MICROSTRUCTURE OF 08CH18N10T AUSTENITIC STEEL AFTER THERMO-MECHANICAL FATIGUE TESTS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F16%3A%230000613" target="_blank" >RIV/47718684:_____/16:#0000613 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

MICROSTRUCTURE OF 08CH18N10T AUSTENITIC STEEL AFTER THERMO-MECHANICAL FATIGUE TESTS

Original language description

The fatigue properties and microstructure of 08Ch18N10T steel used for production of the interior of a pressure water reactor VVER 440 were investigated. The influence of the service conditions was simulated using thermo mechanical strain controlled low cycle fatigue tests in the range from 150°C to 270°C. The cyclic stress behaviour was investigated at different total strain amplitudes. The cyclic test to rupture and fractographic analysis were carried out. Selected tests were interrupted at different stages of fatigue life and changes in microstructure were evaluated. Dislocation density was determined using transmission electron microscopy and X-ray diffraction. Dislocation rich and dislocation poor regions appeared as a result of cyclic loading. Vein structure and successive formation of persistent slip bands and dislocation cells were observed similar to those in FCC metal monocrystals fatigued at room temperature. Dislocation density increased considerably at the beginning of cyclic loading; maximum was reached at 0.05 of life time. The following gradual decrease was related to rearrangement of dislocations into the walls. Simultaneously the nature of the dislocations changed. A majority of the screw dislocations occurred in as received conditions and at the beginning of cyclic loading. The fraction of edge dislocations increased with the increasing number of cycles. Distance between persistent slip bands and size of dislocation cells were related to the distance between striations on the fracture surface.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

JF - Nuclear energy

OECD FORD branch

—

Project

<a href="/en/project/TE01020118" target="_blank" >TE01020118: Electron microscopy</a><br>

Continuities

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

Publication year

2016

Confidentiality

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

Article name in the collection

METAL 2015

ISBN

978-80-87294-62-8

ISSN

—

e-ISSN

—

Number of pages

6

Pages from-to

566-571

Publisher name

TANGER Ltd

Place of publication

Ostrava

Event location

Brno

Event date

—

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—