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Effect of arsenic content and quenching temperature on solidification microstructure and arsenic distribution in iron-arsenic alloys

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Abstract

The solidification microstructure, grain boundary segregation of soluble arsenic, and characteristics of arsenic-rich phases were systematically investigated in Fe-As alloys with different arsenic contents and quenching temperatures. The results show that the solidification microstructures of Fe-0.5wt%As alloys consist of irregular ferrite, while the solidification microstructures of Fe-4wt%As and Fe-10wt%As alloys present the typical dendritic morphology, which becomes finer with increasing arsenic content and quenching temperature. In Fe-0.5wt%As alloys quenched from 1600 and 1200°C, the grain boundary segregation of arsenic is detected by transmission electron microscopy. In Fe-4wt%As and Fe-10wt%As alloys quenched from 1600 and 1420°C, a fully divorced eutectic morphology is observed, and the eutectic Fe2As phase distributes discontinuously in the interdendritic regions. In contrast, the eutectic morphology of Fe-10wt%As alloy quenched from 1200°C is fibrous and forms a continuous network structure. Furthermore, the area fraction of the eutectic Fe2As phase in Fe-4wt%As and Fe-10wt%As alloys increases with increasing arsenic content and decreasing quenching temperature.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Wen-bin Xin, Bo Song, Chuan-gen Huang, Ming-ming Song & Gao-yang Song

  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Wen-bin Xin, Bo Song, Chuan-gen Huang, Ming-ming Song & Gao-yang Song

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  1. Wen-bin Xin
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Correspondence to Bo Song.

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Xin, Wb., Song, B., Huang, Cg. et al. Effect of arsenic content and quenching temperature on solidification microstructure and arsenic distribution in iron-arsenic alloys. Int J Miner Metall Mater 22, 704–713 (2015). https://doi.org/10.1007/s12613-015-1125-8

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  • DOI: https://doi.org/10.1007/s12613-015-1125-8

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