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Investigation of erosion-corrosion mechanisms of UNS S31603 using FIB and TEM

Record type: Article

Accelerated wear due to synergy during erosion–corrosion of UNS S31603 is extremely complex. It is this reason that current modelling approaches fail to accurately model the physical mechanisms in this wear process. The objective of this work was to perform FIB and TEM analysis on UNS S31603 to investigate the subsurface deformation mechanisms and microstructural changes in the material during erosion–corrosion. FIB investigation revealed a decrease in grain size at the surface and a change in grain orientation towards the impact direction. Networks of cracks were observed near the surface which is believed to be caused by work hardening of the material which increased the material susceptibility to fatigue cracking. Folding of lips is also proposed as an important mechanism for subsurface wear. The large amount of strain imposed on the material also induced martensitic phase transformation. Fragmented erodent particles and oxide film were found embedded into the material which caused formation stress concentrated regions in the material and contributed to crack initiation. A composite structure is formed consisting silicon oxide sand particles and chromium oxide film along with the martensitic phase transformed metal. The corrosive environment is also believed to have played a significant role in the initiation and propagation of cracks. Crack initiation and propagation due to the mechanical and electrochemical processes enhances the material mass loss as the crack networks coalesce and subsequently cause material spalling. Physical models are developed based on these observations to explain the microstructural changes and synergistic mechanisms.

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Citation

Rajahram, S.S., Harvey, T.J., Walker, J.C., Wang, S.C. and Wood, R.J.K. (2012) Investigation of erosion-corrosion mechanisms of UNS S31603 using FIB and TEM [in special issue: 37th Leeds-Lyon Symposium on Tribology Special issue: Tribology for Sustainability: Economic, Environmental, and Quality of Life] Tribology International, 46, (1), pp. 161-173. (doi:10.1016/j.triboint.2011.05.012).

More information

e-pub ahead of print date: 24 May 2011
Published date: February 2012
Keywords: slurry pot erosion tester, erosion–corrosion, fib, tem
Organisations: nCATS Group

Identifiers

Local EPrints ID: 204959
URI: http://eprints.soton.ac.uk/id/eprint/204959
ISSN: 0301-679X
PURE UUID: f68325a9-6411-413c-aad5-59193811029d
ORCID for R.J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 05 Dec 2011 13:44
Last modified: 18 Jul 2017 11:05

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Contributors

Author: S.S. Rajahram
Author: T.J. Harvey
Author: J.C. Walker
Author: S.C. Wang
Author: R.J.K. Wood ORCID iD

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