Oxidation Behaviour of Steel During hot Rolling by Using TiO2-Containing Water-Based Nanolubricant
- 56 Downloads
The formation and performance of oxide scale on a low-alloy steel were investigated during hot rolling at 850 and 950 °C under various lubrication conditions, including benchmarks (dry condition and water) and water-based nanolubricants containing various concentrations of nano-TiO2 from 1.0 to 8.0 wt%. The results showed that the addition of nano-TiO2 particles in the lubricant significantly reduced the thickness of oxide scale and surface oxide roughness. The reduction reached the maximum when the concentration of TiO2 was 4.0 wt%. Detailed oxide phase characterisation and oxide component fraction determination revealed that hot rolling destroyed the conventional multi-layer oxide scale and promoted magnetite and haematite formation because of easy access of oxygen from the deformed structure. The effect of TiO2 was explained by the decrease in the rolling force, which led to a higher fraction of dense retaining wustite and therefore reduced the extent of further oxidation. Increasing temperature did not change the trend of lubrication effect but raised the rate of steel oxidation in general.
KeywordsNano-TiO2 Water-based nanolubricant Steel oxidation Hot rolling
The authors acknowledge the financial supports from Baosteel-Australia Joint Research and Development Center (BAJC) under the Project of BA17004 and Australian Research Council (ARC) under Linkage Project Program (LP150100591). The authors are grateful to Mr. Suoquan Zhang at Baosteel Research Institute for the provision of steel samples. We would like to thank the technicians in the workshop of SMART Infrastructure Facility at University of Wollongong for their kind help on samples machining. We also wish to extend special thanks to A/Prof. Buyung Kosasih and Mr. Long Wang for their great supports on the ultrasonic treatment of applied lubricants. Thanks also go to Drs. Lin Wang and Chun Yu who participated in some oxide analyses when they were working at UNSW.
- 13.S. Garber and G. Sturgeon, (1959).Google Scholar
- 14.H. Wriedt, Binary Alloy Phase Diagrams, 2nd edn, ed. B. Massalski 2, (1990).Google Scholar
- 30.B. G. R. K. Singh Raman, and D. J. Young, Materials Science and Technology 14, 373 (1998).Google Scholar