200mm×200mm连铸坯连轧Φ100mm 42CrMo钢三维有限元模拟

3-Demensional Finite Element Simulation on Continuous Rolling Φ100mm Steel 42CrMo by 200mm×200mm Cast Bloom

采用MSC.Marc有限元模拟软件,针对200 mm×200 mm连铸方坯连轧Φ100 mm 42CrMo圆钢工艺过程进行三维热力耦合模拟仿真。因圆角在孔型中塑性应变较大且变形由表及里逐渐深入,因此对断面采用网格偏差划分方法以细分表层及圆角区域单元。根据连轧过程应力场、应变场和温度分布及轧制力和轧制力矩变化特点,得出合金钢轧制时圆角易出现裂纹的重要原因是该区域总等效塑性应变、等效应力和温降较大。机架间及轧后断面尺寸实测值与模拟值相符合。

3-demensional thermodynamic coupling simulation for continuous rolling process of Φ100 mm round steel 42CrMo by 200 mm× 200 mm cast bloom has been carried out by using MSC. Marc finite element simulation software. As the plastic stain at round corner of stock in pass is larger and the deformation is gradually from surface to inner, the method of grid deviation division for cross section is adopted to fine the element of surface and round corner area. Based on the characteristics of stress field, strain field and temperature distribution as well as change of rolling force and torque during continuous rolling process, it is obtained that during alloy steel roiling; the larger total equivalent strain, equivalent stress and temperature drop are key reason of occurred crack at round corner of stock. The simulated values of cross section size of stock between stands and after roiling correspond to the measured values.