Simulation and Test Validation on Die forging Process of 1Cr16Co5Ni2MoWVNbN Heat-resistant Steel Ball seat

Abstract

The dynamic recrystallization behavior of 1Cr16Co5Ni2MoWVNbN heat-resistant steel during thermal deformation was studied by thermal compression simulation experiments. The effects of strain rate and blank size on the die forging process of 1Cr16Co5Ni2MoWVNbN heat-resistant steel ball seat were studied by Deform 3D finite element numerical simulation. The results of thermal compression test showed that the critical deformation of 1Cr16Co5Ni2MoWVNbN heat-resistant steel was about 20% when full dynamic recrystallization happened and the phenomenon of mixed crystalline was not obvious. And increasing the strain rate was conducive to obtaining a more uniform structure under small deformation. The numerical simulation results showed that with the increase of the strain rate， the equivalent strain and equivalent stress in the minimum deformation area of the die forging increased. And With the increase of the diameter of the blank， the equivalent strain in the minimum deformation zone of the die forging decreased， and the equivalent stress decreased first and then increased. When the strain rate is 0.1 s-1， and the diameter of the blank is 60 mm - 65 mm， the engineering strain in the minimum deformation area can reach more than 20%， and it had good forging formability. According to the numerical simulation results， a blank size with diameter of 60 mm and height of 74 mm was designed to verifying the forming of the die forging with strain rate of 0.1 s-1. The forgings were well formed， uniform in structure and hardness， which verified the rationality and feasibility of the numerical simulation results.

Keywords

• 1cr16co5ni2mowvnbn heat-resistant steel； numerical simulation； die forging forming； deform 3d software； dynamic recrystallisation