Al2O3夹杂在DC06钢中的分布及对深冲性能的影响

连退DC06钢板表面发现线链状及翘皮缺陷,初步判断是非金属夹杂物经轧制后破碎造成。通过扫描电镜(SEM)观察两种缺陷处夹杂物的微观形貌,线链状缺陷处夹杂物多为不规则的块状,翘皮处夹杂物多为颗粒状。经统计发现两种缺陷处夹杂物尺寸(d)均较小,为显微夹杂物,1.5 μm≤d≤6.2 μm。通过能谱检测分析两种缺陷处夹杂物的成分,确定夹杂物类型为非金属夹杂物Al₂O₃。通过模拟微冲压试验可知,此尺寸级别的Al₂O₃夹杂造成的线链状缺陷对连退DC06钢板的冲压性能无明显影响。翘皮缺陷已对钢板外观造成很大影响,故不再考察其对冲压性能的影响。

Distribution of Al2O3 inclusions in DC06 steel and its effect on deep drawing properties

Linear chain and warp defects were found on the surface of DC06 steel sheet with continuous annealing, which was preliminarily judged to be caused by the crushing of non-metallic inclusions. The microscopic morphology of the inclusions at the two defects was observed by scanning electron microscope (SEM). The inclusions at the linear chain defects were mostly irregular blocks, and the inclusions at the warped skin were mostly granular. According to statistics, the inclusions at the two types of defects were microscopic inclusions, the size (d) was small, 1.5 μm≤d≤6.2 μm. The composition of the inclusions at the two defects was analyzed by energy spectrum detection, and the inclusions were determined to be non-metallic inclusion Al₂O₃. Through the simulated micro-stamping test, it can be known that the linear chain defects caused by Al₂O₃ inclusions of this size level had no obvious influence on the stamping performance of the continuous drawn DC06 steel plate. The peeling defect had a great influence on the appearance of the steel plate, so its influence on the stamping performance was no longer investigated.