Corrosion behavior of selective laser melted Ti-6Al-4 V alloy in NaCl solution

• DOI: 10.1016/j.corsci.2015.10.041
• Publication Date: 2015-11-02T02:32:08Z
• Authors: Nianwei Dai; Lai-Chang Zhang; Junxi Zhang; Qimeng Chen; Maoliang Wu
• Keywords: Acicular; Selective Laser Melting

Abstract Electrochemical measurements were performed to investigate the corrosion behavior of Ti-6Al-4 V alloy prepared by selective laser melting (SLM) and commercial Grade 5 sample for comparison. Electrochemical results showed that the SLM-produced sample possesses poorer corrosion resistance than the Grade 5 sample. Microstructure studies suggested that the SLM-produced sample is composed of dominant acicular α’ martensite and some prior β grains, unlike the typical α + β microstructure in Grade 5 sample. The unfavorable corrosion resistance of the SLM-produced sample is related to the considerably large amount of acicular α ’ and less β –Ti phase in the microstructure compared to the Grade 5 sample.