Projektinitiativ #22: Dendrite network formation and apparent viscosity (DENVIS) ( 2 kommentarer)

It is known that there are several characteristic temperatures during the solidification which are related to the feeding mechanisms. During the solidification, the dendritic crystals will form a network and the flow of melts will be suppressed due to the network formation. The temperature at which the dendrite crystals network formed is referred to as dendrite coherency temperature.

Taishi Matsushita presents the initiative during the 2017 conference

Another important temperature during the solidification is called the rigidity temperature. Below this temperature, the stress act on the dendritic network will exceed the strength of the network and the network will be collapsed. After this, the dominant feeding mechanism becomes so-called “burst feeding”.

These characteristic temperatures might be determined from the apparent viscosity or rheological properties using a rotational viscometer/rheometer. The viscosity of suspension was discussed almost hundred years after Einstein’s model for the viscosity of the suspension. However, in most models, it is assumed that the solid phase is the spherical shape and the viscosity is described as a function of solid fraction. In this project, a measurement technique and model to determine the above-mentioned characteristic temperatures will be developed.

Namn Taishi Matsushita
Organisation Jönköping University

Kommentar #1

This is interesting for Scania CV AB if cast iron melts are investigated.

Namn Jessica Elfsberg
Organisation Scania CV AB

Kommentar #2

This appears to be a highly interesting technique, at least in laboratory scale. Even more so if there is a possible further development to a robust and reliable method to be used also in a production environment for high TRL levels.

Namn Åsa Lauenstein
Organisation Swerea SWECAST AB