ENHANCING THE CRYOGENIC IMPACT TOUGHNESS OF FERRITIC STEEL BY MULTI-TYPE AND FINE-MICROSTRUCTURE DESIGN
| Autor: | Zi-cheng Liu, Peng Gao, Jia-kuan Ren, Cheng-gang Li, Wu-bo Zhong, Zhan Hu, Zhen-yu Liu |
|---|---|
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Materiali in tehnologije. 57 |
| ISSN: | 1580-3414 1580-2949 |
| DOI: | 10.17222/mit.2020.234 |
| Popis: | Based on pure melting, multi-type and fine-microstructure design, a ferritic steel with an outstanding combination of cryogenic impact toughness and strength was fabricated. The microstructure was characterized by means of optical microscopy, electron back-scattered diffraction and transmission electron microscopy. The steels with different final cooling temperatures of 663 °C and 560 °C show ferrite and perlite microstructure, and ferrite grain size can be refined from 3.15 µm to 2.67 µm by lowering the final cooling temperature from 663 °C to 560 °C. Moreover, a higher volume fraction of acicular ferrite and polygonal ferrite can be obtained for a lower final cooling temperature of 560 °C. Hence, the cryogenic impact toughness can be enhanced, and the brittle failure can be suppressed, even at –110 °C, showing a higher impact toughness compared with other ferritic steels. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|