Long-term creep rupture strength prediction and failure mechanisms of welded joints of boiler tubes and pipes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F16%3AN0000014" target="_blank" >RIV/25870807:_____/16:N0000014 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Long-term creep rupture strength prediction and failure mechanisms of welded joints of boiler tubes and pipes

Original language description

Operating life and reliability of steam boiler and piping systems are considerably determined by long-term creep rupture strength (CRS) of welded joints of boiler tubes and pipes. Consequently, the appreciable research effort has been focused to reveal the most important factors affecting the creep properties of weldments. The presented work deals with the evaluation of creep rupture strength of welded joints in steam boiler piping system made from low-alloy and chromium modified steels. Cross-weld creep rupture tests and, at the same time, comparative creep tests of parent material are considered as the optimum approach how to evaluate the decreasing of creep resistance of weldment towards the base metal and how to quantify this effect e.g. by using strength reduction factor (SRF) and lifetime reduction factor (LRF) of welded joints. The necessary condition for such an approach is that the mechanism of creep damage (type IV cracking) in laboratory tests must be the same that acts in in-plant welded joints of the mentioned steels. The obtained results confirmed that the precipitation strengthened steels (mainly Cr-Mo-V type) show more pronounced decreasing of creep rupture strength of the critical locality of welded joint – intercritical part of heat affected zone when compared to Cr-Mo steels and that they are, therefore, much more prone to the premature failure.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

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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)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Article name in the collection

25. ročník mezinárodní konference metalurgie a materiálů METAL 2016

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

753-758

Publisher name

Tanger s.r.o.

Place of publication

Brno

Event location

Brno

Event date

Jan 1, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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