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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oxidation of metals 18 (1982), S. 115-126 
    ISSN: 1573-4889
    Keywords: Iron-silicon ; oxidation ; creep ; scale morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Studies of the simultaneous creep and oxidation of Fe-1Si and Fe-4Si alloys at a constant tensile stress of 16 N· mm−2 at 973–1073 K have shown that scales formed at oxygen partial pressures of 20–1013 mbar were thicker by a factor of 2 than those formed on uncrept specimens. Scales on uncrept alloys comprised alternate layers of wustite and fayalite, whereas scales on crept alloys exhibited an additional external layer of magnetite. Only intergranular oxidation (fayalite) was observed in uncrept alloys, but crept alloys showed both intra- and intergranular oxidation (silica). Uniquely nodular scales were formed only on the Fe-4Si alloy on crept and uncrept specimens. Oxidized, uncrept Fe-1Si showed a fine-grained ferrite substrate which was absent in the crept alloy. It is believed that oxide growth stresses stimulated a recrystallization process.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Oxidation of metals 20 (1983), S. 19-35 
    ISSN: 1573-4889
    Keywords: Low-carbon steel ; cyclic oxidation ; oxide spallation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation and oxide spallation of 1%Cr–0.5%Mo low carbon steel disks in dry oxygen was studied isothermally at 800°C (1073 K) and in thermal cycling between 800 and 600°C (1073 and 873K) followed by cooling at rates from 3 to 100°C/min. Mostly parabolic oxidation kinetics were observed. Thin scales (10 μ) were more prone to spalling than thicker scales (20 μ). The thickness and growth imperfections of an inner scale layer enriched in chromium, molybdenum, and silicon strongly influenced the probability of cohesive failure exceeding that of adhesive failure of the scale. Cohesive failures in the bulk scale during thermal cycling were probably nucleated at voids and microcracks produced in the initial isothermal period of scale growth. The number of segmented scale layers that became detached during cycling was governed by the number of parallel rows of voids in the scale and not necessarily by the number of cycles.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 192-192 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the course of studying the oxidation process for a simplified system (ortho-boric acid coatings on high purity iron) at temperatures between 700 and 1,100 C in pure oxygen, a complex reaction product in the oxide scale was identified as oiron boro-ferrite (4 FeO.Fe2O3.B2O3), which we believe to ...
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 1 (1980), S. 225-231 
    ISSN: 1572-9567
    Keywords: thermal diffusivity ; iron oxide ; isothermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the flash technique, the thermal diffusivity of iron oxide has been measured as a function of time at temperatures ranging from 623 to 753 K to study the isothermal decomposition of wustite to magnetite and iron. The results are briefly discussed in terms of transformation kinetics and it is shown that the data are consistent with the growth of a fixed number of nuclei, all of which are present at the start of transformation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 12 (1977), S. 2303-2309 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxide scales of different thickness and structure were grown on iron. Fracture of scales was studied when the underlying iron substrate was torsionally deformed at room temperature. For thin scales (5μm) with a porous interface structure, the nucleation and growth of cracks occurred by the successive joining of interface pores. Slowly cooled scales of intermediate thickness (20μm) failed by crack growth along oxide grain boundaries and from sharp corners of magnetite cuboids within wustite zones. For thick scales (35μm), cracks nucleated from the base of the outermost magnetite crystallites. Rapidly cooled, thick scales exhibited crack nucleation from the sharp edges of voids at the scale/metal interface. Crack spacing in the oxide scale decreased with increasing substrate strain in a parabolic form.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 886-893 
    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: Gefüge und Haftung von Oxidzunder auf FeNiMo- und FeCrMo-LegierungenVoruntersuchung über das Gefüge und die Hafteigenschaften von Oxidzunder auf Fe mit (%) 1,8 Ni, 0,3 Mo bzw. 1 Cr und 0,5 Mo in Sauerstoff bei 930 und 1250°C.Zwischen 930 und 1130°C verläuft die Oxidation der FeNiMo-Legierung Langsamer als die der FeCrMo-Legierung, doch lag die Oxidationsgeschwindigkeit beider Legierungen unter der von hochreinem Eisen.Heißbiegeversuche und Heißbiegeversuche mit einer aus Zunder und Metall bestehenden Probe zeigten, daß der Zunder aus einer festhaftenden inneren Schicht (angereichert mit CrMo oder Ni) und einer Masse mit geringer Kohäsion bestand.In der FeNiMo-Legierung kam es zum Bruch der letztgenannten Zone, und zwar entlang einer glatten Fläche, an der Kante der mit Ni angereicherten Zone, wáhrend im Falle der FeCrMo-Legierung der Bruch in der mit Cr und Mo angereicherten Zone an der Zunder/Metall-Grenzfläche auftrat.
    Notes: The Structure and Adhesion of Oxide Scales on Fe—Ni—Mo and Fe—Cr—Mo Alloys A preliminary study has been made of the structure and adhesion of oxide scales formed on Fe-1.8 wt.% Ni-0.3wt.% Mo and Fe-1wt.% Cr-0.5wt.% Mo in oxygen at 930°-1250°C.From 930°-1250°C, the Fe—Ni—Mo alloy oxidised at a slower rate that the Fe—Cr—Mo alloy, and both alloys oxidised at a slower rate than high-purity iron.Hot bend tests and hot tensile tests of a scale-metal joint revealed that the scales comprised a strongly adherent inner layer (enriched in Cr—Mo or Ni) and a weakly coherent bulk structure.In the Fe—Ni—Mo alloy, failure in the bulk scale occured along a smooth plane at the edge of the Ni-enrichment zone whereas in contras, for the Fe—Cr—Mo alloy, failure occured withing the Cr—Mo enriched zone adjacent to the scale-metal interface.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1971), S. 1493-1498 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tensile creep studies of the embrittlement of notched iron by liquid copper in the range 1100 to 1130° C have shown the embrittlement to be of the delayed failure type, from diffusion-controlled, grain boundary penetration by copper with accompanying extended surface notching. Linking of surface cracks and internal cavities along copper-penetrated grain boundaries was the final failure mode. Crack growth was determined by the rate and amount of copper diffusion ahead of a crack and not by the feed of liquid to the crack tip.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1971), S. 1493-1498 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tensile creep studies of the embrittlement of notched iron by liquid copper in the range 1100 to 1130° C have shown the embrittlement to be of the delayed failure type, from diffusion-controlled, grain boundary penetration by copper with accompanying extended surface notching. Linking of surface cracks and internal cavities along copper-penetrated grain boundaries was the final failure mode. Crack growth was determined by the rate and amount of copper diffusion ahead of a crack and not by the feed of liquid to the crack tip.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 1971-12-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
    Publication Date: 1977-11-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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