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通过SEM和热轧实验研究了高强船板花斑缺陷的形成机理及影响因素。结果表明:花斑由抛丸后残留的氧化铁皮构成。氧化铁皮与基体接触的界面凸凹不平、氧化铁皮厚度不均匀是形成花斑的主要原因。降低钢中Si和Mn的含量可减少加热过程中硅橄榄石和锰橄榄石的形成,增加钢板的可除鳞性,减少钢板表面氧化铁皮残留。提高轧制温度和终冷温度可有效减小氧化铁皮与基体界面接触长度。采用ACC(层流冷却)冷却方式,抛丸效果较好。
The formation mechanism and influential factors of high-intensity ship plaque defects were studied by SEM and hot rolling experiments. The results show that the spot is composed of the oxide scale left after shot blasting. The interface between the scale and the substrate is uneven, and the uneven thickness of the scale is the main reason for the formation of the speckle. Reducing Si and Mn in the steel reduces the formation of forsterite and peridotite during heating, increases the descaling property of the steel sheet, and reduces the scale residue on the steel sheet surface. Increasing the rolling temperature and the final cooling temperature can effectively reduce the contact length between the scale and the substrate. ACC (laminar cooling) cooling, shot blasting better.