Microstructural evidence of nano-carbides in medium carbon high silicon multiphase steels
| Autor: | K. Mondal, Sandeep Sangal, A. Varshney, Ashit Kumar Pramanick, Gouthama |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Austenite Materials science Silicon Bainite Mechanical Engineering Metallurgy Alloy chemistry.chemical_element 02 engineering and technology Lath engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Carbide chemistry Mechanics of Materials Ferrite (iron) 0103 physical sciences engineering General Materials Science 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 708:237-247 |
| ISSN: | 0921-5093 |
| Popis: | High silicon steels containing 1.5–2 wt% silicon are considered to form carbide free bainite. However, the present work shows experimental evidence for the formation of nano-carbides in a series of medium carbon (0.61 wt%) high silicon (1.71 wt%) low alloy mixed phase steels with the help of transmission electron microscopy. The nano-carbide formation in bainite is attributed to the formation of inter-critical ferrite during continuous cooling, resulting in partitioning of carbon and silicon at the austenite-ferrite interface, leading to an increase in carbon and decrease in silicon at the austenite side of the interface. Due to diffusionless growth of supersaturated bainitic ferrite lath under para-equilibrium conditions, formation of bainite proceeds with higher carbon and lower silicon, allowing carbide formation in the bainite during subsequent holding at bainitic transformation temperature. Nano-carbides along with mixed phase microstructures are attributed to the excellent combination of high strength and high ductility in the present steels. |
| Databáze: | OpenAIRE |
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