A micro-macro approach for the thermal, metallurgical and mechanical modeling of the welding of duplex stainless steel structures
M'Hamdi, M.
,
Fjær, H.G.
Modeling of Casting, Welding and Advanced Solidification Processes - XI , Opio (France), 2006-05-28--06-02. Vol 2, 847-854
- Publ. year
- 2006
- Publ. type
- paper
- Abstract
- Welding conditions have a strong impact on the mechanical characteristics of welded structures. Numerical simulation is therefore a key tool for the design of the welding conditions and providing data for weld integrity assessment methodologies. The purpose of the present contribution is to present a 3D model for the welding of steel components with emphasis on duplex steels. The model describes the coupled thermal, metallurgical and mechanical phenomena occurring in the heat affected zone (HAZ) during a welding operation. Phase transformations in duplex steels are modeled adopting a micro-macro approach. At the microscopic scale, an isokinetic model for phase transformations, presented elsewhere, is incorporated in the welding simulation tool enabling the prediction of e.g. the ferrite/austenite fractions and the grain size. Moreover, phase dependent thermo-physical and mechanical properties are taken into account using mixture formulations. Local grid refinement/coarsening techniques are employed for an efficient solution of the problem. To illustrate the capabilities of the model, the simulation tool is applied to the multi-pass welding of two duplex steel plates, and the resulting residual stresses are presented.
- Availabilty
- bibl@ife.no
