Meng Yanan, Sun Jianlin, Wu Ping, Dong Chang, Yan Xudong
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Departments of Foundational Science, Beijing Union University, Beijing 100101, China.
Nanomaterials (Basel). 2018 Feb 16;8(2):111. doi: 10.3390/nano8020111.
In this paper, nano-TiO2lubricating fluid was chosen as an advanced rolling lubricant to investigate its effect on the hot rolled surface and metallographic structure of SS41 steel strips. The tribological performances of nano-TiO2 lubricating fluid were measured by a four-ball tribotester. The hot rolling experiments under different lubrication conditions were carried out by a four-high rolling mill. The surface morphology, oxide scales and metallographic structure after hot rolling were observed using a confocal laser scanning microscope and scanning electron microscope (SEM), respectively. The composition of surface attachments was analyzed with X-ray photoelectron spectroscopy (XPS). The results indicate that the nano-TiO2 lubricating fluid has a better tribological performance. The surface defects on the hot rolled surface could be decreased. The phase composition of the surface still appears as a mixture of ferrite and pearlite. The surface of steel strips is not micro-alloyed with titanium as predicted. Additionally, the grain size of rolled steel strips which were lubricated with the nano-TiO2lubricating fluid decreased by nearly 50%, compared with traditional lubricating fluid. Furthermore, it was found that the thickness of the oxide layers on the surface reduced, whilst the Rockwell hardness of the oxide layers was enhanced as nano-TiO2 lubricating fluid was applied.
本文选用纳米TiO₂润滑液作为一种先进的轧制润滑剂，研究其对SS41钢带热轧表面和金相组织的影响。采用四球摩擦磨损试验机测定纳米TiO₂润滑液的摩擦学性能。利用四辊轧机进行不同润滑条件下的热轧实验。分别使用共聚焦激光扫描显微镜和扫描电子显微镜（SEM）观察热轧后的表面形貌、氧化皮和金相组织。用X射线光电子能谱（XPS）分析表面附着物的成分。结果表明，纳米TiO₂润滑液具有较好的摩擦学性能。热轧表面的缺陷可以减少。表面的相组成仍然表现为铁素体和珠光体的混合物。钢带表面并没有如预期那样与钛进行微合金化。此外，与传统润滑液相比，用纳米TiO₂润滑液润滑的轧制钢带的晶粒尺寸减小了近50%。此外，还发现随着纳米TiO₂润滑液的应用，表面氧化层的厚度减小，而氧化层的洛氏硬度提高。
