Due to its relative hardness to other materials, duplex stainless steel 2205 is difficult to cut. Sustainable machining is thus used to increase machinability. In this work, drills coated with TiAlN (Titanium aluminium nitrate) were utilized to drill into duplex stainless steel (DSS) 2205 under dry, minimum quantity of lubrication (MQL), and liquid carbon dioxide machining conditions (LCO₂). The Taguchi-TOPSIS approach is used for parametric optimization after experimental work. Finally, it was discovered that a liquid carbon dioxide (LCO₂) cooling environment, a high spindle speed (1120 rpm), and a low feed rate (0.02 mm/rev) are the ideal process parameters for drilling on DSS 2205 in multiobjective. This is because selecting the right process parameters has a significant impact on manufacturing process efficiency.

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