Numerical simulation of deformation and microstructures evolution for hexagon hollow steels rolling

To explore the methods for improving the mechanical properties and increasing the service life, deeply analyses were carried out on the forming process of hexagon hollow steels. This paper established the three-dimensional model, calculated the strain field, stress field, temperature field by rigid-plastic FEM, built up the microstructure evolution model based on physical metallurgy theories for the rolling process of hollow steels. The variation of average grain size with rolling velocity was obtained.