Correlative EBSD and SKPFM Characterisation of Microstructure Development to Assist Determination of Corrosion Propensity in Grade 2205 Duplex Stainless Steel

Cem Oernek; Dirk L Engelberg

doi:10.1007/s10853-015-9501-3

Correlative EBSD and SKPFM Characterisation of Microstructure Development to Assist Determination of Corrosion Propensity in Grade 2205 Duplex Stainless Steel

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Abstract

Correlative Electron Backscatter Diffraction (EBSD) and Scanning Kelvin Probe Force Microscopy (SKPFM) analysis has been carried out to characterise microstructure development and associated corrosion behaviour of as-received and 750°C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of σ- and χ-phase, secondary austenite, Cr2N, and CrN after ageing treatment. SKPFM Volta potential measurements confirmed the formation of discrete reactive sites, indicating local corrosion propensity in the microstructure. Cr2N, σ-phase, and inter-granular χ-phase had net cathodic activity, with CrN and intra-granular χ-phase showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750°C aged conditions with the corrosion propensity of secondary phases in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in the light of microstructure corrosion propensity.

Original language	English
Article number	JMSC-D-15-03054
Pages (from-to)	1931-1948
Number of pages	17
Journal	Journal of Materials Science
Volume	51
DOIs	https://doi.org/10.1007/s10853-015-9501-3
Publication status	Published - 5 Jan 2016

Keywords

Duplex stainless steel; Electron Backscatter Diffraction (EBSD); Scanning Kelvin Probe Force Microscopy (SKFPM); Secondary Phases; Stress Corrosion Cracking (SCC)

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10.1007/s10853-015-9501-3

Performance Characterisation of Duplex Stainless Steel in Nuclear Waste Storage Environment
Ornek, C. (Author), Engelberg, D. (Supervisor), 1 Aug 2016
Student thesis: Phd

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@article{95ed3acf993e4c61bafad4b0118151f0,

title = "Correlative EBSD and SKPFM Characterisation of Microstructure Development to Assist Determination of Corrosion Propensity in Grade 2205 Duplex Stainless Steel",

abstract = "Correlative Electron Backscatter Diffraction (EBSD) and Scanning Kelvin Probe Force Microscopy (SKPFM) analysis has been carried out to characterise microstructure development and associated corrosion behaviour of as-received and 750°C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of σ- and χ-phase, secondary austenite, Cr2N, and CrN after ageing treatment. SKPFM Volta potential measurements confirmed the formation of discrete reactive sites, indicating local corrosion propensity in the microstructure. Cr2N, σ-phase, and inter-granular χ-phase had net cathodic activity, with CrN and intra-granular χ-phase showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750°C aged conditions with the corrosion propensity of secondary phases in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in the light of microstructure corrosion propensity.",

keywords = "Duplex stainless steel; Electron Backscatter Diffraction (EBSD); Scanning Kelvin Probe Force Microscopy (SKFPM); Secondary Phases; Stress Corrosion Cracking (SCC)",

author = "Cem Oernek and Engelberg, {Dirk L}",

note = "The authors acknowledge Radioactive Waste Management (RWM) (NPO004411A-EPS02) and EPSRC (EP/ I036397/1) for financial support. The authors are grateful for the kind provision of Grade 2205 Duplex Stainless Steel plate by Rolled Alloys. Special thanks also to Dr Christiano Padovani, Radioactive Waste Management Ltd. for valuable discussions.",

year = "2016",

month = jan,

day = "5",

doi = "10.1007/s10853-015-9501-3",

language = "English",

volume = "51",

pages = "1931--1948",

journal = "Journal of Materials Science",

issn = "0022-2461",

publisher = "Springer Nature",

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T1 - Correlative EBSD and SKPFM Characterisation of Microstructure Development to Assist Determination of Corrosion Propensity in Grade 2205 Duplex Stainless Steel

AU - Oernek, Cem

AU - Engelberg, Dirk L

N1 - The authors acknowledge Radioactive Waste Management (RWM) (NPO004411A-EPS02) and EPSRC (EP/ I036397/1) for financial support. The authors are grateful for the kind provision of Grade 2205 Duplex Stainless Steel plate by Rolled Alloys. Special thanks also to Dr Christiano Padovani, Radioactive Waste Management Ltd. for valuable discussions.

PY - 2016/1/5

Y1 - 2016/1/5

N2 - Correlative Electron Backscatter Diffraction (EBSD) and Scanning Kelvin Probe Force Microscopy (SKPFM) analysis has been carried out to characterise microstructure development and associated corrosion behaviour of as-received and 750°C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of σ- and χ-phase, secondary austenite, Cr2N, and CrN after ageing treatment. SKPFM Volta potential measurements confirmed the formation of discrete reactive sites, indicating local corrosion propensity in the microstructure. Cr2N, σ-phase, and inter-granular χ-phase had net cathodic activity, with CrN and intra-granular χ-phase showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750°C aged conditions with the corrosion propensity of secondary phases in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in the light of microstructure corrosion propensity.

AB - Correlative Electron Backscatter Diffraction (EBSD) and Scanning Kelvin Probe Force Microscopy (SKPFM) analysis has been carried out to characterise microstructure development and associated corrosion behaviour of as-received and 750°C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of σ- and χ-phase, secondary austenite, Cr2N, and CrN after ageing treatment. SKPFM Volta potential measurements confirmed the formation of discrete reactive sites, indicating local corrosion propensity in the microstructure. Cr2N, σ-phase, and inter-granular χ-phase had net cathodic activity, with CrN and intra-granular χ-phase showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750°C aged conditions with the corrosion propensity of secondary phases in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in the light of microstructure corrosion propensity.

KW - Duplex stainless steel; Electron Backscatter Diffraction (EBSD); Scanning Kelvin Probe Force Microscopy (SKFPM); Secondary Phases; Stress Corrosion Cracking (SCC)

U2 - 10.1007/s10853-015-9501-3

DO - 10.1007/s10853-015-9501-3

M3 - Article

SN - 0022-2461

VL - 51

SP - 1931

EP - 1948

JO - Journal of Materials Science

JF - Journal of Materials Science

M1 - JMSC-D-15-03054

ER -

Correlative EBSD and SKPFM Characterisation of Microstructure Development to Assist Determination of Corrosion Propensity in Grade 2205 Duplex Stainless Steel

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Keywords

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Student theses

Performance Characterisation of Duplex Stainless Steel in Nuclear Waste Storage Environment

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