Creep damage of low-alloy steels after long-term exposure and its evaluation by replica method

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F18%3AN0000007" target="_blank" >RIV/25870807:_____/18:N0000007 - isvavai.cz</a>

Result on the web

<a href="https://www.metalconference.eu/cz/sbornik-metal-2018/" target="_blank" >https://www.metalconference.eu/cz/sbornik-metal-2018/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Creep damage of low-alloy steels after long-term exposure and its evaluation by replica method

Original language description

The intended operation time prolongation of the key components of fossil-fuelled power plants working in the creep conditions over 200,000 or even 250,000 hours (far beyond their original design lifetime) must be accompanied by thorough and extensive monitoring of the current material state and particularly creep damage. The extent of cavitation damage is routinely tested in-situ by using replica method and its quantification is based on a practice stated in VGB-TW 507, NORDTEST NT TR 170 or NORDTEST NT TR 302 that further develop the original Neubauer's classification. Although the evaluation of cavitation damage based on the measurement of the number of cavities and/or creep micro-cracks is a routine activity, what is still in question is the depth of the damaged area and the corresponding material properties through the wall thickness. Mutual correspondence between the creep damage evaluation performed in accordance with NORDTEST NT TR 302 and VGB TW 507 was carried out in a pipe bend made of a low-alloy 0.5Cr-0.5Mo-0.3V steel which was creep exposed at 525-540 °C for more than 225,000 hours and the relation between creep damage at the outer surface of the pipe bend (as a typical result of replica testing) and mechanical properties of the whole pipe bend are discussed in the paper with reference to the residual life assessment.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>

Continuities

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

Publication year

2018

Confidentiality

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

Article name in the collection

METAL 2018 Conference Proceedings

ISBN

978-80-87294-84-0

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

749-754

Publisher name

Tanger Ltd., Ostrava

Place of publication

Ostrava

Event location

Brno

Event date

May 23, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000461832200116