PSI - Issue 65

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000

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ScienceDirect

Procedia Structural Integrity 65 (2024) 282–289

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) The influence of small additives on the structure and properties of brass A.V. Sulitsin a, *, S.V. Brusnitsyn a , D.O. Levin a,b , D.A. Usov a,b , V.K. Dubrovin c a Ural Federal University named after the first President of Russia B.N. Yeltsin, 19 Mira St., Ekaterinburg, 620062, Russia b LLC LD PRIDE, 56 Eniseiskaya St., Chelyabinsk, 454010, Russia c South Ural State University (national research university), 76 Lenin prospect, Chelyabinsk, 454080, Russia The paper is devoted to research of the modifiers influence on the structure and properties of complex alloyed brass with a composition 70Cu-13Zn-7Mn-5Al-2Fe-2Si-1Pb. Mischmetal, magnesium-cerium, iron-boron, iron-titanium, niobium ligatures were used as modifiers. Laboratory and industrial experiments have been carried out. The macrostructure and microstructure of the ingots have been studied. The greatest effect on grain refinement was obtained using a magnesium-cerium ligature. It was found that when the magnesium-cerium ligature was introduced, there were no intermetallic accumulations, the average size of which did not exceed 80 μm. In order to facilitate the alloying of the modifier into the melt, it was proposed to use a nickel magnesium-cerium alloy, since a significant amount of a fine fraction is formed during its production. The use of nickel magnesium-cerium ligature as a modifier for complex alloyed brass is one of the possible options for using its fine fraction. The ligature amount was varied within 0.01...0.20 % of the melt mass. The experiments results showed that if the modifier amount increases, the average grain size decreases by more than two times. In this case, the average grain size does not change if the modifier amount is more than 0.1 wt. %. The influence of the modifier amount on the mechanical properties of complex alloyed brass has been studied. It was found that there is an increase in the ultimate tensile strength and elongation if a modifier is introduced in an amount of up to 0.05 wt. %. The dependence of hardness on the amount of the introduced modifier is determined. It has been found that the higher the added modifier amount, the higher the alloy hardness. The amount of the modifier is determined as 0.04...0.06 wt. %. It provides an increase in the level of mechanical properties of complex alloyed brass. Micro X-ray spectral analysis of the brass was carried out. The elements distribution in the α-phase, (α+β')-phase and intermetallic compounds in the test and control ingots structure has been studied. It was found that when the modifier is introduced in an amount of 0.05 wt. %, copper and zinc are present in significant amounts in the alloy structure in the α-phase Abstract

* Corresponding author. Tel.: +7-950-200-33-47. E-mail address: sulitsin@mail.ru

2452-3216 © 2024 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 responsibility of MRDMS 2023 organizers

2452-3216 © 2024 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 responsibility of MRDMS 2023 organizers 10.1016/j.prostr.2024.11.042