WE Seminar: Martin Fisk, Simulation of Microstructural Evolution during Repair Welding of an IN718 Plate

Assoc. Prof. In Materials Science and Applied Mathematics, Malmö University, Malmö, Sweden

Abstract

A precipitate evolution model based on classical nucleation, growth and coarsening theory is adapted and solved using the multi-class approach for the superalloy IN718. The model accounts for dissolution of precipitates and is implemented in a finite element program. The model is used to simulate precipitate evolution in the fused zone and the adjacent heat affected zone for a welding simulation. The calculated size distribution of precipitates is used to predict Vickers hardness. The simulation model is compared with nanoindentation experiments. The agreement between simulated and measured hardness is good.

Bio

Martin Fisk is associated professor in Material mechanics at the Department of Materials science and Applied Mathematics at Malmö University, Sweden. His research interests are material modeling and simulation of thermo-mechanical manufacturing simulations. Superalloys exposed for non-isothermal heat treatments coupled to its mechanical properties is of special interest. Typical thermo-mechanical manufacturing simulations are welding and induction heating. Small/Wide Angle X-ray Scattering (SAXS/WAXS) have been used to study the microstructural evolution in these alloys. Martin Fisk took his PhD at Luleå University of Technology at the division of Material mechanics 2011 before he became an assistant Professor at Malmö University.