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Microstructure simulation of rapidly solidified ASP30 high-speed steel particles by gas atomization

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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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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200072, China

    Jie Ma, Bo Wang, Zhi-liang Yang, Guang-xin Wu & Jie-yu Zhang

  2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

    Jie Ma, Bo Wang, Zhi-liang Yang, Guang-xin Wu & Jie-yu Zhang

  3. Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai, 201900, China

    Shun-li Zhao

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  1. Jie Ma
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Correspondence to Jie-yu Zhang.

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Ma, J., Wang, B., Yang, Zl. et al. Microstructure simulation of rapidly solidified ASP30 high-speed steel particles by gas atomization. Int J Miner Metall Mater 23, 294–302 (2016). https://doi.org/10.1007/s12613-016-1238-8

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  • DOI: https://doi.org/10.1007/s12613-016-1238-8

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