Characterising hydrogen induced cracking of alloy 625+ using correlative SEM - EDX and NanoSIMS

Y. Aboura, David Fernando Martelo Guarin, R. Morana, R. Akid, K.l. Moore

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogen induced cracking behaviour of O&G nickel alloy 625+ (UNS N07716) was investigated. Deuterium was introduced electrochemically into samples by cathodic polarisation (3.5 wt.% NaCl.D2O) under different mechanical conditions. Subsequently, deuterium distributions were mapped using NanoSIMS. Deuterium was used as an isotopic tracer instead of hydrogen to avoid the detection of hydrogen artefacts. Complimentary image analysis using scanning electron microscopy (SEM) and low voltage energy dispersive X-ray (EDX) allowed the identification of microstructural features corresponding to deuterium enrichments. The results provided experimental evidence of enrichments at dislocation slip bands (DSB), twin boundary and grain boundary features that include σ precipitates.
Original languageEnglish
Pages (from-to)109228
JournalCorrosion Science
Early online date30 Dec 2020
DOIs
Publication statusE-pub ahead of print - 30 Dec 2020

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