Influence of long-term annealing and hot bending on creep of P92 pipe

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60193247%3A_____%2F14%3AUJP1686E" target="_blank" >RIV/60193247:_____/14:UJP1686E - isvavai.cz</a>

Výsledek na webu

<a href="http://przyrbwn.icm.edu.pl/APP/PDF/128/a128z4p18.pdf" target="_blank" >http://przyrbwn.icm.edu.pl/APP/PDF/128/a128z4p18.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.128.543" target="_blank" >10.12693/APhysPolA.128.543</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of long-term annealing and hot bending on creep of P92 pipe

Popis výsledku v původním jazyce

This work is focused on the creep behaviour of the thick-walled hot bended P92 pipe, with an outer diameter of 350 mm and wall thickness of 39 mm, in its different parts, namely in straight parts and bends. Selected creep specimens machined from axial section of pipe were thermally aged at 650°C to simulate microstructure degradation typical for long-term service conditions. Subsequent tensile creep tests at constant load were performed at 600 °C under 140 MPa and creep behaviour of various structure states was compared. Microstructure was investigated by scanning electron microscopy equipped with electron backscatter diffraction. It was found that ageing at 650 °C for 104 h caused the significant reduction of creep resistance down to about 10% of initial state and an additional slight reduction of creep resistance after longer ageing for 2 x 104 h. Further, creep behaviour was significantly influenced by specimen position in the extrados and intrados parts of bends. Microstructure investigation revealed that long-term annealing has negligible effect on high-angle grain boundary spacing and misorientation. By contrast, creep deformation of long-term annealed specimens led to significant decreasing in high-angle grain boundary spacing and caused a change in the misorientation distribution of boundaries.

Název v anglickém jazyce

Influence of long-term annealing and hot bending on creep of P92 pipe

Popis výsledku anglicky

This work is focused on the creep behaviour of the thick-walled hot bended P92 pipe, with an outer diameter of 350 mm and wall thickness of 39 mm, in its different parts, namely in straight parts and bends. Selected creep specimens machined from axial section of pipe were thermally aged at 650°C to simulate microstructure degradation typical for long-term service conditions. Subsequent tensile creep tests at constant load were performed at 600 °C under 140 MPa and creep behaviour of various structure states was compared. Microstructure was investigated by scanning electron microscopy equipped with electron backscatter diffraction. It was found that ageing at 650 °C for 104 h caused the significant reduction of creep resistance down to about 10% of initial state and an additional slight reduction of creep resistance after longer ageing for 2 x 104 h. Further, creep behaviour was significantly influenced by specimen position in the extrados and intrados parts of bends. Microstructure investigation revealed that long-term annealing has negligible effect on high-angle grain boundary spacing and misorientation. By contrast, creep deformation of long-term annealed specimens led to significant decreasing in high-angle grain boundary spacing and caused a change in the misorientation distribution of boundaries.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/TA02010260" target="_blank" >TA02010260: Výzkum materiálových změn nových, progresivních ocelí, používaných na výstavbu a rekonstrukce parovodů energetických a chemických zařízení</a><br>

Návaznosti

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

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the International Symposium on Physics of Materials (ISPMA13)

ISBN

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ISSN

1898-794X

e-ISSN

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Počet stran výsledku

5

Strana od-do

-1

Název nakladatele

Polish Academy of Sciences

Místo vydání

Warsaw, Poland

Místo konání akce

Prague, Czech Republic

Datum konání akce

31. 8. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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