Abstract:

The Al-9Si-0.1Sr-0.6Mg alloy examined in this study was produced by the permanent mold casting method. The chemical composition of the produced alloy was confirmed by inductively coupled plasma atomic emission spectroscopy method. Microstructural examinations were carried out on the samples prepared by standard metallographic methods. These samples were examined without etching and photographed. In the metallographic examinations, it was observed that the microstructure of the alloy consisted of primary aluminum (Al) dendrites, eutectic Al-Si phase regions containing spherical silicon (Si) particles, primary Si particles, Al4Sr and π phases. Machinability tests were carried out under different cutting speed (250, 400 and 550 m/min), feed rate (0.05; 0.15 and 0.25 mm/rev) and constant depth of cut conditions using uncoated carbide inserts. The cutting force components were measured with the Kistler 9273 dynamometer and the average surface roughness values were measured with the Mahr Perthometer device with a tracer tip. As a result of the tests, it was determined that the cutting force, average surface roughness and built-up edge formation decreased with the increase of cutting speed, while it increased with the increase of feed rate. It was found that cutting speed of 550 m/min and feed rate of 0.05 mm/rev parameters could be used for minimum cutting force, average surface roughness and built-up edge formation.