|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals IV
||Numerical Modelling of porosity with combined gas and shrinkage effects in HPDC
||Utkarsh Godwal, Shishira Bhagavath, Bita Ghaffari, Mei Li, Peter D Lee, Shyamprasad Karagadde
|On-Site Speaker (Planned)
High Pressure Die casting is a manufacturing process in which near-net shape components are produced at very fast rates under pressurized environment. However, due to the relatively higher cooling rates prevailing during the process, isolated liquid pockets might form in some regions of the casting leading to the formation and growth of porosity due to lack of intensification. To capture this phenomenon, a 1-D deformable grid numerical model has been developed which combines diffusion model with the shrinkage effected growth. For both pure gas and shrinkage effected growth, the pore radius was found to decrease with increase in ambient pressure. Furthering the solidification, the pore interacts with the solid and grows between the dendrites, with extra pore growth also captured at high pressures. The correlations obtained from the model were used to predict porosity in the large castings by integrating the model with the numerical simulations of HPDC.