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  • 1
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Observations concerning the influence of small additions of cerium mixed metal on the scaling of steelsThe addition of appr. 0.1 % cerium mixed metal to steel X 10 CrNi 18 10 has practically no influence on the isothermal oxidation of the steel in air at 800 and 900°C, but improves the adhesion of the scale under temperature cycling conditions. The positive effect of cerium becomes apparent only after extended annealing or after several temperature cycles respectively. In the case of steel 10CrMo9 10 the addition of cerium mixed metal in quantities up to 0.3% has practically no effect. With cerium contents of 0.75%, however, annealing in air at temperatures around 600 °C results in a scale showing excellent adhesion and resisting even quenching in water without spalling. Cerium contents of this level, however, give rise to changes of the mechanical and technological properties of the steel so that their practical use should be out of the question.
    Notes: Ein Zusatz von rd. 0,1% Cermischmetall zum Stahl X 10 CrNi 18 10 beeinflußt die isotherme Oxydation des Stahls in Luft bei 800 und 900°C kaum, verbessert jedoch die Haftung des Zunders bei Temperaturwechselbeanspruchung. Die verbessernde Wirkung des Cers tritt erst nach einer längeren Glühzeit bzw. nach mehreren Temperaturwechseln in Erscheinung.Beim Stahl 10CrMo910 sind Zugaben von Cermischmetall bis zu Gehalten von etwa 0,3% praktisch ohne Wirkung. Ein Gehalt von 0,75% Ce führt jedoch beim Glühen an Luft bei Temperaturen um 600 °C zu einem ungewöhnlich fest haftenden Zunder, der auch ein Abschrecken in Wasser ohne Abplatzen übersteht. Derartig hohe Cergehalte verändern jedoch die mechanisch-technologischen Eigenschaften des Stahls, so daß eine praktische Anwendung kaum in Betracht kommt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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