Numerical study of heat transfer of gas-atomized Fe-6.5 %Si （mass and solidification behavior fraction） droplets

作     者：Ke-Feng Li Yun-Hu Zhang Chang-Jiang Song Qi-Jie Zhai 

作者机构：State Key Laboratory of Advanced Special Steel School ofMaterials Science and Engineering Shanghai UniversityShanghai 200072 People's Republic of China 

出 版 物：《Advances in Manufacturing》 (先进制造进展（英文版）)

年 卷 期：2016年第4卷第2期

页      面：150-156页

核心收录：

学科分类：08[工学] 

基　　金：国家自然科学基金 

主　　题：Fe-6.5%Si (mass fraction) alloy Gasatomization Solidification - Heat transfer Numericalsimulation 

摘      要：During spray atomization process, the heat transfer and solidification of droplets play very important roles for the deposition quality. Due to the difficulties of experimental approach, a numerical model is developed, which integrates liquid undercooling, nucleation recalescence and post-re- calescence growth to present the full solidification process of Fe-6.5%Si （mass fraction） droplet. The droplet velocity, temperature, cooling rate as well as solid fraction profiles are simulated for droplets with different sizes to demonstrate the critical role of the size effect during the solidification process of droplets. The relationship between the simulated cooling rate and the experimentally obtained secondary dendrite arm spacing is in excellent agreement with the well-established formula. The pre-constant and exponent values lie in the range of various rapid solidified Fe-based alloys reported, which indicates the validity of the numerical model.