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Microstructure Evolution and Wear Resistance of Cu-Bearing Carbidic Austempered Ductile Iron after Austempering

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Abstract

The influence of the austempering process on microstructure evolution, mechanical properties, wear resistance, and corrosion resistance of Cu-bearing carbidic austempered ductile iron (CADI) was investigated. The results show that with an increase in the austempering temperature, the amount of acicular ferrite decreases, the volume fraction and carbon content of retained austenite increase gradually, the hardness and tensile strength decrease, and the impact toughness and corrosion resistance increase. Wear tests show that as the austempering temperature increases, the wear resistance of Cu-bearing CADI is improved and decreases when the temperature exceeds 300 °C. Comparing to the conventional single-step austempering process, two-step austempering process (namely added pre-quenching at 260 °C) significantly improves the wear resistance of Cu-bearing CADI by more than 16% without compromising toughness.

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Acknowledgments

The authors would like to thank the financial support for this work from National Natural Science Foundation of China under Grant (51775006).

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  1. Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology, Number 100, Pingle Garden, Chaoyang District, Beijing, 100124, People’s Republic of China

    Rong Nan, Hanguang Fu, Penghui Yang, Jian Lin & Xingye Guo

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Nan, R., Fu, H., Yang, P. et al. Microstructure Evolution and Wear Resistance of Cu-Bearing Carbidic Austempered Ductile Iron after Austempering. J. of Materi Eng and Perform 29, 2440–2459 (2020). https://doi.org/10.1007/s11665-020-04788-9

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