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The transition from the power-law to the power-law breakdown regimes in thermal creep of Zr1%Nb cladding alloys
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SYSNO ASEP 0547496 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The transition from the power-law to the power-law breakdown regimes in thermal creep of Zr1%Nb cladding alloys Author(s) Sklenička, Václav (UFM-A) RID, ORCID
Kuchařová, Květa (UFM-A) RID, ORCID
Kvapilová, Marie (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Dvořák, Jiří (UFM-A) RID, ORCIDNumber of authors 5 Source Title Kovové materiály. - : Ústav fyziky materiálu AV ČR, v. v. i. - : Ústav materiálov a mechaniky strojov SAV. - : Ústav materiálového výskumu SAV. - : Strojnícka fakulta STU - ISSN 0023-432X
Roč. 59, č. 5 (2021), s. 279-289Number of pages 11 s. Language eng - English Country SK - Slovakia Keywords zirconium alloy ; creep testing ; power-law breakdown Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects TH02020477 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) TN01000015 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000712441500001 EID SCOPUS 85120607012 DOI 10.4149/km_2021_5_279 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address http://www.kovmat.sav.sk/article.php?rr=59&cc=5&ss=279
Number of the records: 1