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VIRCAST hot tearing interface

An interface dedicated to hot tearing prediction is available in the VIRCAST software tool. Two models developed at EPFL are considered: a thermal and a mechanical criterion:
- In the thermal criterion, the maximum strain rate sustainable by the mush at the root of the dendrites is computed for a given cavitation depression. The inverse of this quantity yields the hot tearing sensitivity. This criterion can be implemented in pure thermal models.

- In the mechanical criterion, the pressure drop due to the solidification shrinkage and to the deformation undergone by the mush (given by the strain rate perpendicular to the thermal gradient) is computed. The larger the pressure drop, the more prone the alloy to develop cracks. This criterion can be implemented in thermo-mechanical models.

The interface allows to read the required model inputs and to visualize the typical results.

The results to be displayed are:
- Thermal criterion:
-- Maximum strain rate sustainable by the mushy zone, epsmax [1/s];
-- Hot cracking sensitivity, 1/epsmax [s].

- Mechanical criterion:
-- Pressure drop in the mushy zone [Pa];
-- Hot cracking index: 1 or 0 [-].

Reported by

Calcom SA
Parc Scientifique EPFL/PSE-A