| Hydrogenation creator is a core equipment of oil refining in petroleumindustry.2.25Cr-1Mo-0.25V steel which has a high strength, hydrogencorrosion resistance and high temperature creep resistance is the prior materialfor hydrogenation creator. The crystal plastic finite element simulation canindicate the plastic transformation of metals in mesoscale. It can combine thetraditional crystal plastic theory and finite element method and thetransformation is based on the dislocation motion. This paper establishes2.25Cr-1Mo-0.25V steel crystal plastic finite element model and analyzessimulation result. It makes contribution to the control of2.25Cr-1Mo-0.25Vsteel plastic working process.First of all, use Fortran language to write material constitutive relation.And it is implanted into large finite element software ABAQUS by material usersubprogram UMAT. By establishing single crystal single direction stretchingcrystal plastic finite element model, it is indicated that the crystal rotating anglewill increase with strain and the primary direction will affect the macromechanical property.Secondly, for2.25Cr-1Mo-0.25V steel compressing test, the ABAQUS cansimulate the typical parameter in hot compression process. The translocationdifference-time curve of representative element in macro simulation is regard asboundary condition. The test curve is matched with multicrystal simulationcurve to confirm the crystal plastic finite element param of2.25Cr-1Mo-0.25Vsteel.At last, the2.25Cr-1Mo-0.25V steel crystal plastic finite elementsimulation result is analyzed. The distribution of mechanical responds isnonuniformed after transformation. The large deformation zone is distributed atboundaries, but also in the inside of crystal. In the meantime, the different sizesand strain rate will affect the simulation result. With the grain size and strainrate decreasing, the hardening effect is remarkable in the plastic deformationprocess. And the grid density is related to the calculating accuracy. |
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