Correlative EBSD and SKPFM characterisation of microstructure development to assist determination of corrosion propensity in grade 2205 duplex stainless steel

被引：67

作者：

Oernek, C. ^{[1
,2
]}

Engelberg, D. L. ^{[1
,2
]}

机构：

[1] Univ Manchester, Sch Mat, Mat Performance Ctr, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M13 9PL, Lancs, England

来源：

JOURNAL OF MATERIALS SCIENCE | 2016年 / 51卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

ELECTRON BACKSCATTER DIFFRACTION; PROBE FORCE MICROSCOPY; SIGMA-PHASE FORMATION; IN-SITU; NITRIDE PRECIPITATION; SECONDARY AUSTENITE; CHROMIUM NITRIDE; WORK FUNCTION; R-PHASE; BEHAVIOR;

D O I：

10.1007/s10853-015-9501-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 A degrees C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of sigma- and chi-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, sigma-phase, and inter-granular chi-phase had the largest net cathodic activity, followed by CrN and intra-granular chi-phase showing medium electrochemical activity, with ferrite and austenite (including secondary austenite) showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750 A degrees C-aged conditions with the corrosion propensity of secondary phases staying in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in light of microstructure corrosion propensity.

引用

页码：1931 / 1948

页数：18

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