Identification of Chromium-Depleted Area around Chromium Nitride Precipitates in Heat-affected Zone of Lean-Duplex Stainless Steel and In-situ Observation of Preferential Dissolution by EC-AFM

Masahiro Ito; Kenya Ohashi; Kazumi Fujii; Kyoko Hombo; Katsumasa Miyazaki; Azusa Ooi; Eiji Tada; Atsushi Nishikata

doi:10.2355/isijinternational.ISIJINT-2021-462

Surface Treatment and Corrosion

Identification of Chromium-Depleted Area around Chromium Nitride Precipitates in Heat-affected Zone of Lean-Duplex Stainless Steel and In-situ Observation of Preferential Dissolution by EC-AFM

Masahiro Ito , Kenya Ohashi, Kazumi Fujii, Kyoko Hombo, Katsumasa Miyazaki, Azusa Ooi, Eiji Tada, Atsushi Nishikata

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Keywords: corrosion, stainless steel, surface analysis, welding

JOURNAL OPEN ACCESS FULL-TEXT HTML

2022 Volume 62 Issue 3 Pages 568-576

DOI https://doi.org/10.2355/isijinternational.ISIJINT-2021-462

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Abstract

A Gleeble thermo-mechanical simulator was used to simulate the welds of duplex stainless steel S32101. A micro-precipitate of chromium-nitride and its surroundings in the simulated welds was analyzed in detail by SEM/AES and EC-AFM. The AES analysis revealed that a chromium-depleted area is present in the γ phase near the chromium-nitrides precipitated at the α/γ grain boundary. The EC-AFM observation revealed that the duplex stainless steel preferentially dissolves from the chromium-depleted area.

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