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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 9 (1974), S. 879-886 
    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 The contribution of grain size and precipitation hardening to the yield stress and other mechanical properties was investigated. An alloy of iron with 1 % copper was prepared as supersaturated solid solution with grain sizes between 12 and 140 μm. By ageingat 500 and 600° C different precipitation hardening conditions were produced. For small particle sizes an additive behaviour of grain-boundary and precipitation hardening was found (particle radiusr 〈 50 Å). For large particle sizes the yield stress is independent of grain size (r 〉 150 Å). A transition is found for intermediate particle sizes with grain size dependence for small and independence for large grain sizes (50 Å 〈r 〈 150 Å). The effect of grain boundaries and particles on the formation and motion of dislocations is used to explain this behaviour.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 105-106 
    ISSN: 0933-5137
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 106-107 
    ISSN: 0933-5137
    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
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 49-57 
    ISSN: 0933-5137
    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: Einfluß eines Temperaturgradienten senkrecht zur Faserachse auf das Gefüge einer gerichtet erstarrten eutektischen 73C-LegierungDie thermische Stabilität einer gerichtet erstarrten eutektischen CoCrCAl-Legierung in einem Temperaturgradienten wird mit dem Verhalten unter isothermen Bedingungen verglichen.Zur Prüfung von gerichtet erstarrten Eutektika in hohem Temperaturgradienten und bei Temperaturen oberhalb 1300 K wurde eine Versuchseinrichtung entwickelt, die Experimente in unterschiedlicher Atmosphäre und im Vakuum ermöglicht. Die Versuche in diesem Gradienten-Ofen ergaben eine Vergröberung der Karbidfasern, die in dieser Legierung die Verstärkungsphase bilden. Durch die Umwandlung von Karbiden wird die Gefügestabilität beeinträchtigt.Diese Effekte werden in bezug auf isotherme Bedingungen diskutiert und ihre Auswirkungen auf die Anwendbarkeit dieser Legierung als Material für Hochtemperatur-Gas-Turbinen überprüft.
    Notes: The thermal stability of a directionally solidified (d. s.) eutectic CoCrCAl-alloy in a thermal gradient is compared to isothermal conditions.A device has been designed and constructed for examination of d. s. eutectics in high temperature gradients at temperatures above 1300 K in different atmospheres and vacuum.Experiments in this gradient furnace show coarsening of the carbide fibres forming the aligned strengthening phase. A microstructural instability resulting from the transformation of carbide fibres has been observed.These effects are discussed in relation to isothermal conditions and their implications on the applicability of the alloy as high temperature gas turbine blade material.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0933-5137
    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: Herstellung und Eigenschaften von Wärmedämmschichten für fortschrittliche GasturbinenDie Verbesserung des Wirkungsgrades stationärer wie auch fliegender Gasturbinen erfordert eine Erhöhung der Prozeßtemperaturen und damit auch der Werkstoffeinsatztemperaturen. Trotz aufwendiger Kühlung und einkristalliner Bauweise stoßen die höchstbeanspruchten rotierenden Teile in der Turbine - die Turbinenschaufeln - heute an Einsatzgrenzen, die durch den Schmelzpunkt der Ni-Superlegierungen vorgegeben sind. Hier haben Wärmedämmschichten eine zentrale Bedeutung erlangt. Aufgrund der im Vergleich zum Substrat äußerst geringen Wärmeleitfähigkeit dieser keramischen Schichten lassen sich bei innengekühlten Turbinenschaufeln Gastemperaturerhöhungen von bis zu 150°C erzielen. Wärmedämmschichten werden primär durch thermisches Spritzen (PS) oder Elektronenstrahlverdampfung (EB-PVD) hergestellt. Während PS kostengünstiger ist, weisen EB-PVD-Wärmedämmschichten ein überlegenes Schadenstoleranzverhalten auf. Zudem werden durch das Aufdampfen die Kühlluftbohrungen nicht verstopft, und aerodynamisch glatte Oberflächen bleiben erhalten. Zum Schluß wird ein Ausblick auf Forschungs- und Entwicklungstrends in der Wärmedämmschichttechnologie gegeben.
