Hardenability of Nanocrystalline Bulk Steel
| Autor: | Sasan Yazdani, Behzad Avishan, Mitra Abdolalipour Asl Jani |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Bainite Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process Nanocrystalline material Nanomaterials Cross section (physics) 0103 physical sciences Thin film 0210 nano-technology Chemical composition Hardenability |
| Zdroj: | Transactions of the Indian Institute of Metals. 71:493-503 |
| ISSN: | 0975-1645 0972-2815 |
| Popis: | It is critical to obtain nanocrystalline materials in large chunks rather than only in thin film or rod shapes and nanostructured bainitic steels are good examples of bulk nano materials. This article aims to investigate the hardenability of nanobain steel to estimate the biggest cross section that can be successfully austempered to form nanocrystalline bainite. Isothermal heat treatments were conducted at different temperatures using salt bath furnaces, the quench severity factors of which were determined at bainitic transformation temperature ranges. It was found that, the proper chemical composition selection increased the hardenability and shifted the upper C-curve of the Time–Transformation–Temperature diagram to longer heat treatment times. Accordingly, large chunks of nanostructured bainite with almost 330, 340 and 390 mm diameters could be austempered to obtain nanobain successfully in salt bath furnaces of 300, 250 and 210 °C, respectively. The nanocrystalline bainite was composed of nanoscale bainitic subunits of 30–70 nm thicknesses depending on transformation temperature. |
| Databáze: | OpenAIRE |
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