Passive behavior of laser directed energy deposited Inconel 718 after homogenization and aging heat treatment. (15th August 2022)

• Record Type: Journal Article
• Authors: Zhang, Yufeng; Yu, Jun; Lin, Xin; Guo, Pengfei; Yu, Xiaobin; Zhang, Shaoli; Liu, Jianrui; Huang, Weidong
• Is Part Of: Corrosion science. Volume 205(2022)
• Publication Date: 2022-08-15
• Subjects: Additive manufacturing -- Laser directed energy deposition -- Inconel 718 -- Passive film -- Ions transportation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110439
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Microstructure and passive behavior of laser directed energy deposited Inconel 718 after homogenization and aging heat treatment were investigated. The deposit microstructure mainly consists of γ phase and (γ + γ″) phases after homogenization and homogenization + aging treatment, respectively. Both heat-treated samples present a similar trend on passive behavior within the potential ranging. However, compared to homogenization treatment, the passive film of the deposit exhibits a lower electrochemical stability after homogenization + aging treatment, which is caused by the accelerated ions transportation through the interface between γ″ phase and passive film. Highlights: γ″ phases precipate in laser directed energy deposited (LDED) Inconel 718 after "homogenization + aging" heat treatment. Both heat-treated LDED Inconel 718 samples perform a similar trend on the passive behavior within the potential ranging. The ions transportation is facilitated by the interface between γ″ phase and passive film.