| METALS AND METAL MATRIX COMPOSITES |
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| 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
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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 |
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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 ℃.
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Published: 25 February 2023
Online: 2023-03-02
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| Fund:Natural Science Foundation of China (51301111), Natural Science Foundation of Liaoning Province of China (2019-KF-05-04), and Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Programme(RC200387). |
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2023, Vol. 37 
