Field of Expertise: Advanced Material Science

Prediction of hot tearing on industrial steel casting using a viscoplastic model coupled with damage
Semin Hadzic
Institute for Material Science and Welding
11:00 - 11:20 Thursday 24 October 2013 HS II, Alte Technik

Hot tears are one of the most unacceptable defects in steel casting that can be found in final a product. A hot tear is a fracture formed in the mushy zone with a high fraction of solid due to applied tensile strain. The solidification grade, the deformation and the porosity are calculated using commercial software with a user-defined constitutive model. This shrinkage porosity information is coupled to the solid deformation constitutive model to calculate damage. To achieve this, a viscoplastic model including damage is developed to predict the potential hot tear locations in steel alloy casting. Furthermore, an industrial steel casting experiment has been designed and performed in four geometry variations to proof the effectiveness of hot tear model. A good correlation is observed between damage predictions and hot tear in the test castings inspected with ultra-sonic.

Keywords: Hot tear, Casting, Steel alloy, Viscoplastic, Damage