Internal stresses after welding for age hardening materials: advanced modelisations vs neutrons characterizations
Welding process induced in the heat affected zone (HAZ) and in the molten zone various complex phenomena: cyclic loading, miscrostructural evolutions, fluid flow within the weld pool, etc... In many key industries such as transportation (aerospace, automotive…) and energy (nuclear) the prediction of residual stresses after welding is a challenge to know the service life of key components. To achieve this goal, the finite element (FE) method [1] is often used. Many commercial packages such as Abaqus, Code_Aster or Sysweld may be used to simulate the welding process. However when coupling between thermomechanical and microstructural effects is required as for age hardening materials, but the current FE models are not satisfactory. In fact, several phenomena that can occur in the HAZ are not classically considered: precipitates can nucleated, growth, coarse and dissolve [2][3][4][5]. These evolutions induce important differences on the mechanical behavior: during welding hardening or softening may occur, depending on the precipitation kinetics which is linked to the temperature history [3][4][5][6]. So a coupled approach (microstructural/mechanical) must be used to model the HAZ.
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BARDEL Didier; NELIAS Daniel; PANCHENG Shao and PIRLING Thilo. (2013). Internal stresses after welding for age hardening materials: advanced modelisations vs neutrons characterizations. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-135
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