Properties and microstructure of weldments made of new austenitic steels after creep exposure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F17%3AN0000026" target="_blank" >RIV/25870807:_____/17:N0000026 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.metal2018.com/files/uploads/02/METAL2017_conference_proceedings_content.pdf" target="_blank" >https://www.metal2018.com/files/uploads/02/METAL2017_conference_proceedings_content.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Properties and microstructure of weldments made of new austenitic steels after creep exposure

Popis výsledku v původním jazyce

The newly developed grades of austenitic heat resistant steels (Super 304H, HR3C, TP 347 HFG) exhibit superior corrosion resistance in steam as well as creep strength thanks to their fine-grained microstructure, especially in case of Super 304H and TP 347 HFG. They are worldwide used in USC power plant boilers and substitute steels AISI 316, AISI 321 and/or AISI 347 formerly used in superheater and reheater tubes. On the other hand, the structural stability of these new steels is under examination, especially form the viewpoint of -phase precipitation, which is known for its embrittlement effect. The precipitation of -phase was already found in the mentioned steels after long-term annealing at working temperature in the base material of tubes as well as in the tube bends. However, it seems that the presence of applied stress (and/or deformation) significantly promotes the precipitation of this phase. Therefore, much more and coarser particles of -phase were detected in the weldments after creep exposure. The paper presents the results of stress rupture tests of welded tubes made of steels Super 304H and HR3C, the assessment and prediction of long-term creep life and describes also the structural changes that appeared in these steels, especially precipitation of -phase, when significant difference in the amount of -phase between the both steels was revealed.

Název v anglickém jazyce

Properties and microstructure of weldments made of new austenitic steels after creep exposure

Popis výsledku anglicky

The newly developed grades of austenitic heat resistant steels (Super 304H, HR3C, TP 347 HFG) exhibit superior corrosion resistance in steam as well as creep strength thanks to their fine-grained microstructure, especially in case of Super 304H and TP 347 HFG. They are worldwide used in USC power plant boilers and substitute steels AISI 316, AISI 321 and/or AISI 347 formerly used in superheater and reheater tubes. On the other hand, the structural stability of these new steels is under examination, especially form the viewpoint of -phase precipitation, which is known for its embrittlement effect. The precipitation of -phase was already found in the mentioned steels after long-term annealing at working temperature in the base material of tubes as well as in the tube bends. However, it seems that the presence of applied stress (and/or deformation) significantly promotes the precipitation of this phase. Therefore, much more and coarser particles of -phase were detected in the weldments after creep exposure. The paper presents the results of stress rupture tests of welded tubes made of steels Super 304H and HR3C, the assessment and prediction of long-term creep life and describes also the structural changes that appeared in these steels, especially precipitation of -phase, when significant difference in the amount of -phase between the both steels was revealed.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2017 - 26th International Conference on Metalurgy and Materials

ISBN

978-80-87294-79-6

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

882-887

Název nakladatele

Tanger, Ltd., Keltičkova 62, 710 00 Ostrava. Czech Republic

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

24. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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