Abstract：The bending tests were used to simulate the peeling process of oxide scale on the surface of ultra-low carbon high strength steel sheets containing phosphorus in order to improve its descaling efficiency. The reduction on the middle of the strip was changed in the bending tests in order to study the insertion depth of the bending roll on the withdrawal and straightening leveler. The oxide scale attached to the strip substrate appears as massive exfoliation under the compressive stress,while it mainly shows as crack propagation under the tensile stress condition. An open-source image recognition software,ImageJ,was applied to evaluate the peeling rate and fracturing rate. The results show that the peeling rate of the oxide scale increases with the compressive stress,while the fracturing rate increases with the tensile stress. But both the peeling rate and fracturing rate tend to be a saturation point with the stress increase and the saturation points are quite different. The spalling form of the oxide scale between both strip sides is various due to the existence of residual stress,the different stress state between inner and outer strip surface,and the various material properties of the strip substrate and its oxide scale. The finite element software MARC was conducted to study the effect of insertion depth on the elongation of the withdrawal and straightening leveler. The results from bending tests,microscopic analysis,and simulation conclude that only the elongation cannot fully reflect the descaling effect. The stress state of the oxide scale on the strip surface is also a key factor to evaluate the descaling efficiency.
孔宁, 杨迪, 张杰, 李洪波, 王一博. 含磷高强钢板拉矫破鳞过程的氧化皮剥离机理[J]. 钢铁, 2021, 56(1): 59-68.
KONG Ning, YANG Di, ZHANG Jie, LI Hong-bo, WANG Yi-bo. Oxide scale peeling mechanism of high strength steel sheets containing phosphorus during descaling process[J]. Iron and Steel, 2021, 56(1): 59-68.
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2021, Vol. 56 
