The transition from the power-law to the power-law breakdown regimes in thermal creep of Zr1%Nb cladding alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00547496" target="_blank" >RIV/68081723:_____/21:00547496 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.kovmat.sav.sk/article.php?rr=59&cc=5&ss=279" target="_blank" >http://www.kovmat.sav.sk/article.php?rr=59&cc=5&ss=279</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4149/km_2021_5_279" target="_blank" >10.4149/km_2021_5_279</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The transition from the power-law to the power-law breakdown regimes in thermal creep of Zr1%Nb cladding alloys

Popis výsledku v původním jazyce

In the present study, the tensile creep behaviour of three various cladding tubes of the Zr1%Nb alloy has been studied in the α-Zr region at 350◦C, which corresponds to the operational service conditions of the cladding tubes in nuclear light-water reactors. Tensile creep tests under the high constant applied stress region from 150 to 260MPa have been carried out at the transition from the power-law (PL) to the power-law breakdown (PLB) regimes. It was found that all dispersion strengthened Zr1%Nb cladding alloys under investigation reach the PLB regime at values of the compensated applied stress σ/G above approximately 8 × 10−3, where the stress exponent n of the minimum creep rate ˙εm (n = (∂ ln ˙εm/∂ ln σ)T) then dramatically increases from the value of ∼ 6 with increasing stress ratio σ/G. The fact that all experimental results for both the PL and PLB obey the Monkman-Grant relationship supports the idea that the creep mechanism in the PL and PLB does not change qualitatively and indicates a close link between the deformation and fracture processes in both creep regimes under investigation. However, future experiments could be carried out at different testing temperatures within the PLB regime to verify the controversial contemporary views.

Název v anglickém jazyce

The transition from the power-law to the power-law breakdown regimes in thermal creep of Zr1%Nb cladding alloys

Popis výsledku anglicky

In the present study, the tensile creep behaviour of three various cladding tubes of the Zr1%Nb alloy has been studied in the α-Zr region at 350◦C, which corresponds to the operational service conditions of the cladding tubes in nuclear light-water reactors. Tensile creep tests under the high constant applied stress region from 150 to 260MPa have been carried out at the transition from the power-law (PL) to the power-law breakdown (PLB) regimes. It was found that all dispersion strengthened Zr1%Nb cladding alloys under investigation reach the PLB regime at values of the compensated applied stress σ/G above approximately 8 × 10−3, where the stress exponent n of the minimum creep rate ˙εm (n = (∂ ln ˙εm/∂ ln σ)T) then dramatically increases from the value of ∼ 6 with increasing stress ratio σ/G. The fact that all experimental results for both the PL and PLB obey the Monkman-Grant relationship supports the idea that the creep mechanism in the PL and PLB does not change qualitatively and indicates a close link between the deformation and fracture processes in both creep regimes under investigation. However, future experiments could be carried out at different testing temperatures within the PLB regime to verify the controversial contemporary views.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Kovové materiály

ISSN

0023-432X

e-ISSN

1338-4252

Svazek periodika

59

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

11

Strana od-do

279-289

Kód UT WoS článku

000712441500001

EID výsledku v databázi Scopus

2-s2.0-85120607012