Microstructural stability and creep rupture strength of the martensitic steel P92 for advanced power plant

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(97)00176-6· OSTI ID:599686

Ennis, P J ^[1]; Zielinska-Lipiec, A; Czyrska-Filemonowicz, A ^[2]; Wachter, O ^[3]

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1. Research Centre Juelich (Germany). Inst. for Materials in Energy Systems
2. Univ. of Mining and Metallurgy, Krakow (Poland). Faculty of Metallurgy and Materials Science
3. Preussen Elektra AG, Hannover (Germany)

Japanese 9% Cr steel containing 0.5% Mo and 1.8% W (P92) has been investigated. Quantitative microstructural analyses using TEM of thin foils and extraction double replicas have been carried out after different austenitization and tempering treatments and after creep deformation at 600 and 650 C. Statistical quantitative analyses were undertaken to determine the dislocation density within the martensite laths, the width of the martensite laths/subgrains and the size and distribution of the carbide and carbonitride precipitates. Correlation of the results of the microstructural investigation with the creep rupture properties allowed the stability of the microstructure during the high temperature exposure to be assessed. The consequences of microstructural changes for the extrapolation of creep rupture data to design lifetimes are considered. Taking into account the strengthening mechanisms which remain effective in long term testing, the 100,000 h stress rupture strength of P92 at 600 C is estimated at 115 MPa.

• OSTI ID: 599686
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 12 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
36 MATERIALS SCIENCE
CHROMIUM STEELS
CREEP
FOSSIL-FUEL POWER PLANTS
GRAIN SIZE
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
RUPTURES
SERVICE LIFE
TUNGSTEN ALLOYS