Abstract
In this study, FEM analyses were made on long-term creep of over 60 years in double U groove welded modified 9Cr-Mo steel plates with typical microstructures in the welded region of the steel plates taken into consideration. The typical welded region of the plates consists of solidified weld, coarse grain HAZ, fine grain HAZ, interfacial HAZ and base metal. These microstructures were modeled as polycrystal structures having slip systems approximated by orthotropic deformation properties. Orthotropic visco-elastic and visco-elastic-plastic finite element analyses were made on the polycrystalline model. The results obtained were compared with existing experimental results and those obtained by the authors and found to agree with these experimental results. The results revealed that the visco-elastic-plastic finite element analyses with a yield stress of 245 MPa gives the creep rupture curve which most closely fitted the existing experimental creep rupture data.
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