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Roughness and microstructure of the AMPCO 45 complex alloyed bronze eroded through cavitation

Oanca O.V., Bordeasu I., Mitelea I., Craciunescu C.M.

Journal of Achievements in Materials and Manufacturing Engineering

2014

Vol. 65, nr 2

61--67

Purpose: Paper analyses the influence between the ultrasonic cavitation erosion and the surface roughness of the complex alloyed bronze AMPCO 45 in two states: extruded and heat treated (quenched) and afterward hardened through dispersion. Design/methodology/approach: The cavitation erosion was obtained in a laboratory facility which respects integrally the indication of the ASTM G-32 Standard. Roughens profile measurements of the eroded surfaces were done with the Mitutoyo device. Findings: Supplementary, were realized scan electronic microscopy which show that the cavitation erosion begins at the interface of the two structural constituents and ends with grains expulsion from the α solid solution. Research limitations/implications: Research carried out in the Cavitation Laboratory of University Politehnica Timişoara, on naval brasses and bronzes type CuNi showed a good resistance to cavitation erosion, which can be substantially improved by various treatments. Originality/value: New researches by cavitation erosion are geared towards the development of new materials for construction of marine propellers, such as complex bronze alloys because of high mechanical properties obtained by applying such heat treatments.