Effect of bainite microstructure during two-step quenching and partitioning process on strength and toughness properties of a 0.3%C bainitic steel
| Autor: | Xuefei Huang, Qiang-Guo Li, Weigang Huang, Cheng-Hui Su |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Quenching Austenite Toughness Materials science Bainite Metals and Alloys 02 engineering and technology Lath engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Mechanics of Materials Martensite 0103 physical sciences Materials Chemistry engineering Composite material 0210 nano-technology Ductility |
| Zdroj: | Journal of Iron and Steel Research International. 25:235-242 |
| ISSN: | 2210-3988 1006-706X |
| DOI: | 10.1007/s42243-018-0032-4 |
| Popis: | The effect of bainite transformation and microstructure on the mechanical properties in 0.3%C bainitic steel was investigated via the heat treatment process of quenching at higher initial temperature and partitioning below martensite-start temperature. The results show that bainite transformation takes place with the partitioning time increasing during partitioning below martensite-start temperature. The microstructure of samples treated by this two-step quenching and partitioning process consists of lath bainite, lath martensite and retained austenite. This kind of multiphase microstructure exhibits better strength of 1420 MPa, ductility of 21.8% and the product of strength and elongation of 30.8 GPa%. Furthermore, the excellent impact toughness of 103 J is exhibited by partitioning at 280 °C for 3 h. In addition, the coalescence of bainite platelets was found in the sample treated by partitioning for 8 h, leading to the deterioration of toughness. |
| Databáze: | OpenAIRE |
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