Numerical prediction of residual stresses induced by multi-pass GTA welding of martensitic steel X10CrMoVNb9-1
Résumé
The nominal temperature in pressure vessels of future nuclear reactors -or so-called Very High Temperature Reactors using gas coolant at low ressure- should be around 450\degres C. Because of its microstructural stability at such a temperature, X10CrMoVNb9-1 martensitic steel -also known as ASTM A387 or T91 steel- is considered as a promising candidate material for these structures. Since, the Manufacturing process of such thick pressure vessels will most probably involve GTA multi-pass Welding, different studies are presently in progress in different Laboratories to develop reliable tools for the failure assessment of multi-pass weld joints in structures made of X10CrMoVNb9-1 martensitic steel. The work presented herein is part of a study the aim of which is to develop finite element simulations of TIG multi-pass welding to predict the residual stresses induced by the process in the vicinity of welded joints in thick structures made of X10CrMoVNb9-1 martensitic steel. Since the accuracy of such complex thermo-metallo-mechanical finite element analyses strongly depends on many inputs, experiments have been designed to valide the numerical tool that is currently in development.
Domaines
Matériaux
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