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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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Worn surface of tribological couple X37CrMoV5-1–X46Cr13, (a) 30 N—annealed, (b) 30 N—hardened and tempered samples, (c) 60 N—annealed, (d) 60 N—hardened and tempered samples, (e) 90 N—annealed, (f) 90 N—hardened and tempered samples.