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Finite element analysis using a dislocation density based flow stress model coupled with model for precipitate evolution

M. Fisk ; A. Lundbäck ; Joel Andersson (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; L.-E. Lindgren
8th International Symposium on Superalloy 718 and Derivatives 2014; Pittsburgh; United States; 28 September 2014 through 1 October 2014 p. 155-168. (2014)
[Konferensbidrag, refereegranskat]

Gas Tungsten Arc Welding is simulated using the finite element method. The material model that has been used is a physically based plasticity model, coupled with a model for nucleation, growth, and coarsening of second phase particles. The material model is well suited for thermo-mechanical simulations and is used to predict microstructural changes, residual stresses and stress relaxation after post weld heat treatment. The residual stress state after welding is compared, using two different material models. One were the evolution of the precipitates is included and one where it is not. It is shown that the welding direction has an impact on the precipitate size and its distribution and thereby the residual stress state.

Nyckelord: Finite element method; Nucleation growth and coarsening; Physically based material model



Denna post skapades 2015-03-11.
CPL Pubid: 213628

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Ämnesområden

Materialteknik

Chalmers infrastruktur