Based On The Interface Of Solutes,Such As Dendritic Model And Average Volume Method Of Atomized Droplet Solidification Modeling

Numerous dendritic growth models have been developed, based on the Ivantsov result with the isothermal and isosolutal interface assumption. In reality, however,the interfacial curvature and normal velocity are variable along the interface.This would lead to the variation of curvature undercooling and solute partitioning along the interface. It means that the interface is nonisothermal and nonisosolutal.Therefore, the present work is to develop a series of models for binary alloys with nonisothermal and nonisosolutal solid-liquid interface. It includes a solute trapping model, a transport kinetics model and an extended free dendritic growth model. Based on these models a piece of software has been developed which applies to numerical simulation of the microscopoic process of the containerless solidification for micrometer-size droplets of alloys. The following conclusions have been deduced by comparing with previous models and exsting experimental data. With the existing model of comparative analysis confirmed the following conclusions. Considering the difference in non isothermal and isothermal interface interface characteristics model. The pure metal solidification model,proposes a non isothermal free tree growth model, comparative analysis of coupling better with the experimental data. After considering the characteristics of non isothermal, non solute interface will than the corresponding isothermal,solute interface with higher model prediction(along the interface, including the dendrite tip), a non isothermal solid / liquid interface binary alloy free dendrite growth model were established. To further improve the non isothermal non solute solidification model. In the non isothermal non solute interface conditions along the interface there will be additional lateral heat diffusion. This effect will lead to the previous model of tip temperature forecast is too low. The non isothermal non solute interface boundary conditions of liquid solute diffusion. Finally, considerin average conditions, considering the cooling behavior of atomized alloy droplets, and carry on the modeling with two kinds of non isothermal and non isothermal non solute model.