高碳硅镇静钢中失效夹杂物检测方法的探讨

摘要：采用刚塑性有限元法解析了宽厚板立轧过程中头、尾凹形和边部狗骨的形成规律。轧件长度中心区域立轧时主变形区前、后外端约束始终存在，该区金属进入主变形区前后均没有协调运动，形成的狗骨较高，长度较小。轧件头部区域立轧时主变形区后外端约束始终存在而前外端约束逐渐形成，主变形区内金属易于沿轧件宽度和长度方向流动，轧件头部区域金属离开主变形区后的协调运动导致其头部宽度不足和头部凹形增大。轧件尾部区域立轧时主变形区前外端约束始终存在而后外端约束逐渐消失，主变形区内金属易于沿轧件宽度和长度方向流动，尾部区域金属在进入主变形区之前的协调运动增大了轧件尾部凹形。研究成果可用于指导热轧宽厚板立轧头尾短行程控制轧制和开发新的宽厚板平面形状控制技术。

Inhomogenous plastic deformation mechanism of wide and heavy plate during vertical rolling

The rigid plastic finite element method was employed to clarify formation mechanism of concave shapes at wide and heavy plate ends as well as dog bone shapes at its side edge region during vertical rolling. Constraints from the rolled and to be rolled parts worked through the steady vertical rolling phase, which limited the coordinate movements of materials in the plate length center part, resulting in higher dog bone height and shorter dog bone length during the steady vertical rolling phase. Constraint from the to be rolled part worked through the plate head vertical rolling phase while constraint from the rolled part formed gradually in this phase; materials in this main plastic deformation zone flew along its width direction as well as its length direction much easier than they did during the steady vertical rolling phase. Coordinate movements of the rolled materials led to width shortage around plate head zone and increased the concave shape at plate head. Constraint from the rolled part worked through the plate tail vertical rolling phase while constraint from the to be rolled part disappeared gradually during this phase; materials in this main plastic deformation zone flew along its width direction as well as its length direction much easier than they did during the steady vertical rolling phase too. Coordinate movements of materials to be rolled increased the concave shape at plate tail during this phase. The research results can be used in short stroke control during plate vertical rolling and development of new technology for plate plane view pattern control.