连铸辊硬面层工作状态有限元分析

Finite Element Analysis of Working State of Hard Surface Layer of Continuous Casting Roller

根据连铸辊尺寸建立有限元模型,测定其工作周期及表面温度,确定20 s为1个工作循环周期。采用ANSYS软件计算连铸辊硬面层工作状态下的温度场、应力及应变场,分析多次循环周期中硬面层温度、应力和应变变化规律及失效风险,提出延长连铸辊硬面层使用寿命的措施。结果显示:连铸辊1个工作周期内,硬面层最高和最低温度分别为742,132℃,最大温差为610℃;硬面层的表面层最大应力可达1 030 MPa,表面层先后产生弹性变形和塑性变形,应变随循环次数的增加而增大,50次循环形变量可达0.007 mm;近表面层产生弹性变形和塑性变形晚于表面层,50次循环最大形变量可达0.004 7 mm;硬面层的表面层与近表面层在50次循环中均受到较大应力,产生较大应变,但表面层受到的应力和产生的应变程度更大,失效风险较大。建议从材料本身入手如通过添加Nb,Ti,V等元素改善硬面层的综合性能,延长硬面层使用寿命。

The finite element model was established according to a continuous casting roller size,and the work cycle and surface temperature of continuous casting roller were measured,and 20 s was determined as a work cycle.ANSYS software was used to calculate the temperature,stress and strain fields of the hard surface layer under the working condition.The changes in temperature,stress,and strain of the hard surface layer during multiple cycles and their failure risks were analyzed,and the measures to extend the service life of the hard surface layer of the continuous casting roller were proposed.The results show that within a working cycle of continuous casting roller,the highest and lowest temperature of the hard surface layer are 742,132℃,and the maximum temperature difference is 610℃.The maximum stress of the surface layer of hard surface layer of is up to 1030 MPa.The surface layer undergoes elastic deformation and plastic deformation successively,and the strain increases with the number of cycles,and the deformation variable of surface layer can reach 0.007 mm after 50 cycles.The elastic and plastic deformation of near-surface layer occurs later than that of the surface layer,and the maximum deformation can reach 0.0047 mm after 50 cycles.The surface layer and the near-surface layer of the hard surface layer are subjected to significant stresses and larger strains during 50 cycles,but the surface layer is subjected to larger stress and strain,resulting in a higher risk of failure.It is recommended to start from the material itself,such as by adding elements such as Nb,Ti,V,etc,to improve the comprehensive performance of the hard surface layer and extend the service its life.