Evolution of dislocation density, size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600°C for more than 100,000 h

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Panait, Clara Gabriela^1,3  Zielinska-Lipiec, Anna²  Koziel, Tomasz²  Czyrska-Filemonowicz, Aleksandra²  Gourgues-Lorenzon, Anne-Francoise¹  Bendick, Walter⁴ 

[1] MINES ParisTech, Ctr Mat, CNRS, UMR 7633, F-91003 Evry, France

[2] AGH Univ Sci & Technol, PL-30059 Krakow, Poland

[3] Vallourec Res Aulnoye, F-59620 Aulnoye Aymeries, France

[4] Salzgitter Mannesmann Forsch GmbH, D-47259 Duisburg, Germany

关键词: Dislocation density;    MX-type precipitates;    P91 steel;    Subgrains;    Creep;   

DOI  :  10.1016/j.msea.2010.03.010

来源: Elsevier

【 摘 要 】

There are rather few quantitative data on the microstructure of the 9-12%Cr heat resistant steels after long-term creep. This paper presents results of the quantitative measurement of the size of MX precipitates, subgrain size and dislocation density in a P91 steel that had been creep tested for 113,431 h at 600 degrees C. The same measurements were conducted in the same P91 steel in the as received conditions. Transmission electron microscopy investigations were conducted using thin foils and revealed a decrease in dislocation density and an increase in subgrain size after creep exposure. MX carbonitrides are very stable during thermal and creep exposure of P91 steel at 600 degrees C up to 113,431 h. Electron backscatter diffraction (EBSD) investigations also revealed a significant change in the substructure of the steel after creep exposure. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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