Influence of high magnetic field on carbides and the dislocation density during tempering of high Chromium-containing steel
| Autor: | K. M. Wu, Guanghui Wu, L. Chen, T.P. Hou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Number density Materials science Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field Carbide Solid solution strengthening Precipitation hardening 0103 physical sciences Tempering Dislocation 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 479:43-49 |
| ISSN: | 0304-8853 |
| Popis: | The influence of a 12 Tesla magnetic field on the microstructure of high Chromium-containing steel during tempering was investigated. The experimental results revealed that an external magnetic field significantly increases the number density of carbide (Fe, Cr)3C and the dislocation density. The external magnetic field decreases the Gibbs free energy of (Fe, Cr)3C and then decreases the nucleation barrier; hence, the number density of (Fe, Cr)3C increases by approximately 2.42 times. The higher number density of carbides doubles the dislocation density, corresponding to the larger critical unpinning stress τ c , which results in a dislocation pile-up in front of the carbides. The hardness change is negligible with an external 12 T magnetic field because the increment of hardness due to the denser carbides (Fe, Cr)3C and dislocations that originate from the 12 T magnetic field offsets the decrement of hardness that results from the decrease in the solid solution strengthening from the carbon atoms. The investigation of the impact of an external high magnetic field on the behavior of carbides and dislocations can provide a better understanding for the precipitation strengthening mechanism of nuclear fusion steels. |
| Databáze: | OpenAIRE |
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