Low cycle thermomechanica lfatigue of reactor steels: Microstructural and fractographic investigations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F15%3A%230000614" target="_blank" >RIV/47718684:_____/15:#0000614 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2015.05.093" target="_blank" >http://dx.doi.org/10.1016/j.msea.2015.05.093</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2015.05.093" target="_blank" >10.1016/j.msea.2015.05.093</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Low cycle thermomechanica lfatigue of reactor steels: Microstructural and fractographic investigations

Popis výsledku v původním jazyce

The fatigue life of the structural materials 15Ch2MFA (CrMoV-alloyed ferritic steel) and 08Ch18N10T (CrNi-alloyed austenitic steel) of aVVER-440 reactor pressure vessel were investigated under fully reversed total strain controlled low cycle fatigue tests. The measurements were carried out in isothermal conditions at 260 °C and with thermal-mechanical conditions in the range 150–270 °C using a GLEEBLE-3800 servo-hydraulic thermal-mechanical simulator. The low cycle fatigue results were evaluated with the Coffin–Manson law, and the parameters of the Ramberg–Osgood stress–strain relation were investigated. Fracture mechanics behavior was observed using scanning electron microscopic analysis of the crack shapes and fracture surfaces. Crack propagation was assessed in relation to the actual crack size and the loading level. Interrupted fatigue tests were also carried out to investigate the kinetics of the fatigue evolution of thematerials. Microstructural evaluation of the samples was performed using light, scanning and transmission electron microscopy as well as X-ray diffraction, and measurement of dislocations was completed using TEM and XRD. The course of dislocation density in relation to cumulative usage factor was similar for both steels. However, the nature and distribution of dislocations were different in the individual steels and this resulted in different mechanical behaviors. The nature of the fracture surfaces of both steels appeared similar despite differences in dislocation arrangement. The distances between striation lines initially increased within creasing crack length and then became saturated. The low cycle fatigue behavior investigated can provide a reference for the remaining life assessment and life time extension analysis of nuclear power plant components. http://dx.doi.org/10.1016/j.msea.2015.05.093

Název v anglickém jazyce

Low cycle thermomechanica lfatigue of reactor steels: Microstructural and fractographic investigations

Popis výsledku anglicky

The fatigue life of the structural materials 15Ch2MFA (CrMoV-alloyed ferritic steel) and 08Ch18N10T (CrNi-alloyed austenitic steel) of aVVER-440 reactor pressure vessel were investigated under fully reversed total strain controlled low cycle fatigue tests. The measurements were carried out in isothermal conditions at 260 °C and with thermal-mechanical conditions in the range 150–270 °C using a GLEEBLE-3800 servo-hydraulic thermal-mechanical simulator. The low cycle fatigue results were evaluated with the Coffin–Manson law, and the parameters of the Ramberg–Osgood stress–strain relation were investigated. Fracture mechanics behavior was observed using scanning electron microscopic analysis of the crack shapes and fracture surfaces. Crack propagation was assessed in relation to the actual crack size and the loading level. Interrupted fatigue tests were also carried out to investigate the kinetics of the fatigue evolution of thematerials. Microstructural evaluation of the samples was performed using light, scanning and transmission electron microscopy as well as X-ray diffraction, and measurement of dislocations was completed using TEM and XRD. The course of dislocation density in relation to cumulative usage factor was similar for both steels. However, the nature and distribution of dislocations were different in the individual steels and this resulted in different mechanical behaviors. The nature of the fracture surfaces of both steels appeared similar despite differences in dislocation arrangement. The distances between striation lines initially increased within creasing crack length and then became saturated. The low cycle fatigue behavior investigated can provide a reference for the remaining life assessment and life time extension analysis of nuclear power plant components. http://dx.doi.org/10.1016/j.msea.2015.05.093

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JF - Jaderná energetika

OECD FORD obor

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Projekt

<a href="/cs/project/TE01020118" target="_blank" >TE01020118: Elektronová mikroskopie</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering: A

ISSN

0921-5093

e-ISSN

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Svazek periodika

A 640

Číslo periodika v rámci svazku

A 640

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

566-571

Kód UT WoS článku

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EID výsledku v databázi Scopus

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