Influence of Long-term Annealing and Hot Bending on Creep of P92 Pipe

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F15%3A00458366" target="_blank" >RIV/68081723:_____/15:00458366 - isvavai.cz</a>

Result on the web

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

DOI - Digital Object Identifier

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

Result language

angličtina

Original language name

Influence of Long-term Annealing and Hot Bending on Creep of P92 Pipe

Original language description

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 direction. It was found that ageing at 650 °C for 10 000 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 20 000h. 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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Acta Physica Polonica. A

ISSN

0587-4246

e-ISSN

—

Volume of the periodical

128

Issue of the periodical within the volume

4

Country of publishing house

PL - POLAND

Number of pages

5

Pages from-to

543-547

UT code for WoS article

000366357300019

EID of the result in the Scopus database

2-s2.0-84950281571