City Research Online

Effect of NaCl and SO2 on the stress corrosion cracking of CMSX-4 at 550°C

Duarte Martinez, F., Syed, A., Dawson, K. , Tatlock, G. J., Morar, N. ORCID: 0000-0001-9109-8864, Kothari, M., Tang, C., Leggett, J., Mason-Flucke, J. C., Gibson, G., Nicholls, J. R., Gray, S. & Castelluccio, G. M. (2023). Effect of NaCl and SO2 on the stress corrosion cracking of CMSX-4 at 550°C. Materials at High Temperatures, 40(4), pp. 283-295. doi: 10.1080/09603409.2023.2205760


In the pursuit of more efficient gas turbine engines, components are required to operate for longer times at elevated temperatures. This increased time in service, together with a complex loading regime, can expose the material to environmental attack. This work has demonstrated that the interaction of stress, NaCl and a sulphur-containing environment is critical to cause crack initiation in the early stages of the exposure and accelerated corrosion rates in CMSX-4 at 550°C. The effect of having small concentrations of moisture in the gaseous environment or as water crystallisation in the salt is still to be investigated. A working hypothesis is that the interaction of alkali chlorides with a sulphur-containing atmosphere is the trigger to a self-sustaining cycle where metal chloride formation, vaporisation and oxidation lead to high amounts of hydrogen injection in a rapid manner and, therefore, hydrogen embrittlement.

Publication Type: Article
Additional Information: © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.
Publisher Keywords: CMSX-4, C-ring, Hot corrosion, FactSage 8.1
Subjects: Q Science > QD Chemistry
T Technology > TS Manufactures
Departments: School of Science & Technology > Engineering
SWORD Depositor:
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