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Abstract The composition distribution around grain boundaries of low-chromium ferritic stainless steels was investigated by the techniques of three-dimensional atom probe and focused ion beam. It was found that Cr… Click to show full abstract
Abstract The composition distribution around grain boundaries of low-chromium ferritic stainless steels was investigated by the techniques of three-dimensional atom probe and focused ion beam. It was found that Cr atoms segregated largely (up to as much as 22.4 at.%) at grain boundaries with co-segregation of other solute atoms in the absence of Cr-carbides precipitation. The co-segregation induced the formation of a Cr-depleted zone (down to only 9.3 at.%) leading to intergranular corrosion. Based on the new mechanism, a novel concept of reducing or even preventing the grain boundary segregation to prevent intergranular corrosion at the level of dynamics/thermodynamics was proposed.
Journal Title: Corrosion Science
Year Published: 2021
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