工艺参数对棒材粗轧过程晶粒尺寸影响模拟

利用商业有限元分析软件MSC．Marc，建立了轴承钢GCr15棒材六道次粗轧过程的三维有限元模型．借助MSC．Marc的二次开发功能，将轴承钢GCr15的微观组织演变模型与棒材粗轧过程的热力耦合有限元模型相结合，模拟了不同工艺参数下奥氏体晶粒尺寸的演变过程．模拟结果表明，粗轧过程中轧件中心奥氏体的晶粒尺寸随着轧制温度的升高而增大；轧制速度对晶粒尺寸的演交基本没有影响；初始晶粒尺寸和轧辊辊缝的大小对奥氏体晶粒尺寸的演变过程有一定影响，但对六道次粗轧后的晶粒尺寸影响不大．实际工艺参数下模拟得到的轧件内部晶粒尺寸与实测值吻合较好．

Simulation for influence of technological parameters on grain size during roughing rolling of rod

Based on commercial finite element analysis software MSC. Marc, a 3D finite element model for the 6-passes of roughing rolling process of GCr15 steel rod was developed. With the aid of user subroutine, the microstructure evolution model of GCr15 steel was coupled with the thermal-mechanical coupling FE model of roughing rolling process of rod to simulate the evolution of austenite grain size under different technological parameters. Simulation results show that austenite grains in the center of rolled piece become bigger with the increase of rolling temperature during the roughing rolling process. Mill speed has no influence on the evolution of grain size. Initial grain size and the adjustment of cleaning between rolls have a little effect on the evolution process of grain size, but have no effect on the grain size after the 6-passes of roughing rolling. The simulation results of the grain size in the interior of rolled piece under practical technological parameters are in good agreement with measured ones.