Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
Influence of solubilization and artificial precipitation heat treatments on microabrasive wear resistance of 6201 aluminum alloys.
Submission Author:
Clayton Rovigatti Leiva , DF
Co-Authors:
Clayton Rovigatti Leiva
Presenter: Clayton Rovigatti Leiva
doi://10.26678/ABCM.CONEM2022.CON22-0430
Abstract
Aluminum alloys provide a good relationship between mechanical strength, corrosion resistance, forming processes, lightness and cost, and find numerous applications in areas such as transportation, construction, architecture, packaging and in the electrical and electronics industry, particularly in high-voltage electrical cables. However, aluminum alloys exhibit low resistance to abrasive wear, which causes limitations in durability and performance. Heat treatment expands the use of these materials and presents itself as an effective method to improve wear resistance. The objective of this work is to study the influence of heat treatments on the microabrasive wear resistance of 6201 aluminum alloys. As preliminary tests, two samples were solubilized for 2 hours at 520 oC, and later one of them underwent artificial precipitation at 170 oC for 24 hours. The samples were submitted to Vickers microhardness (HV) tests and microabrasive test by Calowear, for 40 minutes, at 280 rpm, in the free sphere configuration, using alumina abrasive slurry (Al2O3) with an average size of 1 μm in distilled water, at a concentration of 0.40g/ml. Characterizations were performed by scanning electron microscopy (SEM) and digital optical microscopy. The means (HV) were calculated at 47.6 for the only solubilized sample and 68.0 for the solubilized and precipitated sample, resulting in a 43% increase in Vickers microhardness when the sample was subjected to precipitation. To calculate the wear coefficient, the Archard equation was used. The tests indicated a 22% improvement in the wear coefficient of the solubilized and precipitated sample, when compared to the only solubilized sample. The images obtained with SEM indicate the predominance of microbearing abrasive wear in both cases. In view of the preliminary results, it is intended to continue this work with the variation of the time of artificial precipitation in 12, 24 and 36 hours, after solubilization for 2 hours, maintaining the temperatures used in the preliminary tests. The submission times to the microabrasive test by Calowear will be 20, 30, 40, 50 and 60 minutes, aiming at the construction of curves that portray the changes caused by variations in the parameters of the heat treatments. Characterizations will be carried out by scanning electron microscopy, digital optical microscopy and X-ray microfluorescence, aiming to relate the wear mechanism, hardening and wear resistance of the alloy, as well as the distribution of elements in the matrix and the microstructure of the samples.
Keywords
Heat treatments, 6201 aluminum alloys, microabrasive wear resistance, artificial precipitation, solubilization, Calowear, microbearing
