

ISBN

978-80-87294-39-0

Kniha

Materials Engineering, Vol. 16, 2009

Strany od–do

13–18

Počet stran

6

BIBTEX


@inproceedings{BUT108926,
  author="Martin {Petrenec} and Adéla {Zemanová} and Karel {Krahula} and Tomáš {Kruml} and Jiří {Man},
  title="HEAT TREATMENT AND MECHANICAL PROPERTIES OF TiAl ALLOY WITH HIGH Nb CONTENT",
  booktitle="Materials Engineering, Vol. 16, 2009",
  year="2009",
  month="May",
  pages="13--18",
  publisher="Materials Engineering",
  address="Žilina",
  isbn="978-80-87294-39-0"
}