Mechanisms of crack initiation in ferritic martensitic and austenitic steels in PbBi
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F17%3AN0000080" target="_blank" >RIV/26722445:_____/17:N0000080 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Mechanisms of crack initiation in ferritic martensitic and austenitic steels in PbBi
Original language description
The ferritic martensitic steel T91 is among the candidate materials for internal structural components of future Heavy Liquid Metal cooled reactors. The position of T91 on the list of the candidate materials is now being questioned due to the evidence of its sensitivity to liquid metal embrittlement (LME), mainly in PbBi eutectic. Therefore, a renewed interest is currently focused on austenitic steels, in particular on 1.4970 steel, as there is a lack of evidence of LME for them. The main goal of this work was to provide an insight into crack initiation phenomena in Liquid Metals for the two different steels and the evaluation of possible mechanisms initiating and propagating the cracks. Slow Strain Rate Tensile (SSRT) tests were carried out with flat specimens in PbBi at 300 °C with low oxygen content (about 10-8 wt. %) and, for comparison in air, up to the Ultimate Tensile Stress (UTS) point. Tests were performed with flat tapered specimens, which were meant to create a uniform variation of stress along the gauge length, with the maximum stress concentrated in the smallest area. This specimen geometry can be used for determination of the threshold stress of the crack initiation. The behaviour of the two materials was affected by the environment, as their cracking mode changed in PbBi when compared to the testing in air. Post-tests examinations were carried out with a Scanning Electron Microscope (SEM) equipped with Focused Ion Beam (FIB). The role of oxides formation and microstructure is discussed and correlated to the initiation of cracks. Under these experimental conditions 1.4970 steel was not affected by the environment, as small plastic cracks were observed around the Ti-rich precipitates in both air and PbBi. By contrast T91 steel showed a market tendency to the crack initiation and rapid growth in PbBi.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20305 - Nuclear related engineering; (nuclear physics to be 1.3);
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings Volume 2017-January, 2017
ISBN
978-808729479-6
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
601-606
Publisher name
TANGER Ltd.
Place of publication
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Event location
Brno
Event date
May 24, 2017
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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