Effect of Cooling Rates in Coiling Process on Microstructures and Mechanical Properties in Al-Bearing Hot-Rolled TRIP Steel |
| |
Authors: | Xiao-Hui Wang Jian Kang Yun-Jie Li Guo Yuan R D K Misra Guo-Dong Wang |
| |
Affiliation: | 1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;2. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Material and Biomedical Engineering, University of Texas at El Paso, El Paso,TX 79968, USA |
| |
Abstract: | In this study, the effect of cooling rates on microstructures and mechanical properties in a Al-bearing hot-rolled transformation-induced plasticity steel was investigated. The experiments were carried out using hot simulation machine and hot rolling mill, where the samples were cooled at different cooling rates. The results showed that with the increase in cooling rates, film-like retained austenite gradually disappeared and only blocky retained austenite was retained at higher cooling rates. The volume fraction of retained austenite was 9-11% at cooling rates of 0.05-1 °C/s and 4-6% at cooling rates of 5-10 °C/s. In addition, martensite/austenite island was observed because of the heterogeneous carbon distribution. The samples cooled at 0.05 °C/s and 0.5 °C/s exhibited excellent mechanical properties, with tensile strengths of 712 MPa and 726 MPa, total elongations of 42% and 36% and strength and ductility balances of 29.91 GPa% and 26.15 GPa%, respectively. During plastic deformation, the instantaneous work hardening exponent of the sample cooled at 0.05 °C/s increased continuously until it reached the maximum value, while the instantaneous work hardening exponent of the sample cooled at 0.5 °C/s remained stable. |
| |
Keywords: | Hot-rolled TRIP steels Cooling rate Microstructures Mechanical properties Work hardening behavior |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《金属学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《金属学报(英文版)》下载全文 |
|