Elucidating the grain-orientation dependent corrosion rates of austenitic stainless steels

Shiqi Dong; Xin Chen; Erika Callagon La Plante; Maxim Gussev; Keith Leonard; Gaurav Sant

Materials & Design (Jun 2020)

Elucidating the grain-orientation dependent corrosion rates of austenitic stainless steels

Shiqi Dong,
Xin Chen,
Erika Callagon La Plante,
Maxim Gussev,
Keith Leonard,
Gaurav Sant

Affiliations

Shiqi Dong: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA; Institute for Carbon Management (ICM), University of California, Los Angeles, CA, USA
Xin Chen: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA
Erika Callagon La Plante: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA; Institute for Carbon Management (ICM), University of California, Los Angeles, CA, USA
Maxim Gussev: Oak Ridge National Laboratory, Oak Ridge, TN, USA
Keith Leonard: Oak Ridge National Laboratory, Oak Ridge, TN, USA
Gaurav Sant: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA; Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA; California Nanosystems Institute (CNSI), University of California, Los Angeles, CA, USA; Institute for Carbon Management (ICM), University of California, Los Angeles, CA, USA; Corresponding author at: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA.

Journal volume & issue: Vol. 191

Abstract

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The dependence of oxidation rates on grain orientation has been observed for austenitic alloys suggesting crystallographic control of such processes. To better understand these observations, the active and transpassive oxidation behaviors of an austenitic AISI 316L stainless steel were investigated using vertical scanning interferometry (VSI). The oxidation rates of >100 unique grains were measured and related to their crystallographic orientations (i.e., with respect to the surface normal direction) as identified using electron backscatter diffraction (EBSD). The oxidation rates follow a scaling that is given by: {001} < {101} < {111} for grains undergoing both active and transpassive oxidation. The corrosion tendencies of {001} and {101} grains indicate that the activation energy of dissolution follows a scaling similar to that of the surface energy. However, the high corrosion rates of {111} grains, which feature a surface energy lower than those of the {001} and {101} grains, is attributed to their lower tendency to adsorb passivating species, from solution, that leads to a net reduction in the activation energy of oxidation. These insights provide improved understanding of the crystallographic controls of oxidation processes, and thereby suggest processing pathways for enhancing the oxidation resistance of stainless steels.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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