Crystallography of intergranular corrosion in sensitized austenitic stainless steel

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.07.014· OSTI ID:22833005

Fujii, Tomoyuki; Tohgo, Keiichiro; Mori, Yota; Shimamura, Yoshinobu ^[1]

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1. Department of Mechanical Engineering, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu 432-8561 (Japan)

Highlights: • Intergranular corrosion (IGC) in stainless steel was crystallographically discussed. • Grain boundaries (GBs) were classified based on the coincidence site lattice (CSL). • Influence of the Σ value on their IGC susceptibility had a wide range scatter. • IGC susceptibility was characterized by the Σ value and unit cell area of CSL GBs. - Abstract: This study deals with the susceptibility to intergranular corrosion (IGC) in type 304 austenitic stainless steel from a crystallographic viewpoint. An IGC test was conducted using oxalic acid and sensitized stainless steel, whose crystal orientation was analyzed by electron backscattered diffraction (EBSD). GBs were classified according to the misorientation of adjacent grains, and subclassified using the Σ value based on the coincidence site lattice (CSL) model. The width of corroded groove was measured for each GB category, and the effect of GB category on the susceptibility to IGC was examined. Then, the area of the unit cell of CSL boundaries was used to characterize the susceptibility to IGC of CSL boundaries. It was found that no IGC occurred in low-angle GBs with a misorientation of 15°, the width of corroded groove at each Σ boundary exhibited large scatter. The relationship between the width and unit cell area was characterized by a sigmoid curve, and the susceptibility to IGC was well described by the unit cell area.

• OSTI ID: 22833005
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 144; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
BACKSCATTERING
CRYSTALLOGRAPHY
CRYSTALS
ELECTRON DIFFRACTION
GRAIN BOUNDARIES
INTERGRANULAR CORROSION
STAINLESS STEELS