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. 2015 Feb 16;8(2):751–783. doi: 10.3390/ma8020751

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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(a) Examples of tool wear patterns after turning of a hardened steel using a poly-crystalline boron nitride (PCBN) cutting tool; and (b) How to measure the crater depth (KT) and crater width (KB) [16].