Crystallography and Morphology of Niobium Carbide in As-Cast HP-Niobium Reformer Tubes
| Autor: | Milo V. Kral, Karl Buchanan |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Reflection high-energy electron diffraction
Materials science Scanning electron microscope Metals and Alloys Condensed Matter Physics Microstructure chemistry.chemical_compound Crystallography Electron diffraction chemistry Mechanics of Materials Transmission electron microscopy Niobium carbide Selected area diffraction Electron backscatter diffraction |
| Zdroj: | Metallurgical and Materials Transactions A. 43:1760-1769 |
| ISSN: | 1543-1940 1073-5623 |
| Popis: | The microstructures of two as-cast heats of niobium-modified HP stainless steels were characterized. Particular attention was paid to the interdendritic niobium-rich carbides formed during solidification of these alloys. At low magnifications, these precipitates are grouped in colonies of similar lamellae. Higher magnifications revealed that the lamellae actually obtain two distinct morphologies. The type I morphology exhibits broad planar interfaces with a smooth platelike shape. Type II lamellae have undulating interfaces and an overall reticulated shape. To provide further insight into the origin of these two different morphologies, the microstructure and crystallography of each have been studied in detail using high resolution scanning electron microscopy, transmission electron microscopy, various electron diffraction methods (electron backscatter diffraction (EBSD), selected area diffraction (SAD), and convergent beam electron diffraction (CBED)), and energy dispersive X-ray spectroscopy. |
| Databáze: | OpenAIRE |
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