Simulation of fine grain casting process of superalloy K4202 by thermal control method

The flow field, temperature field and microstructure of complex thin-walled superalloy K4202 castings were simulated with the help of the finite element software. The results show that, with a well established filling system, the thin-walled castings can be well filled in the condition of low super-heating. According to the temperature field, the shrinkage porosity easily occurs in the thick wall location or the location with variable cross-sections. With the low super-heating pouring, the uniform structure with the grain size ASTM2-3 can be observed in the whole castings.