Investigation of fracture in Fe3Al-based alloys with vanadium and carbon additions by small punch test

0398614 - ÚFM 2014 RIV DE eng A - Abstrakt
Dobeš, Ferdinand - Dymáček, Petr
Investigation of fracture in Fe3Al-based alloys with vanadium and carbon additions by small punch test.
Intermetallics 2013. Deutsche Gesellschaft für Materialkunde eV, 2013. s. 79.
[Intermetallics 2013. 30.09.2013-04.10.2013, Kloster Banz]
Grant CEP: GA ČR(CZ) GAP108/12/1452
Institucionální podpora: RVO:68081723
Klíčová slova: iron aluminides * small punch test * yield stress
Kód oboru RIV: JG - Hutnictví, kovové materiály

Creep resistance of iron-aluminium-based can be improved by introducing second-phase particles, e. g., by additions of carbon and carbide-forming elements. The presence of carbides may negatively influence the ductility of alloys. In the present study, the effect of vanadium and carbon additions on ductility of Fe3Al-type alloy was investigated. The constant-deflection-rate mode of the small punch test was used to compare fracture properties and their temperature dependence in the alloys with different amounts of carbon. Three main quantities were evaluated: maximum force, fracture deflection and fracture energy. Fractographic observations of ruptured specimens were performed with scanning electron microscope. Temperature dependence of small punch test quantities was related to the microscopic image of the fracture. Equivalent fracture strain was evaluated from both small punch test data and microscopic observation of fractured specimens. The relation between equivalent fracture strain and small punch fracture energy was examined. Fracture toughness was calculated from the equivalent fracture strain using previously proposed equations. Temperature dependence of calculated fracture toughness supports the conclusion that the ductility of investigated alloys is not deteriorated by the presence of carbides.
Trvalý link: http://hdl.handle.net/11104/0226097