Microstructural Evaluation of AISI 321H After Supercritical Water Exposure

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000174" target="_blank" >RIV/26722445:_____/20:N0000174 - isvavai.cz</a>
Result on the web
<a href="https://arhiv.djs.si/proc/nene2020/pdf/NENE2020_1110.pdf" target="_blank" >https://arhiv.djs.si/proc/nene2020/pdf/NENE2020_1110.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Microstructural Evaluation of AISI 321H After Supercritical Water Exposure
Original language description
Heat-resistant stainless steel AISI 321H - 08Ch18N10T is main material used for internal components of nuclear reactors VVER 440 and 1000. New types of Generation IV reactors, specifically Supercritical Water-Cooled Reactor (SCWR) can use some of materials which are already used in Generation II reactors, but corresponding experimental data are still needed. SCWR will operate at a pressure 25 MPa and core temperature from 350 to 625 °C. In that purpose, several cycles to supercritical water at 495 °C and 25 MPa took place in supercritical water loop (SCWL). Duration of each exposure was 550 h, 123 h and 1001 h, it means 1674 h in total. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) with Electron Backscatter Diffraction (EBSD) in combination with X-Ray Diffraction (XRD) and Raman Spectroscopy (RS) were used to evaluate the microstructure of AISI 321H after the exposure to supercritical water. All these methods confirmed a thick non-uniform layer, which consists of magnetite crystals with thickness less than 1µm. Density of crystals increased after the second and third exposure. Crystallography of matrix have not changed after all exposures.
Czech name
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Czech description
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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)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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