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基于金相分析和气泡试验,分析了高强度船板表面花斑缺陷的形貌特征和微观组织,研究了化学成分、轧制工艺对花斑缺陷的影响。结果表明:花斑缺陷的形成原因主要是二次氧化铁皮在轧制过程中被压入钢板基体,导致钢板表面形成厚度差异较大的氧化铁皮,钢板抛丸后形成凹凸不平的斑状缺陷。通过降低钢中硅含量、优化高压水除鳞方式、低成本改进高压水除鳞系统,有效控制了高强度船板表面花斑缺陷。
Based on metallographic analysis and bubble test, the morphological characteristics and microstructure of the fretting defects on the surface of high strength ship deck were analyzed. The effects of chemical composition and rolling process on the fretting defects were studied. The results showed that the main cause of the flaky defects was that the secondary scale was pressed into the steel substrate during the rolling process, resulting in the formation of scale with large difference in thickness on the steel surface. By reducing the silicon content in steel and optimizing the descaling method of high pressure water, the high pressure water descaling system can be improved at low cost, which effectively controls the flaky defects on the surface of high strength shipboard.