Abstract
The work presented in this paper studied the tribological characteristics (wear resistant, friction coefficient) of austempered ductile iron (ADI) with different combinations of structural composition (upper bainite, lower bainite, retained austenite) in dry sliding friction. A range of structural states of the metal matrix was obtained by changing the regimes of isothermal quenching of a high-strength cast iron. The tribological tests were carried out using two sets of isothermal quenched cast irons. After austenitization at 900 ℃ for 60 min, the specimens from the first group were isothermal quenched at the 300 ℃ temperature and the specimens from the second set – at 400 ℃.
The investigations showed that the isothermal quenching increases the friction coefficient of high strength cast irons. The friction coefficient was found to be in the range from 0.4 to 0.55 for cast irons depending on the structures of the metal matrix. The quenched cast irons having lower bainite demonstrate higher wear resistance in dry friction conditions. The dependence of wear resistance on the amount of retained austenite in isothermal quenched cast irons has a nonlinear characteristic and reaches its maximum value when the content of retained austenite was about 15–22%. The boron micro-additives allowed to reduce the friction coefficient of ADI and increase their wear resistance by 1.5–1.7 times.
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Khidasheli, N., Gordeziani, G., Gvazava, S., Tavadze, G., Tabidze, R., Batako, A.D.L. (2022). Influence of Structural Parameters on the Wear Resistance of ADI During Dry Sliding Friction. In: Batako, A., Burduk, A., Karyono, K., Chen, X., Wyczółkowski, R. (eds) Advances in Manufacturing Processes, Intelligent Methods and Systems in Production Engineering. GCMM 2021. Lecture Notes in Networks and Systems, vol 335. Springer, Cham. https://doi.org/10.1007/978-3-030-90532-3_9
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DOI: https://doi.org/10.1007/978-3-030-90532-3_9
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