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. 2021 Sep 8;14(18):5160. doi: 10.3390/ma14185160

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Microstructural characteristics of sample 34/A. Heat B: (a) quenched and tempered microstructure around crack; segregation bands of darker contrast correspond with the forming direction. (b) Detail of quenched and tempered microstructure consists of bainite, small islands of ferrite, perlite; segregation band of darker contrast is located in the center of the figure. (c) Detail of tempered bainite, ferrite (white islands), perlite (black areas); (d) detail of the microstructure in the segregation band; (e) surroundings of cracks; detail of quenched and tempered microstructure consists of bainite, small white islands of ferrite, black areas of perlite.

Microstructural characteristics of sample 34/A. Heat B: (a) quenched and tempered microstructure around crack; segregation bands of darker contrast correspond with the forming direction. (b) Detail of quenched and tempered microstructure consists of bainite, small islands of ferrite, perlite; segregation band of darker contrast is located in the center of the figure. (c) Detail of tempered bainite, ferrite (white islands), perlite (black areas); (d) detail of the microstructure in the segregation band; (e) surroundings of cracks; detail of quenched and tempered microstructure consists of bainite, small white islands of ferrite, black areas of perlite.