Effect of Si Content on Turning Machinability of Al-Si Binary Alloy Castings

Abstract

The effect of eutectic Si or primary Si on the machinability of Al-Si alloy castings, where eutectic Si or primary Si was served to improve the chip breakability were investigated. To enhance chip breakability, eutectic Si made the chips thin, and cracks that formed in primary Si during machining acted as nuclei for chip breaking. Eutectic Si had a stronger effect on surface roughness than primary Si, and eutectic Si reduced the adhesion on the cutting edge. The decrease in adhesion on the cutting edge led to a corresponding decrease in surface roughness. The cracking of primary Si was responsible for the increase in surface roughness in hypereutectic alloys. Tool wear increased with increasing amount of eutectic Si. In hypereutectic alloys, tool wear was accelerated by the contact between the tool and cracked primary Si.

EFFECT OF SILICON CONTENT ON MACHINABILITY OF Al-Si ALLOYS

“…6-9) machinability section support each other. The data obtained from the study are in compliance with literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…In Figure 3, XRD pattern belonging to Al-Si alloys. Microstructure images and XRD pattern obtained in this study is in compliance with literature [1,[8][9][10][11]13].…”

“…It was found that chip breaks were facilitated and that this showed an effect in a form of a decrease in cutting forces thanks to the rise in Si% in alloy (due to the effect of Si). Especially in Al-Si alloy containing 12%Si, the occurrence of lower cutting force shows that Si in the structure has a positive effect on the machinability of Si [13][14][15].…”

“…Depending on the Si amount in alloy, it may be noted that silicon observed in the microstructure becoming significant/increasing facilitated chip breaking [9][10][11][12][13][14] thus showed an impact in a form of a decrease in cutting forces. From this point of view, it may be noted that the machinability of alloy increased depending on the rise in Si amount in alloy in Al-Si alloys.…”

Effect of Si content on machinability of Al-Si alloys

“…3, XRD pattern belongs to Al-Si alloys. Microstructure images and XRD pattern obtained in this study are in compliance with the literature [1,[8][9][10][11]13].…”