Hydrogen Reduction Kinetics of Oxide Scale of Hot Rolled Steel During Cold Rolling at Low Pressure
SUN Bin1,*, GAO Shenglun1, HAO Mingxin1, CAO Guangming2, LI Zhifeng3
1 Mechanical Engineering Institute, Shenyang University, Shenyang 110044, China 2 State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, China 3 School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010,Inner Mongolia,China
Abstract: To understand hydrogen reduction kinetics of oxide scale of hot rolled steel during cold rolling at low pressure,the single pass cold rolling test of oxide scale was carried out using 5% and 10% deformation. The reduction kinetics tests with 5% deformation and without cold rolling spe-cimens, which reacted with 30vol% H2-N2at the temperature range of 500—800 ℃, were investigated by thermogravimetric analysis(TGA).The results show that a considerable amount of cracks appeared in oxide scale after 5% and 10% deformation of cold rolling. After 5% deformation, oxide scale became only cracking without spalling, while powered scale spalled from substrate during 10% deformation.The induction period of oxide scale could be shorten after 5% deformation at 500—600 ℃, while it was almost not changed at 700—800 ℃.The control steps of oxide scale reduction by hydrogen includes diffusion of hydrogen and oxygen atoms in oxide scale, gas-solid interface reaction, and nucleation and growth of new phases.The reduction reaction control step of oxide scale was nucleation and growth of new phases at 500 ℃, while it became gas-solid interface reaction at 800 ℃.
孙彬, 高圣伦, 郝明欣, 曹光明, 李志峰. 小压下冷轧对热轧带钢氧化铁皮氢气还原动力学的影响[J]. 材料导报, 2023, 37(4): 21090067-6.
SUN Bin, GAO Shenglun, HAO Mingxin, CAO Guangming, LI Zhifeng. Hydrogen Reduction Kinetics of Oxide Scale of Hot Rolled Steel During Cold Rolling at Low Pressure. Materials Reports, 2023, 37(4): 21090067-6.
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2023, Vol. 37 
