Wyniki wyszukiwania - BazTech

1

Modeling of two-stage solidification: Part II computational verification of the model

Wodo O., Gawrońska E.

Archives of Foundry Engineering

|

2013

|

Vol. 13, iss. 1

125--130

EN

In Part I of this article, two-stage solidification model was presented. In this part we use our model to simulate solidification of the Al 7% Si alloy for two cooling rates - 2 deg/s and - 20 deg/s. Simulations have been performed for two eutectic transformation modes, typical for modified and unmodified alloys. Obtained cooling curves are qualitatively consistent with the typical cooling curves for modified and unmodified alloys. Moreover, evolution of cooling-curve characteristics is compared with the analytical model and found to be in close agreement.

2

Modeling of two-stage solidification: Part I model development

Wodo O., Gawrońska E.

Archives of Foundry Engineering

|

2012

|

Vol. 12, iss. 4

151-156

EN

The paper presents a new numerical model of solidification processes in hypoeutectic alloys. The model combines stochastic elements, such as e.g. random nucleation sites and orientation of dendritic grains, as well as deterministic methods e.g. to compute velocity of dendritic tips and eutectic grains. The model can be used to determine the temperature and the size of structure constituents (of both, the primary solid phase and eutectics) and the arrangement of individual dendritic and eutectic grains in the consecutive stages of solidification. Two eutectic transformation modes, typical to modified and unmodified hypoeutectic alloys, have been included in the model. To achieve this, cellular automata and Voronoi diagrams have been utilized.

3

A model for grain growth based on the novel description of dendrite shape

Wodo O., Sczygiol N.

Archives of Foundry Engineering

|

2007

|

Vol. 7, iss. 4

183-188

EN

We use novel description of dendritic shape in the micro solid phase growth model. The model describes evolution of both primary solid solution dendrite and eutectic that forms between arms and grains in the last stage of solidification. Obtained results show that our approach can be used in grain growth model to determine more reliable eutectic distribution. In the paper no kinetics connected with the eutectic transformation is taken into account. However, this does not affect the eutectic distribution because at the beginning of eutectic reaction all liquid phase was assumed to fully transform into eutectic. Results for solid phase growth model based on this description are presented. The obtained results of eutectic distribution are especially important in the hypoeutectic alloy solidification case, where the eutectic grains grow between formed solid solution grains. Thus, the distribution of solid solution grain becomes crucial due to its influence on the delay in solid fraction increase of eutectic grains.

4

Modelling of equiaxed grain growth in solidification process

Wodo O., Sczygiol N.

Archiwum Odlewnictwa

|

2004

|

R. 4, nr 14

558-563

EN

In this paper we discuss the object-oriented software designed to implement simulation of the equiaxed grain growth in solidifying casting using cellular automata (CA). We present example of the numerical simulation for aluminium-7% silicon alloy. Finally, we point out possible extensions of the system.

PL

W pracy przedstawiono autorską obiektową realizację systemu do symulacji wzrostu struktury równoosiowej w krzepnącym odlewie z wykorzystaniem automatu komórkowego. Pokazano wyniki przykładowej symulacji dla stopu dwuskładnikowego (AI-7% Si). Omówiono również możliwe sposoby rozbudowy systemu.