Creep of Fe3Al-based alloys with vanadium and carbon additions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00465419" target="_blank" >RIV/68081723:_____/16:00465419 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/16:10334795

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.intermet.2016.05.004" target="_blank" >http://dx.doi.org/10.1016/j.intermet.2016.05.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.intermet.2016.05.004" target="_blank" >10.1016/j.intermet.2016.05.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Creep of Fe3Al-based alloys with vanadium and carbon additions

Popis výsledku v původním jazyce

Creep experiments were conducted on Fe3Al-based alloys with vanadium and carbon additions in the temperature range from 923 to 1023 K, corresponding to the occurrence of B2 lattice. The alloys contained (in atomic %) (i) 27.0 Al, 1.17 V, and 0.02 C and (ii) 27.0 Al, 1.13 V, and 0.73 C (Fe balance). The alloys were tested in the as-cast state and annealed at 1273 K for 50 h. Creep tests were performed in uniaxial compression at a constant load with stepwise loading. Stress exponents and activation energies for the creep rate were determined. The values of the stress exponent in low-carbon alloy correspond to a fivepower- law creep. The activation energy is greater than the activation enthalpy of diffusion of both Fe and Al in Fe3Al and is substantially greater than the activation enthalpy of diffusion of V in Fe3Al. The creep rate is impeded in the high-carbon alloy by the presence of tiny carbide particles. Consequently, the creep resistance of the high-carbon alloy in the as-cast state is greater, especially for higher temperatures and lower stresses. The carbide particles coarsen during annealing at 1273 K and are unable to obstruct dislocation motion because the mean distance between them is too large. The high-carbon alloy is then creep-weaker due to the reduced amount of vanadium present in the matrix.

Název v anglickém jazyce

Creep of Fe3Al-based alloys with vanadium and carbon additions

Popis výsledku anglicky

Creep experiments were conducted on Fe3Al-based alloys with vanadium and carbon additions in the temperature range from 923 to 1023 K, corresponding to the occurrence of B2 lattice. The alloys contained (in atomic %) (i) 27.0 Al, 1.17 V, and 0.02 C and (ii) 27.0 Al, 1.13 V, and 0.73 C (Fe balance). The alloys were tested in the as-cast state and annealed at 1273 K for 50 h. Creep tests were performed in uniaxial compression at a constant load with stepwise loading. Stress exponents and activation energies for the creep rate were determined. The values of the stress exponent in low-carbon alloy correspond to a fivepower- law creep. The activation energy is greater than the activation enthalpy of diffusion of both Fe and Al in Fe3Al and is substantially greater than the activation enthalpy of diffusion of V in Fe3Al. The creep rate is impeded in the high-carbon alloy by the presence of tiny carbide particles. Consequently, the creep resistance of the high-carbon alloy in the as-cast state is greater, especially for higher temperatures and lower stresses. The carbide particles coarsen during annealing at 1273 K and are unable to obstruct dislocation motion because the mean distance between them is too large. The high-carbon alloy is then creep-weaker due to the reduced amount of vanadium present in the matrix.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP108%2F12%2F1452" target="_blank" >GAP108/12/1452: Optimalizace vysokoteplotních mechanických vlastností aluminidů železa typu Fe3Al s karbidotvornými prvky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Intermetallics

ISSN

0966-9795

e-ISSN

—

Svazek periodika

74

Číslo periodika v rámci svazku

JUL

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

60-64

Kód UT WoS článku

000378449300009

EID výsledku v databázi Scopus

2-s2.0-84971310907