Numerical Simulation of Directional Solidification of a Nickel-based Superalloy with Applied Direct Current

摘要：

　　A macroscopic thermal field calculation and a microstructure simulation are performed to investigate the directional solidification of a nickel-based superalloy with applied direct current in this study.The heat effects of electric current passing through the solidification interface as Joule heat and Peltier heat are investigated in the calculations.The calculated result shows that the Joule heat improves the temperature gradient in the solidification interface,while the effect of Peltier heat is negligible for macroscopic thermal field.The directional growth of dendrites under the influence of Joule heat is investigated with simulation.It is found that under the influence of Joule heat,the dendrites are provided with self-adjustment ability of coordinating growth to achieve flat interface in macroscale during directional solidification with the direct electric current.This interesting phenomenon is brought by the crowdedly passing through the dendrite of electric current in the solidification interface for the large difference of the electrical resistivity between solid state and melt of the superalloy.

关键词： directional solidification dendrite growth direct current Joule heat

作者: FENG Xiao-hui YANG Yuan-sheng

作者单位: Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China

会议类型: 国际会议

会议名称: The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)

会议地点: 北京

会议语种:英文

页码: 1-4

在线出版日期: 2012-10-22（万方平台首次上网日期，不代表论文的发表时间）