PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 43 (2023) 306–311

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract Structural steels ca be used to produce barrels, due to their good pro erties. During the working cycle, steels are exp sed to aggressive conditions such s thermal stress, fatigue, and wear. In this paper, t o steels wer selected, namely 30CrNiMo8 and 42CrMo4, w ich were braded with a G40 ball be ring. All measur m nts were performed on a UMT Tri oLab universal tribo . The main goal of the xperi ent was to analyze and compare the w ar of t ol st els in contact with a b aring b ll with a dia eter of 4.76 mm. Experimental aterials will be process d for thr e types f r ug ness. Both types of exp rimental ste ls were measured after the final heat treat ent (hardening + tempering). The m in go l of the paper was to d termine how different technological surface treatment of the material will affect the abrasion resistance, and thus the life of these main materials at the point of contact with the proj c ile. Th xperime t shows that 30CrNiMo8 s el has at least the same coefficient of friction (COF) with respect to all mea urement param ters. In cont as , the s ond investigated steel, 42CrMo4, showed a decreasing COF due to the incr a ing r ess of the me surement. The friction mechanism was subject d t adhesive we r on both steels. The wear of both steels at roughn ses Sa12.5 and Sa 6.3 showed the same values. With a finer roughness of Sa 3.6, 42CrMo4 steel showed 50% lower wear values. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture Contact Fatigue Resistance of Gun Barrel Steels Miroslav Polášek a , Michal Krbaťa a , Maroš Eckert a , Pavol Mikuš a *, Róbert Cíger a a Faculty of Special Technology, Alexander Dubcek University of Trenčín, Ku kyselke 469, 911 06 Trenčín, Slovakia Abstract Structural steels can be used to produce barrels, due to their good properties. During the working cycle, steels are exposed to aggressive conditions such as thermal stress, fatigue, and wear. In this paper, two steels were selected, namely 30CrNiMo8 and 42CrMo4, which were abraded with a G40 ball bearing. All measurements were performed on a UMT TriboLab universal tribometer. The main goal of the experiment was to analyze and compare the wear of tool steels in contact with a bearing ball with a diameter of 4.76 mm. Experimental materials will be processed for three types of roughness. Both types of experimental steels were measured after the final heat treatment (hardening + tempering). The main goal of the paper was to determine how different technological surface treatment of the material will affect the abrasion resistance, and thus the life of these main materials at the point of contact with the projectile. The experiment shows that 30CrNiMo8 steel has at least the same coefficient of friction (COF) with respect to all measurement parameters. In contrast, the second investigated steel, 42CrMo4, showed a decreasing COF due to the increasing roughness of the measurement. The friction mechanism was subjected to adhesive wear on both steels. The wear of both steels at roughnesses Sa12.5 and Sa 6.3 showed the same values. With a finer roughness of Sa 3.6, 42CrMo4 steel showed 50% lower wear values. 10th International Conference on Materials Structure and Micromechanics of Fracture Contact Fatigue Resistance of Gun Barrel Steels Miroslav Polášek a , Michal Krbaťa a , Maroš Eckert a , Pavol Mikuš a *, Róbert Cíger a a Faculty of Special Technology, Alexander Dubcek University of Trenčín, Ku kyselke 469, 911 06 Trenčín, Slovakia

Keywords: Dilatometry; Tool Steel; Austenite; Microstructure Keywords: Dilatometry; Tool Steel; Austenite; Microstructure

1. Introduction In practice, different types of steel are used as the main materials (Wu et al. 2021). We have different requirements for the selection of steel to produce small-caliber barrels, which are contradictory. Regardless of the current trend, the 1. Introduction In practice, different types of steel are used as the main materials (Wu et al. 2021). We have diff rent requirements for the selection of steel to produce small-caliber barrels, which are contradictory. Regardless of the current trend, the

* Corresponding author. Tel.: +42132/7400 245 ; E-mail address: pavol.mikus@tnuni.sk * Correspon ing author. Tel.: +42132/7400 245 ; E-mail address: pavol.mikus@tnuni.sk

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.276