Heat treatment of additively manufactured Ti-6Al-4V alloy: Microstructure and electrochemical properties

The effects of heat treatment on the microstructure of additively manufactured (AM) Ti-6Al-4V were investigated. The relationship between the microstructure characteristics and the surface activity of AM Ti6Al-4V was explored. Electrochemical analysis results revealed that AM Ti-6Al-4V annealed at 940 degrees C exhibited a stronger ability to corrosion resistance, followed by an alloy cooled at 1020 degrees C. The Ti-6Al-4V alloy with aging treatment at 540 degrees C showed a higher corrosion rate. The difference in the corrosion rate of the specimens was obtained through corrosion experiment conducted using a 0.5 mol L-1 hydrochloric acid hydrofluoric acid solution, and the results of the initial stage of immersion were consistent with the electrochemical measurements. Variations in the phase content and texture were the main factors affecting the corrosion resistance of Ti-6Al-4V. An increase in the beta phase and a decrease in the alpha' grains were beneficial to improving the corrosion resistance performance. Specimens with a higher <110> was considered a critical factor in improving the corrosion resistance of AM Ti-6Al-4V alloy. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Research showed that AM Ti-6Al-4V annealed at 940 degrees C exhibited stronger corrosion resistance, while Ti-6Al-4V alloy with aging treatment had a higher corrosion rate. The variations in phase content and texture were identified as the main factors affecting the corrosion resistance of Ti-6Al-4V alloy.