Ultra-heavy die steels play an irreplaceable role in the manufacturing of large dies due to their excellent performance and reliable service life.However,during the continuous casting process,the defects that may form in-side the billet have a serious impact on the mechanical properties and service life of the die steel.Designing a reason-able rolling process to achieve large deformation in the core is one of the important ways to modify core defects.The finite element numerical simulation method was used to study the effects of different rolling processes on the accu-mulated deformation,single pass deformation at different positions and the yield of 42CrMo ultra-heavy steel plate,focusing on the three stages of rough rolling,flat forming,and finishing rolling of large-diameter elliptical continu-ous casting billets.The high-temperature deformation behavior and physical parameters such as thermal conductivi-ty,specific heat capacity,density,elastic modulus,and Poisson's ratio of 42CrMo steel were calculated using the material performance calculation software JMatPro.ABAQUS software was used for rolling finite element simula-tion to analyze the influence of rolling pass reduction on the internal loose compression of elliptical billets.The re-sults show that the changes in the first three passes of rough rolling have little effect on the deformation of the cen-ter,and the deformation of the center mainly depends on the single pass reduction during the finishing rolling stage.Using the first 3 passes with a smaller reduction in rough rolling and the last 5 passes with a larger reduction in fin-ishing rolling,the accumulated deformation at the center is the highest,reaching 1.5.Moreover,the strain in each of the last 5 passes is greater than 0.14,which can effectively improve the deformation permeability of the thick plate center during the rolling of large-size elliptical billets,and is conducive to the improvement of casting defects such as center cracks and looseness.
42CrMo steelelliptical billetrollingfinite element simulationultra-heavy plate
NETL
NSTL
万方数据
