Publication detail
HEAT TREATMENT AND MECHANICAL PROPERTIES OF TiAl ALLOY WITH HIGH Nb CONTENT
PETRENEC, M ZEMANOVÁ, A KRAHULA,K KRUML, T MAN,J
Czech title
Tepelné zpracování a mechanické vlastnosti slitin TiAl s vysokým obsahem Nb
English title
HEAT TREATMENT AND MECHANICAL PROPERTIES OF TiAl ALLOY WITH HIGH Nb CONTENT
Type
conference paper
Language
en
Original abstract
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.
Czech abstract
Vliv plně lamelární morfologie vzniklé tepelným zpracováním intermetalických slitin TiAl. Použití termické anylýzy na stanovení fáze transformační teploty
English abstract
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.
Keywords in Czech
intermetalikum TiAl-8Nb , DTA křivka, kroky ochlazovaní pří tepelném zpracování, plně lamelární mikrostruktura, tlakové zkoušky
Keywords in English
TiAl-8Nb intermetallic, DTA curve, step cooling heat treatments, fully lamellar microstructure, compression tests
Released
17.05.2009
Publisher
Materials Engineering
Location
Žilina
ISBN
978-80-87294-39-0
Book
Materials Engineering, Vol. 16, 2009
Pages from–to
13–18
Pages count
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"
}