MIREA – Russian Technological University (Moscow, Russia)
Е. S. Кozik, Associate Professor of the Department of Materials Engineering, Candidate of Technical Sciences, ele57670823@yandex.ru
А. А. Lukyanova, Student of the Department of Materials Science, lukyanovanastasiya@gmail.com

Orenburg State University named after V. A. Bondarenko (Orenburg, Russia)

Е. V. Svidenko, Associate Professor of the Department of Materials Science and Technology, Candidate of Technical Sciences, tzvetkova.katia2016@yandex.ru

Chromium bronzes of the Cu – Cr system are heat-treatable low-alloyed alloys. The structure, mechanical properties, and application areas of sheets made of BrKh08 alloy are determined by their manufacturing technology. Heat treatment is used to improve the mechanical properties of chromium bronzes; however, the heat treatment conditions for heat-resistant chromium-containing copper alloys have not been sufficiently studied. This paper presents a study of the effect of manufacturing and heat treatment conditions on the mechanical properties of cold-rolled sheets made of the heat-resistant copper alloy BrKh08Sh, manufactured at JSC Metallurgical Plant “Elektrostal.” To improve the service properties of the BrKh08Sh copper alloy, various heat treatment procedures have been investigated. The heat treatment of BrKh08Sh alloy specimens has included quenching followed by aging. Quenching and aging have been carried out in an LAC PK 105/12 chamber furnace. Aging has been performed at different temperatures to investigate the effect of heat treatment on the structure and mechanical properties of the BrKh08Sh alloy. The results of mechanical testing of BrKh08Sh alloy specimens are presented, including strength, hardness, and elongation. The microstructure of the BrKh08Sh alloy specimens subjected to different heat treatment conditions has been analyzed to identify structural features affecting their mechanical properties. The Thixomet® Pro image analysis software has been used to quantify the refinement of polygonal chromium particles. The average chromium particle size after different treatments ranges from 13.78 to 21.60 μm. Increasing the aging time from 30 min to 6h and the aging temperature from 450 to 475 °C has resulted in an increase in both the size and number of chromium precipitates, which has contributed to an increase in hardness and tensile strength.

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