Microstructure simulation of rapidly solidified ASP30 high-speed steel particles by gas atomization |
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| Authors: | Jie Ma Bo Wang Zhi-liang Yang Guang-xin Wu Jie-yu Zhang Shun-li Zhao |
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| Affiliation: | 1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China;School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;2. Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China |
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| Abstract: | 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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| Keywords: | high-speed steel rapid solidification microstructure grain growth gas atomization |
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