Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel |
| |
Authors: | Xiao-pei Wang Ai-min Zhao Zheng-zhi Zhao Yao Huang Liang Li Qing He |
| |
Institution: | 1. Engineering Research Institute, University of Science and Technology Beijing, Beijing, 100083, China
|
| |
Abstract: | The microstructures and properties of hot-rolled low-carbon ferritic steel have been investigated by optical microscopy, field-emission scanning electron microscopy, transmission electron microscopy, and tensile tests after isothermal transformation from 600°C to 700°C for 60 min. It is found that the strength of the steel decreases with the increment of isothermal temperature, whereas the hole expansion ratio and the fraction of high-angle grain boundaries increase. A large amount of nanometer-sized carbides were homogeneously distributed throughout the material, and fine (Ti, Mo)C precipitates have a significant precipitation strengthening effect on the ferrite phase because of their high density. The nanometer-sized carbides have a lattice parameter of 0.411–0.431 nm. After isothermal transformation at 650°C for 60 min, the ferrite phase can be strengthened above 300 MPa by precipitation strengthening according to the Ashby-Orowan mechanism. |
| |
Keywords: | ferritic steel nanoparticles mechanical properties carbides precipitation strengthening |
本文献已被 维普 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
| 点击此处可从《矿物冶金与材料学报》下载免费的PDF全文 |