Study of the Properties of C92900 Bronze Obtained by Permanent Mold Casting, Upward Casting, and Hot Extrusion

Bazhenov, V.E.; Titov, A.Y.; Shkalei, I.V.; Sannikov, A.V.; Tavolzhanskii, S.A.; Mezrin, A.M.; Koltygin, A.V.; Nikitina, A.A.; Plisetskaya, I.V.; Belov, V.D.; Yudin, V.A.

Авторы: Bazhenov V.E., Titov A.Yu, Shkalei I.V., Sannikov A.V., Tavolzhanskii S.A., Mezrin A.M., Koltygin A.V., Nikitina A.A., Plisetskaya I.V., Belov V.D., Yudin V.A.
Журнал: Russian Journal of Non-Ferrous Metals
Том: 62
Номер: 4
Год издания: 2021
Первая страница: 413
Последняя страница: 423
Оригинальные версии: Исследование свойств бронзы БрО10С2Н3, полученной наполнительным литьем, непрерывным литьем вверх и горячей экструзией
DOI: 10.3103/S1067821221040040
Аннотация: Antifriction tin bronzes and, in particular, C92900 bronze are used in mechanical engineering tomanufacture parts subject to friction. Permanent mold casting into steel molds is commonly used to produceparts from C92900 bronze. The feasibility of producing C92900 bronze rods by hot extrusion and upwardcasting methods is explored. The hot extrusion temperature and the upward casting rate at which defects donot emerge in rods is determined. Hot extrusion is shown to result in a significant refinement of grains downto 1.7 μm, while upward casting, on the contrary, results in an increase in the grain size in comparison withpermanent mold casting. Regarding microstructure, γ-Cu3Sn intermetallic phase crystals are refined in hotextrusion and continuous upward casting. Large clusters of particles (Pb) can be observed in the extrudedbronze microstructure, which presumably lead to a decrease in the coefficient of friction. Maximum hardnessand tensile strength are characteristic of the rods produced by hot extrusion at 600°C, while the highest elongationis obtained in the rods produced by upward casting. Tribological studies conducted using the “shaft–partial insert” setup in a kerosene medium with a steel counter body show that hot extrusion leads to a tenfoldincrease in wear resistance and a threefold decrease in the coefficient of friction in comparison with the rodsobtained by permanent mold casting. The rods obtained by the upward casting method, on the contrary,exhibit a decrease in wear resistance. Given these results, hot extrusion may be recommended along with thecasting technique for manufacturing bronze C92900 rods.
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Study of the Properties of C92900 Bronze Obtained by Permanent Mold Casting, Upward Casting, and Hot Extrusionстатья

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