Environmentally assisted cracking of T91 ferritic-martensitic steel in heavy liquid metals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000031" target="_blank" >RIV/26722445:_____/20:N0000031 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.degruyter.com/view/journals/corrrev/38/2/article-p183.xml?tab_body=pdf-69320" target="_blank" >https://www.degruyter.com/view/journals/corrrev/38/2/article-p183.xml?tab_body=pdf-69320</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/corrrev-2019-0035" target="_blank" >10.1515/corrrev-2019-0035</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Environmentally assisted cracking of T91 ferritic-martensitic steel in heavy liquid metals

Popis výsledku v původním jazyce

In order to advance material development for future nuclear systems, an insight into the cracking conditions of T91 ferritic-martensitic steel in heavy liquid metals (IILM) is provided. The paper critically reviews previous experimental data and summarizes them with new results. The new testing of T91 steel was performed in contact with slow flow and static HLM to study crack initiation, especially in liquid PbBi eutectic at 300 degrees-350 degrees C and Pb at 400 degrees C with about 1 x 10(-6) wt.% of oxygen. Pre-stressed coupons were exposed to the liquid metals for up to 2000 h. Constant extension rate tests (CERTs) were performed in the liquid metals to accelerate cracking development. Under static conditions, the testing resulted in oxidation without any crack observation. Under the CERT ones, the T91 steel showed a tendency to crack initiation in PbBi, while in Pb, cracks were not initiated even when the oxide layer was broken. Moreover, the environmentally assisted crack initiated at the maximum load and continued to grow under further loading without unstable failure. Both previous and new data have confirmed that high stress and plastic strain are pre-conditions for the environmentally assisted cracking of 191 in static HLM. It indicates that in the systems utilizing continuous oxygen control of HLM, the LME/EAC of the T91 could develop only in the beyond design load conditions. Further testing is necessary to address the HLM flow speed effect.

Název v anglickém jazyce

Environmentally assisted cracking of T91 ferritic-martensitic steel in heavy liquid metals

Popis výsledku anglicky

In order to advance material development for future nuclear systems, an insight into the cracking conditions of T91 ferritic-martensitic steel in heavy liquid metals (IILM) is provided. The paper critically reviews previous experimental data and summarizes them with new results. The new testing of T91 steel was performed in contact with slow flow and static HLM to study crack initiation, especially in liquid PbBi eutectic at 300 degrees-350 degrees C and Pb at 400 degrees C with about 1 x 10(-6) wt.% of oxygen. Pre-stressed coupons were exposed to the liquid metals for up to 2000 h. Constant extension rate tests (CERTs) were performed in the liquid metals to accelerate cracking development. Under static conditions, the testing resulted in oxidation without any crack observation. Under the CERT ones, the T91 steel showed a tendency to crack initiation in PbBi, while in Pb, cracks were not initiated even when the oxide layer was broken. Moreover, the environmentally assisted crack initiated at the maximum load and continued to grow under further loading without unstable failure. Both previous and new data have confirmed that high stress and plastic strain are pre-conditions for the environmentally assisted cracking of 191 in static HLM. It indicates that in the systems utilizing continuous oxygen control of HLM, the LME/EAC of the T91 could develop only in the beyond design load conditions. Further testing is necessary to address the HLM flow speed effect.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA16-15008S" target="_blank" >GA16-15008S: Kinetika a mechanismus iniciace trhliny vlivem praskání v tekutém kovu</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Corrosion Reviews

ISSN

0334-6005

e-ISSN

2191-0316

Svazek periodika

38

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

183-194

Kód UT WoS článku

000521509400007

EID výsledku v databázi Scopus

2-s2.0-85079065098