Effect of stress-relief annealing on anodic dissolution behaviour of additive manufactured Ti-6Al-4V via laser solid forming. (June 2019)

• Record Type: Journal Article
• Authors: Li, Jiaqiang; Lin, Xin; Wang, Jian; Zheng, Min; Guo, Pengfei; Zhang, Yufeng; Ren, Yongming; Liu, Jianrui; Huang, Weidong
• Is Part Of: Corrosion science. Volume 153(2019)
• Page Start: 314
• Page End: 326
• Publication Date: 2019-06
• Subjects: Titanium -- Polarization -- EIS -- Anodic dissolution -- Laser solid forming (LSF); Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.04.002
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The effects of stress-relief annealing on LSFed Ti-6Al-4 V is characterized. The corrosion resistance relies on micro-segregation and phase content of deposit. The solutes partitioning determines the selective dissolution of α phase. The anodic dissolution mechanism is established. Abstract: Stress-relief annealing is one of the most frequently used heat treatments for additive manufactured components. The effects of the stress-relief annealing on anodic dissolution behaviour of laser solid formed Ti-6Al-4V in a 15wt.% NaCl electrolyte was investigated. The annealed Ti-6Al-4V exhibited comparatively improved resistance to dissolution compared with as-deposited one. The reduced micro-segregation resulted in the superior corrosion resistance for the annealed Ti-6Al-4V, owing to the formation of a more stable passive film and the weakened galvanic effect. The selective dissolution of α phase was lightened with the decreasing concentration difference of solutes between the refined α and β phases.