Tensile, creep and fracture testing of prospective Fe-Al-based alloys using miniature specimens

0506328 - ÚFM 2020 RIV NL eng J - Journal Article
Dymáček, Petr - Dobeš, Ferdinand - Jirásková, Yvonna - Pizúrová, Naděžda - Friák, Martin
Tensile, creep and fracture testing of prospective Fe-Al-based alloys using miniature specimens.
Theoretical and Applied Fracture Mechanics. Roč. 99, FEB (2019), s. 18-26. ISSN 0167-8442. E-ISSN 1872-7638
R&D Projects: GA ČR(CZ) GA17-22139S; GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : Iron aluminides * Small punch test * Creep * Creep rupture strength
OECD category: Materials engineering
Impact factor: 3.021, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0167844218305019?via%3Dihub

Mechanical properties of prospective Fe-Al- based alloys were investigated using miniature specimens. This enables testing of material from experimental heats that did not allow preparation of standard specimens. Small punch test and mini-tensile test were applied for estimation of the mechanical properties of Fe-22 Al and Fe-22Al-7Ti (at.%) at high temperatures. It is shown that the force applied in the small punch test can be successfully converted into the equivalent applied stress using the empirical formula suggested by the new European standard for small punch testing. The minimum deflection rate can be converted into the minimum creep strain rate as well. The improvement of the latter conversion based on the Monlanan-Grant relationship is proposed. The small punch testing enables evaluation of rupture properties including the creep rupture strength. This can effectively complement previous investigations of Fe-Al-Ti alloys performed predominantly in uniaxial compression. It is shown that a significant increase in creep resistance is achieved by addition of titanium and a two-phase microstructure analogical to that in γ'-strengthened nickel-based superalloys is observed.
Permanent Link: http://hdl.handle.net/11104/0297717