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41,85 €ISBN 978-3-8191-0411-4112 pages70 figuresEnglishThesis
November 2025
New publication
eBook (PDF)
Kilian Sandner
Ultrapure, high melting Cr-Si alloys produced by various processing routes – Influence of trace elements on brittle behavior
Chromium–silicon alloys are characterized by their high liquidus temperature, good corrosion resistance, and high creep strength, making them promising candidates for high-temperature applications. However, the inherently brittle behavior of chromium-based alloys at low to intermediate temperatures has so far hindered their practical use.
This doctoral thesis demonstrates that binary Cr–Si alloys can be processed using melt metallurgy and that process optimization significantly reduce the input of the trace elements carbon, nitrogen, and oxygen. Through indentation-based fracture toughness measurements, it is shown that lowering the concentration of these trace elements reduces the brittleness of Cr–Si alloys at low temperatures. This work presents the successful production of high-purity, fracture-tough Cr–Si alloys with grain sizes of up to 4 cm.
This doctoral thesis demonstrates that binary Cr–Si alloys can be processed using melt metallurgy and that process optimization significantly reduce the input of the trace elements carbon, nitrogen, and oxygen. Through indentation-based fracture toughness measurements, it is shown that lowering the concentration of these trace elements reduces the brittleness of Cr–Si alloys at low temperatures. This work presents the successful production of high-purity, fracture-tough Cr–Si alloys with grain sizes of up to 4 cm.
Keywords: Cr-Si alloys; high temperature alloys; trace elements; ductility
Other formats
Print version: 978-3-8191-0348-3
DOI 10.2370/9783819104114
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