Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment Part III: Combination with Electrospark Alloying Applied to Additively Manufactured Ti-6Al-4V Titanium Alloy

Scanning electron microscopy, 3D optical surface profilometry, as well X-ray diffraction and backscatter analysis were implemented for studying the effects of both ultrasonic impact treatment (UIT) electrospark (UIET) procedures on microstructure, phase composition, mechanical tribological properties Ti-6Al-4V samples fabricated by wire-feed beam additive manufacturing. It was shown that he UIET procedure with WC-6%Co striker enabled to deposit ~10 µm thick coating, which consists fine grains tungsten titanium-tungsten carbides, titanium oxide. For process, effect shielding gas studied parameters demonstrated. found in argon resulted formation a dense, continuous (~20 µm) coating. After air argon, microhardness levels 26 16 GPa, respectively. tests, wear track surfaces examined as-built sample, ones subjected UIT procedures. coating formed during had twice resistance compared argon. The evidence showed multiple WC-Co simultaneous electrical discharges an effective way improve sample.