CALPHAD法(計算状態図）援用による積層造形用材料の開発

抄録

CALPHAD is the method to calculate phase diagrams, and it has become an essential tool for material development. The Gibbs energy of the metal phase is modeled as a function of temperature and composition, and an equilibrium state is determined by minimization of the Gibbs energy in system. A popular application of the CALPHAD method is solidification simulation, whereby performing equilibrium calculations while lowering the temperature, it is possible to calculate the solidified structure and changes in components. Thermo-Calc, a popular software for the CALPHAD method, have functions of phase diagram calculations, solidification simulations, and models for predicting various material properties. Recently, it had a module to calculate material changes during additive manufacturing. The function of additive manufacturing simulation uses the finite difference method to search for the optimal powder components and molding conditions while considering various parameters such as laser power, scan speed, powder melting point, and boiling point. In this report, we show a calculated result of the printable map of SUS316 stainless steel in an additively manufacturing.