为了优选锻造工艺参数,从物理模拟和数值模拟两个方面对45钢轴类零件在径向锻造中的锻透性进行了研究。在物理模拟方面,在Gleeble-1500D热模拟试验机上对铸态45钢试样在应变速率为1s-1,变形温度为1100℃条件下进行了等温恒应变速率压缩试验,观察了不同压缩量下铸态45钢的金相组织。结果表明,铸态45钢样的晶粒度随着压下量的增加而细化,压缩到一定程度后晶粒度趋于稳定。在数值模拟方面,运用DEFORM 3D软件对45钢轴类零件的径向锻造过程进行了模拟,研究了不同压下量和不同锻打速度对锻透性的影响。结果表明,锻透性随压下量的增加而增大。 In order to optimize forging process parameters, the forging perfor mance of 45 steel shaft parts in radial forging was studied from two aspects of physical simulation and numerical simulation. In the aspect of physical simulation, the isothermal constant strain rate compression test was carried out on a Gleeble-1500D thermal simulation test machine at a strain rate of 1 s-1 and a deformation temperature of 1100 ° C. The compression rate of the as- As-cast 45 steel microstructure. The results show that the grain size of as-cast 45 steel sample is refined with the increase of the reduction, and the grain size tends to be stable after being compressed to a certain extent. In the aspect of numerical simulation, the radial forging process of 45 steel shaft parts was simulated by DEFORM 3D software, and the effect of different reduction rates and different forging speeds on the forging permeability was studied. The results show that the forging permeability increases with the reduction of pressure.