|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Shape Casting: 6th International Symposium
||Real-time Radiography and Modeling of Porosity Formation in an A356 Aluminum Alloy Wedge Casting
||Vahid Khalajzadeh, Christoph Beckermann, David D. Goettsch
|On-Site Speaker (Planned)
The formation of shrinkage porosity in a wedge shaped A356 aluminum casting is observed in real time using video radiography. An image processing technique is developed to quantify the through-thickness average porosity distribution in the casting as a function of time. The solidification and cooling of the casting is simulated in order to obtain the temperature and solid fraction fields. It is found that once the wedge becomes isolated from the in-gate, surface sinks develop until the solid fraction reaches approximately 50%. Subsequently, internal porosity starts forming in the upper part of the wedge. This interdendritic porosity spreads over the region with the lowest solid fraction and continually increases until the casting is fully solidified. The maximum porosity percentage is measured in the thermal center of the wedge. A computational model is proposed to predict the evolution of the porosity in the aluminum casting.
||Planned: A print-only volume