Thermomechanical model for solidification and cooling simulation of Ni-based superalloy components

One of the challenges encountered in industrialization new single-crystal superalloys parts (like high-pressure turbine blades and vanes for aircraft engines) is to limit mechanical stresses during solidification cooling metal. In order accurately predict viscoplastic flow as well thermo-mechanical behaviour Ni-based superalloy its cooling, this study a thermodynamically-consistent thermo-elasto-viscoplastic model was developed. This takes into account solid-liquid transition occurring material phase. done by introducing compressible-type yield function based on appropriate equivalent stress depending volume fraction solid phase formed propagation dendrites inside liquid material. implemented Abaqus/Standard© F.E. code applied identification parameters using isothermal tensile-relaxation tests driven different strain rates temperatures. First, anisothermal tensile-compression test simulated single integration point. A comparison experimental numerical stress-strain response partially validate model. Second, benchmark involving casting rectangular bar sand mold analyzed.