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Effects of Annealing on Microstructure and Microstrength of Metallurgical Coke

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Abstract

Two metallurgical cokes were heat treated at 1673 K to 2273 K (1400 °C to 2000 °C) in a nitrogen atmosphere. The effect of heat treatment on the microstructure and microstrength of metallurgical cokes was characterized using X-ray diffraction, Raman spectroscopy, and ultra-microindentation. In the process of heat treatment, the microstructure of the metallurgical cokes transformed toward the graphite structure. Raman spectroscopy of reactive maceral-derived component (RMDC) and inert maceral-derived component (IMDC) indicated that the graphitisation degree of the RMDC was slightly lower than that of the IMDC in the original cokes; however graphitisation of the RMDC progressed faster than that of the IMDC during annealing, and became significantly higher after annealing at 2273 K (2000 °C). The microstrength of cokes was significantly degraded in the process of heat treatment. The microstrength of the RMDC was lower, and of its deterioration caused by heat treatment was more severe than IMDC. The degradation of the microstrength of cokes was attributed to their increased graphitisation degree during the heat treatment.

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Acknowledgments

This project was supported by BlueScope Steel, BHP Billiton, and Australian Research Council (ARC Linkage Project LP130100701).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Xing Xing (Postdoctoral Fellow) & Oleg Ostrovski (Professor)

  2. School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Guangqing Zhang (Lecturer)

  3. BlueScope Steel, Port Kembla, NSW, 2505, Australia

    Harold Rogers (Research Associate) & Paul Zulli (Research Manager)

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  1. Xing Xing
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  2. Guangqing Zhang
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  5. Oleg Ostrovski
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Correspondence to Xing Xing.

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Manuscript submitted September 23, 2013.

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Xing, X., Zhang, G., Rogers, H. et al. Effects of Annealing on Microstructure and Microstrength of Metallurgical Coke. Metall Mater Trans B 45, 106–112 (2014). https://doi.org/10.1007/s11663-013-0002-y

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  • DOI: https://doi.org/10.1007/s11663-013-0002-y

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