Effects of crystallographic orientation on the corrosion behavior of stainless steel 316L manufactured by laser powder bed fusion. (March 2022)

• Record Type: Journal Article
• Authors: Trisnanto, Satria Robi; Wang, Xianglong; Brochu, Mathieu; Omanovic, Sasha
• Is Part Of: Corrosion science. Volume 196(2022)
• Publication Date: 2022-03
• Subjects: Laser powder bed fusion -- Stainless steel 316L -- Crystallographic orientation -- Corrosion behavior -- Pitting corrosion -- Passive film; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.110009
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behavior of the {100}, {110}, {111} planes of a single-crystalline-like stainless steel 316L (SS316L) produced by laser powder bed fusion (LPBF) was investigated in 3.5 wt% aqueous NaCl and compared with their LPBF-polycrystalline and wrought counterparts. The general corrosion resistance followed: wrought ≈ {110} < polycrystalline < {100} < {111} trend, which was rationalized by the surface atom density and corrosion activation energy. All LPBF samples exhibited a significantly higher pitting corrosion potential than the wrought SS316L due to the lower concentration of oxygen vacancies in their passive oxide films. These findings provide insights into improving the corrosion performance by tailoring the crystallographic texture of LPBF-SS316L. Highlights: Corrosion properties of LPBF-produced single-crystalline-like SS316L. General corrosion resistance: Wrought ≈ {110} < polycrystalline < {100} < {111}. General corrosion behavior was dependent on the anisotropic surface atom density. Pitting potential of the LPBF-SS316L was by ~0.8 V higher than that of the wrought 316L. Pitting susceptibility was related to the passive film semiconducting properties.