Abstract
This paper presents the results of an experimental study of nano- and macro-scale wear in a carbo-nitrided AISI 8620 steel. Carbo-nitriding is carried out using a novel method that involves the use of dried, cyanide-containing cassava leaves, as sources of carbon and nitrogen. These are used in a pack cementation that is used to diffuse carbon and nitrogen into case layers at intermediate temperatures [673.15 K, 723.15 K, 773.15 K, and 823.15 K (400 °C, 450 °C, 500 °C, and 550 °C)]. Nano- and macro-scale wear properties are studied in the case-hardened surfaces, using a combination of nano-scratch and pin-on-disk experiments. The measured wear volumes (at both nano- and macro-length scales) are shown to increase with decreasing pack cyaniding temperature. The nano- and macro-wear resistances are also shown to be enhanced by the in situ diffusion of carbon and nitrogen from cyanide-containing bio-processed waste. The underlying wear mechanisms are also elucidated via atomic force microscopy and scanning electron microscopy observations of the wear tracks. The implications of the results are discussed for the design of hardened carbo-nitrided steel surfaces with improved wear resistance.
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Acknowledgments
The authors are grateful to the African University of Science and Technology (AUST), the National Agency for Scientific and Infrastructure (NASENI), the World Bank STEP-B project, the World Bank African Centers of Excellence Program, the African Development Bank, and the African Capacity Building Foundation for their financial support. The authors would also like to acknowledge the technical and instrumental support provided by the Nano-mechanics Research Laboratory (NRL) at Hysitron Inc., USA, and the Materials Science Laboratory, Sheda Science and Technology Complex (SHESTCO), Abuja, Nigeria.
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Arthur, E.K., Ampaw, E., Zebaze Kana, M.G. et al. Nano- and Macro-wear of Bio-carbo-nitrided AISI 8620 Steel Surfaces. Metall Mater Trans A 46, 5810–5829 (2015). https://doi.org/10.1007/s11661-015-3189-5
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DOI: https://doi.org/10.1007/s11661-015-3189-5