Effect of hot stamping on corrosion resistance and wear resistance of selective laser melting Ti6Al4V alloy

Ti6Al4V alloy is fabricated firstly by selective laser melting （SLM） and then followed by hot stamping treatment. The corrosion resistance and wear resistance of SLM Ti6Al4V alloy before and after hot stamping treatment are comparatively studied using electrochemical corrosion and friction wear tests， and the underlying mechanisms of the performance differences are elucidated. The results indicate that in simulated body fluid， the hot-stamped SLM-formed Ti6Al4V specimens exhibit reduced corrosion resistance， with an increase in corrosion current density and a decrease in passive film thickness from 3.19 nm to 1.21 nm. The primary reason is that hot stamping causes grain coarsening in the SLM-formed Ti6Al4V specimens， with grain size increasing from 1.37 μm to 1.51 μm， and the proportion of low-angle grain boundaries rising by 1.41%， thereby accelerating the corrosion rate and degrading corrosion resistance. Additionally， the volumetric wear loss of the hot-stamped specimens increases from 0.314 mm3 to 0.474 mm3， indicating a decline in wear resistance， with the wear mechanism dominated by the combined effects of abrasive wear and oxidative wear.