2025 Volume 66 Issue 771 Pages 69-72
The forward rod-backward can combined extrusion test was performed to investigate the tribological properties of duplex stainless steel during cold forging in this study. Two types of duplex stainless steel and an austenitic stainless steel were employed. The specimens were coated with a MoS2 single-bath-type environmentally friendly lubricant and oxalate and stearic acid conversion coatings. After forming, the geometries of the specimens were measured and plotted to a calibration diagram created by the finite element method to identify the Coulomb friction coefficient at the interface between a specimen and a tapered die surface. The results showed that the environmentally friendly lubricant had a lower friction coefficient for all materials. For the chemical conversion coatings, differences in friction coefficients among the materials, namely the friction coefficient of austenitic stainless steel was higher than the others were observed. This phenomenon is presumed to be due to the differing insoluble components generated during the coating process.
