Atom probe tomography of stress corrosion crack tips in SUS316 stainless steels. (September 2015)

• Record Type: Journal Article
• Authors: Meisnar, Martina; Moody, Michael; Lozano-Perez, Sergio
• Is Part Of: Corrosion science. Volume 98(2015)
• Page Start: 661
• Page End: 671
• Publication Date: 2015-09
• Subjects: A. Stainless steel -- B. STEM -- C. Stress corrosion -- C. Intergranular corrosion -- C. Oxidation -- C. Reactor conditions; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.06.008
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Quantitative study of 3D features such as grain boundary oxides and Ni enrichment. Features can be related to their distance from the crack tip. Local measurement of compositions in very small volumes and specific regions. Complementary analytical TEM data was recorded to correlate to APT results. Both matrix elements (Fe, Cr, Ni) and oxygen diffuse along the grain boundary. Abstract: Novel atom probe tomography (APT) data of an intergranular stress corrosion crack tip has been acquired. Using APT for stress corrosion cracking research, very small, localized features and their distribution around the crack tip can be studied in 3D. This work details the development of a technique for the preparation of atom probe needles. Initial characterization via analytical transmission electron microscopy provides with a complementary analysis and accurately locates features that can be correlated with the reconstructed APT data. Ni enrichment and intergranular oxidation ahead of the crack tip have been studied with APT in 3D and with near-atomic resolution.