Microstructure simulation of rapidly solidified ASP30 high-speed steel particles by gas atomization
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第3期
论文作者：Jie Ma Bo Wang Zhi-liang Yang Guang-xin Wu Jie-yu Zhang Shun-li Zhao
文章页码：294 - 302
摘 要：In this study, the microstructure evolution of rapidly solidified ASP30 high-speed steel particles was predicted using a simulation method based on the cellular automaton-finite element（CAFE） model. The dendritic growth kinetics, in view of the characteristics of ASP30 steel, were calculated and combined with macro heat transfer calculations by user-defined functions（UDFs） to simulate the microstructure of gas-atomized particles. The relationship among particle diameter, undercooling, and the convection heat transfer coefficient was also investigated to provide cooling conditions for simulations. The simulated results indicated that a columnar grain microstructure was observed in small particles, whereas an equiaxed microstructure was observed in large particles. In addition, the morphologies and microstructures of gas-atomized ASP30 steel particles were also investigated experimentally using scanning electron microscopy（SEM）. The experimental results showed that four major types of microstructures were formed: dendritic, equiaxed, mixed, and multi-droplet microstructures. The simulated results and the available experimental data are in good agreement.
Jie Ma1,2，Bo Wang1,2，Zhi-liang Yang1,2，Guang-xin Wu1,2，Jie-yu Zhang1,2，Shun-li Zhao3
1. State Key Laboratory of Advanced Special Steel, Shanghai University2. School of Materials Science and Engineering, Shanghai University3. Research Institute, Baoshan Iron & Steel Co., Ltd.
摘 要：In this study, the microstructure evolution of rapidly solidified ASP30 high-speed steel particles was predicted using a simulation method based on the cellular automaton-finite element（CAFE） model. The dendritic growth kinetics, in view of the characteristics of ASP30 steel, were calculated and combined with macro heat transfer calculations by user-defined functions（UDFs） to simulate the microstructure of gas-atomized particles. The relationship among particle diameter, undercooling, and the convection heat transfer coefficient was also investigated to provide cooling conditions for simulations. The simulated results indicated that a columnar grain microstructure was observed in small particles, whereas an equiaxed microstructure was observed in large particles. In addition, the morphologies and microstructures of gas-atomized ASP30 steel particles were also investigated experimentally using scanning electron microscopy（SEM）. The experimental results showed that four major types of microstructures were formed: dendritic, equiaxed, mixed, and multi-droplet microstructures. The simulated results and the available experimental data are in good agreement.
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