Effects of grain boundaries in oxide scale on tribological properties of nanoparticles lubrication
- Publication Type:
- Journal Article
- Citation:
- Wear, 2015, 332-333 pp. 1286 - 1292
- Issue Date:
- 2015-05-01
Closed Access
Filename | Description | Size | |||
---|---|---|---|---|---|
Effects of grain boundaries in oxide scale on tribological properties of nanoparticles lubrication.pdf | Published Version | 2.67 MB |
Copyright Clearance Process
- Recently Added
- In Progress
- Closed Access
This item is closed access and not available.
© 2015 Elsevier B.V. The characters of grain boundaries in oxide layers formed on substrates influence adhesion and friction behaviour, surface fracture and wear during high temperature steel processing. In this work, an electron backscattered diffraction (EBSD) analysis was conducted to investigate the role of surface grain boundary and orientation in magnetite (Fe3 O4 )/haematite (α-Fe2 O3 ) scale during hot rolling, and further evaluate their effects on tribological properties of water-based nanoparticles lubrication. The results demonstrate that Fe3 O4 (100) plane is strongly sensitive to the surface characteristics as the minimisation of surface energy. Coincident site lattice (CSL) boundaries in microstructure is in presence of σ3 in the Fe3 O4 and σ13b in the Fe2 O3 of the substrates subjected to a thickness reduction of 28% and cooling rate of 28°C/s. This is due in great part to the changes in crystal slip systems. These low-σ CSL boundaries in oxide scale offer obstacles to the propagation of cracks, where some of nanoparticles collected would be trapped at the interface and thereby may cause high wear rates. A lubrication mechanism is proposed to explain the grain boundary effect on nanoparticles lubrication, and further to determine the dependence of frictional behaviour on surface energy, crystallographic preferred orientation (microtexture) and crystal structure. These results provide an intriguing new insight into the application of water-based lubricant with graphite nanoparticles.
Please use this identifier to cite or link to this item: