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Article Dans Une Revue Journal of Materials Engineering and Performance Année : 2016

Numerical Modeling of Tube Forming by HPTR Cold Pilgering Process


For new fast-neutron sodium-cooled Generation IV nuclear reactors, the candidate cladding materials for the very strong burn-up are ferritic and martensitic oxide dispersion strengthened grades. Classically, the cladding tube is cold formed by a sequence of cold pilger milling passes with intermediate heat treatments. This process acts upon the geometry and the microstructure of the tubes. Consequently, crystallographic texture, grain sizes and morphologies, and tube integrity are highly dependent on the pilgering parameters. In order to optimize the resulting mechanical properties of cold-rolled cladding tubes, it is essential to have a thorough understanding of the pilgering process. Finite Element Method (FEM) models are used for the numerical predictions of this task; however, the accuracy of the numerical predictions depends not only on the type of constitutive laws but also on the quality of the material parameters identification. Therefore, a Chaboche-type law which parameters have been identified on experimental observation of the mechanical behavior of the material is used here. As a complete three-dimensional FEM mechanical analysis of the high-precision tube rolling (HPTR) cold pilgering of tubes could be very expensive, only the evolution of geometry and deformation is addressed in this work. The computed geometry is compared to the experimental one. It is shown that the evolution of the geometry and deformation is not homogeneous over the circumference. Moreover, it is exposed that the strain is nonhomogeneous in the radial, tangential, and axial directions. Finally, it is seen that the dominant deformation mode of a material point evolves during HPTR cold pilgering forming.


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Dates et versions

hal-01354089 , version 1 (17-08-2016)



Denis Sornin, Edgar-Alejandro Pachon-Rodriguez, Esteban Vanegas Márqueza, Katia Mocellin, Roland E. Logé. Numerical Modeling of Tube Forming by HPTR Cold Pilgering Process. Journal of Materials Engineering and Performance, 2016, 25 (9), pp.4059-4069. ⟨10.1007/s11665-016-2203-4⟩. ⟨hal-01354089⟩
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