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

• Authors: P. Kral , J. Dvorak , M. Kvapilova , K. Kucharova , V. Sklenicka , M. Svobodova , J. Cmakal
• Languages of publication: EN

Abstracts

EN

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 2×10⁴ 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.

Keywords

EN

81.05.-t; 81.40.-z; 62.20.Hg; 68.37.Hk

Discipline

• 62.20.Hg: Creep
• 81.05.-t: Specific materials: fabrication, treatment, testing, and analysis(for superconducting materials, see 74.70.-b, and 74.72.-h; for magnetic materials, see 75.50.-y; for optical materials, see 42.70.-a; for dielectric materials, see 77.84.-s; for disperse systems and complex fluids, see 82.70.-y; see also 82.75.-z Molecular sieves, zeolites, clathrates, and other complex solids; for materials properties, see sections 60 and 70)
• 68.37.Hk: Scanning electron microscopy (SEM) (including EBIC)
• 81.40.-z: Treatment of materials and its effects on microstructure, nanostructure, and properties

• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 4
• Pages: 543-547

Dates

published

2015-10

Contributors

author

P. Kral

• Institute of Physics of Materials, ASCR, Zizkova 22, 616 62 Brno, Czech Republic

author

J. Dvorak

• Institute of Physics of Materials, ASCR, Zizkova 22, 616 62 Brno, Czech Republic
• CEITEC-IPM, Institute of Physics of Materials, ASCR, 616 62 Brno, CR

author

M. Kvapilova

• Institute of Physics of Materials, ASCR, Zizkova 22, 616 62 Brno, Czech Republic
• CEITEC-IPM, Institute of Physics of Materials, ASCR, 616 62 Brno, CR

author

K. Kucharova

• Institute of Physics of Materials, ASCR, Zizkova 22, 616 62 Brno, Czech Republic

author

V. Sklenicka

• Institute of Physics of Materials, ASCR, Zizkova 22, 616 62 Brno, Czech Republic
• CEITEC-IPM, Institute of Physics of Materials, ASCR, 616 62 Brno, CR

author

M. Svobodova

• UJP PRAHA, a.s., 156 10 Prague-Zbraslav, Czech Republic

author

J. Cmakal

• UJP PRAHA, a.s., 156 10 Prague-Zbraslav, Czech Republic

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Identifiers

DOI

10.12693/APhysPolA.128.543