Secondary hardening of homogeneous T24 welds after short-term annealing at 450 and 530oC

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F20%3A10247176" target="_blank" >RIV/61989100:27360/20:10247176 - isvavai.cz</a>
Result on the web
<a href="https://www.confer.cz/metal/2020/3507-secondary-hardening-of-homogeneous-t24-welds-after-short-term-annealing-at-450-and-530-0c" target="_blank" >https://www.confer.cz/metal/2020/3507-secondary-hardening-of-homogeneous-t24-welds-after-short-term-annealing-at-450-and-530-0c</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.37904/metal.2020.3507" target="_blank" >10.37904/metal.2020.3507</a>

Result language
angličtina
Original language name
Secondary hardening of homogeneous T24 welds after short-term annealing at 450 and 530oC
Original language description
The T24 steel grade has been frequently used for the construction of membrane walls in modern power plant boilers. This steel grade has been developed with the intention of welding without post weld heat treatment. However, commissioning of new units of power plants into service revealed many defects in homogeneous T24 welds. Several remedial measures have been proposed. One of them represents annealing of boilers before putting them into service at 450 oC.This paper deals with characterization of microhardness and microstructure of homogeneous peripheral butt T24 welds after annealing at 450 oC for 48 hours and subsequent annealing at 530 oC for 10 hours. The results revealed that annealing at 450 oC led to a further increase of hardness in overheated parts of heat affected zones of homogeneous T24 welds. Subsequent short-term annealing at temperature of 530 oC, which corresponded to the typical temperature of boilers commissioning, caused a significant effect of secondary hardening in overheated parts of heat affected zones of homogeneous T24 welds. TEM investigations were carried out in order to explain this effect.
Czech name
—
Czech description
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Project
<a href="/en/project/EF17_048%2F0007373" target="_blank" >EF17_048/0007373: Damage Prediction of Structural Materials</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
METAL 2020 : 29th International Conference on Metallurgy and Materials : conference proceedings : May 20-22, 2020, Brno, Czech Republic, EU
ISBN
978-80-87294-97-0
ISSN
2694-9296
e-ISSN
—
Number of pages
6
Pages from-to
481-486
Publisher name
Tanger
Place of publication
Ostrava
Event location
Brno
Event date
May 20, 2020
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
—

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