A combination of thermodynamic and kinetic modeling, in the framework of the CALPHAD approach, has been used to simulate the brazing process applied to the joining of a René 80 superalloy by a Df4b filler. For thermodynamic equilibrium calculations the ThermoCalc software has been used, equipped with the TCNI8 database, while diffusion simulations have been obtained using the DICTRA software. As a result, elemental as well as phase precipitation profiles in the joining area have been obtained as a function of the distance and as a function of time, during the heat treatment adopted for the brazing process. Then, calculation results have been compared to experimental observations of a real joining obtained by applying the same heat treatment of the simulation. As a conclusion the simulation procedure was validated by experiments.
Thermodynamic and Kinetic Simulation of the Brazing Process Applied to Ni-Base Superalloys
Roncallo G.;Cacciamani G.
2020-01-01
Abstract
A combination of thermodynamic and kinetic modeling, in the framework of the CALPHAD approach, has been used to simulate the brazing process applied to the joining of a René 80 superalloy by a Df4b filler. For thermodynamic equilibrium calculations the ThermoCalc software has been used, equipped with the TCNI8 database, while diffusion simulations have been obtained using the DICTRA software. As a result, elemental as well as phase precipitation profiles in the joining area have been obtained as a function of the distance and as a function of time, during the heat treatment adopted for the brazing process. Then, calculation results have been compared to experimental observations of a real joining obtained by applying the same heat treatment of the simulation. As a conclusion the simulation procedure was validated by experiments.
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