碳钢/不锈钢同速异径蛇形轧制复合变形规律

Deformation laws of carbon steel/stainless steel in snake roll-bonding with same speed and different diameters

为提高碳钢/不锈钢板材轧制复合界面结合强度并降低轧后弯曲,采用ANSYS LS-DYNA有限元软件模拟了碳钢/不锈钢在1200℃开轧温度下的同速异径蛇形轧制复合过程,分析了不同压下率、辊径比、错位量与初始板厚等对轧后板材变形行为的影响规律,并进行了轧制复合实验,验证了有限元模拟的准确性。结果表明,与同步轧制和异步轧制相比,同速异径蛇形复合轧制能提高轧后板材界面结合强度并降低轧后弯曲。增大压下率可提高轧后板材界面的结合强度和轧后层厚比,且随压下率和辊径比的增大,轧后板材均出现反向弯曲,表明存在合适工况使轧后板材平直,如当初始板厚为20 mm,压下率为40%,错位量为5 mm,辊径比为1.15~1.20,初始层厚比为0.25~0.33时,轧后板材接近平直。

To improve the bonding strength of roll-bonding interface of carbon steel/stainless steel plate and reduce the bending after roll-ing,the finite element software ANSYS LS-DYNA was used to simulate the snake roll-bonding process with same speed and different di-ameters for carbon steel/stainless steel at the rolling temperature of 1200℃.The effect laws of different reduction rates,roll radius ratios,offsets and initial plate thicknesses on the deformation behaviors of rolled plates were analyzed.The roll-bonding experiments were carried out to verify the accuracy of finite element simulation.The results show that compared with synchronous rolling and asynchronous rolling,the snake roll-bonding with same speed and different diameters can improve the interface bonding strength and reduce the bending after rolling.Increasing the reduction rates can improve the interface bonding strength and thickness ratio after rolling.And with the increase of reduction rate and roll radius ratio,the rolled plates are bent reversely,which indicates there are suitable conditions to make the rolled plates flat.For example,the rolled plate is nearly flat when the initial plate thickness is 20 mm,the reduction rate is 40%,the offset is 5 mm,the roll radius ratio is 1.15-1.20 and the initial layer thickness ratio is 0.25-0.33.