    Notes: The efficiency and performance of advanced aircraft turbines can be markedly increased if higher gas temperatures are used. Although the highly loaded blades and vanes in the high pressure turbine are heavily cooled, today's substrate materials are unable to provide sufficient strength in the temperature range up to 1500°C and above. If thermal barrier coatings (TBCs) are applied on superalloy turbine blades a substantial temperature drop of the parts can be achieved. The resulting increase in efficiency comes from reduced cooling and/or increased gas turbine inlet temperatures of up to 150°C. TBCs are either processed by plasma spraying (PS) or electron beam physical vapour deposition (EB-PVD). While PS is lower in cost EB-PVD leads to superior strain and thermoshock tolerant coatings. Furthermore, cooling hole closure of turbine blades and vanes is prevented and aerodynamic design maintained. Finally, future research and development needs in TBC technology are stressed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 609-617 
    ISSN: 0933-5137
    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: Microstructural, mechanical and corrosive properties of friction stir welded aluminium jointsFriction stir welding (FSW) is a novel solid state welding process. It allows joining of high strength aluminum alloys, generally considered as difficult-to-weld with conventional technologies, without loss in joint strength. Results of investigations on selfmade FSW butt joints of the aluminum alloys 2024-T3 and 6013-T4 are presented. First, the microstructure of the weld seam and heat affected zone is characterised metallographically and by hardness measurements. By tensile, fatigue endurance (SN) and fatigue crack propagation tests it is demonstrated, that especially the FSW-joints of 2024-T3 sustain high mechanical loadings. Investigations on the corrosion properties reveal a certain sensitivity of the 2024-T3 joints to intergranular and exfoliation corrosion.
    Notes: Das Reibrührschweißen (friction stir welding FSW) ist ein neues Fügeverfahren, mit dem auch die schwer schmelzschweißbaren, höherfesten Aluminiumlegierungen ohne große Festigkeitsverluste verschweißt werden können. Erste Ergebnisse von Untersuchungen an selbst hergestellten FSW-Stumpfnähten der Aluminiumlegierungen 2024-T3 und 6013-T4 werden vorgestellt. Zunächst wird das Gefüge der Naht und der Wärmeeinflußzone mikrostrukturell und durch Härteverläufe charakterisiert. Weiterhin wird mit Zug-, Schwingfestigkeits- und Rißfortschrittsversuchen nachgewiesen, daß insbesondere die FSW-Nähte der Legierung 2024-T3 außerordentlich hohe mechanische Belastungen ertragen. Abschließende Korrosionsuntersuchungen der FSW-Nähte zeigen eine gewisse Anfälligkeit der abschreckempfindlichen Legierung 2024-T3 für interkristalline Korrosion und Schichtkorrosion.
    Additional Material: 15 Ill.
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  • 7
    Publication Date: 1974-06-01
    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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  • 8
    Publication Date: 1993-11-01
    Print ISSN: 1155-4339
    Electronic ISSN: 1764-7177
    Topics: Physics
    Published by EDP Sciences
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  • 9
    Publication Date: 2011-08-17
    Description: Thermal gradient testing of three oxide dispersion strengthened alloys (two Ni-base alloys, MA 754 and MA 6000 E, and the Fe-base MA 956) and the directionally solidified eutectic alloy, gamma/gamma prime-alpha, have been conducted. Experiments were carried out with maximum temperatures up to 1200 C and thermal gradients on the order of 100 C/mm. The oxide dispersion strengthened alloys were difficult to test because the thermal stresses promoted crack nucleation and growth; thus the ability of these alloys to maintain a thermal gradient may be limited. The stability of individual fibers in gamma/gamma prime-alpha was excellent; however, microstructural changes were observed in the vicinity of grain boundaries. Similar structures were also observed in isothermally annealed material; therefore thermal gradients do not affect the microstructure of gamma/gamma prime-alpha in any significant manner.
    Keywords: METALLIC MATERIALS
    Type: Zeitschrift fuer Werkstofftechnik; 11; June 198
    Format: text
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