The Bonding Characteristics and Local Structure of Carbon in Solution and Iron Carbides in Iron Using C K-Edge X-Ray Absorption Spectroscopy Measurement and First-Principle Calculation
| Autor: | Masashi Nakatake, Sho-Ichi Takakura, Mitsuharu Yonemura, Yuki Yoshimoto |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
X-ray absorption spectroscopy Materials science Absorption spectroscopy Precipitation (chemistry) Metallurgy 0211 other engineering and technologies Metals and Alloys Analytical chemistry chemistry.chemical_element 02 engineering and technology Condensed Matter Physics Microstructure 01 natural sciences Carbide chemistry K-edge Mechanics of Materials Martensite 0103 physical sciences Carbon 021102 mining & metallurgy |
| Zdroj: | Metallurgical and Materials Transactions A. 50:4435-4444 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-019-05328-4 |
| Popis: | The bonding characteristics and local structure of carbon in Fe-0.79 mass pct C martensitic and pearlitic steels are investigated using C K-edge X-ray absorption spectroscopy (XAS) and full-potential real-space multiple-scattering calculations. We find that the subpeak at 288 to 290 eV is related to the precipitation of carbides such as θ-Fe3C, η-Fe2C, e-Fe3C, and χ-Fe5C2. Consequently, martensitic and pearlitic steels are characterized by peaks at 283 and 288 eV, respectively. The decay in the intensity of the peak at 288 eV follows carbon dilution in the θ-carbide, which is crucial for carbon aggregation. Since no high-precision C K-edge XAS spectral data are currently available for θ-Fe3C and carbon in solution, we believe that the proposed method is a suitable one for elucidating the mechanism of formation of the microstructure of steel from the viewpoint of carbon precipitation. |
| Databáze: | OpenAIRE |
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