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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/).
Variation of indentation hardness of tempered 5140 alloy steel tempered at 480 °C with depth under different loads before and after proton irradiation: (a) 4000 μN, (b) 6000 μN, (c) 8000 μN.