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Science/Engineering Essentials of Toxic Chemical Risk: Science and Society
Science/Engineering Telefoncoaching: So machen Sie aus Ihren Mitarbeitern Telefonprofis
Science/Engineering Wireless Communications (Wiley - IEEE)
Science/Engineering Posttraumatische Belastungsstörungen (German Edition)
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Science/Engineering Testtheorie und Fragebogenkonstruktion (Springer-Lehrbuch)
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Science/Engineering Networks, Crowds, and Markets: Reasoning About a Highly Connected World {repost}
Science/Engineering Introduction to Biophotonics (repost)
Science/Engineering The Art and Science of Psychotherapy (repost)
Science/Engineering Advances in Chemical Physics - Volume 15: Stochastic Processes in Chemical Physics
Science/Engineering "Emulsion Science: Basic Principles" (repost)
Science/Engineering Elementary Principles of Chemical Processes 3rd edition
Science/Engineering Boundary Element Analysis (repost)
Science/Engineering Collection of books on physics 2
Science/Engineering A Practical Handbook of Preparative HPLC by Donald A. Wellings (Repost)
Science/Engineering Reviews of Environmental Contamination and Toxicology 184 by George W. Ware
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Science/Engineering High-purity chromium metal supply issues for gas-turbine superalloys
Posted on 2010-04-14
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More High-purity chromium metal supply issues for gas-turbine superalloys The operating parameters of an aircraft engine are extremely demanding on materials. Metal temperatures within an engine can reach as high as 1200 °C. Materials are subject to rapid oxidation and creep, high centrifugal stresses, high pressures (up to 4 megapascals), and high torque. The alloys used in engines are referred to as superalloys because of their superior combination of low- and high-temperature mechanical properties, as well as their ability to withstand harsh environments. Many of the superalloys contain high levels of chromium metal. Chromium metal limits the coarsening rate of the intermetallic (and usually coherent) precipitates; forms Cr23 C6, which strengthens grain boundaries; plays a critical role in the formation of protective scales; and improves hot-corrosion resistance. Thus a major portion of the gross engine weight consists of chromium-bearing alloys, for which there are currently no substitutes. Download links:
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