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. 2020 May 20;13(10):2359. doi: 10.3390/ma13102359

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Comparison of the coefficient of friction for the material X37CrMoV5-1, ZrO₂ ball as a counterpart, and 90 N load. (a) Sample in the basic annealed state. (b) Sample after hardening and being tempered.