Effect of PWHT on microstructure and creep properties of homogeneous welds made of HR3C steel
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F19%3AN0000058" target="_blank" >RIV/25870807:_____/19:N0000058 - isvavai.cz</a>
Alternative codes found
RIV/26722445:_____/19:N0000086
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Effect of PWHT on microstructure and creep properties of homogeneous welds made of HR3C steel
Original language description
There are high demands placed on ensuring the integrity when building blocks of fossil power plants with USC steam parameters. Weld joints are critical parts of fossil power units. At present, the behaviour of the new austenitic steels such as HR3C (X6CrNiNbN 25-20) is not sufficiently described. The paper deals with the effect of Post-Weld Heat Treatment (PWHT) at 1230 °C on both creep behaviour and microstructure evolution in homogeneous weld joints made of modern austenitic steel HR3C. Stress rupture tests were performed on the cross-weld joints of tubes ø 38 x 6.3 mm at 700 °C with times to rupture up to nearly 22,000 hours. The structural changes after long-term creep exposure were studied on longitudinal sections by various microscopic techniques. The stress rupture test results of welds after PWHT revealed their higher creep resistance when compared to the As-Welded state (AW). The calculated creep rupture strength at 700 °C/100,000 hours of BM and weld joint after PWHT are almost the same, while. The AW samples as opposed to PWHT samples did not show a noticeable growth of the austenitic grain size in Heat-Affected Zone (HAZ). In specimens after PWHT the average grain size in HAZ was more than twice that of BM. The aim of this paper is to study the microstructure and creep behaviour of the homogeneous HR3C weld joints in two states, both after welding and after post-weld heat treatment.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
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)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Metal 2019 Conference Proceedings
ISBN
978-80-87294-92-5
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
810 - 815
Publisher name
Tanger Ltd., Ostrava
Place of publication
Ostrava
Event location
Brno
Event date
May 19, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
999