Coatings on Steels T91 and 316L in Lead-Bismuth Eutectic Environment

The work is aimed on the coatings used as a barrier against Heavy Liquid Metal (HLM) influence and coated material behaviour under mechanical loading. The comparison of two kinds of coatings deposited on two different steels is examined: ferritic-martensitic steel T91 coated with AlTiN and austeniti...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-12, Vol.461 (1), p.12028
Main Authors: Chocholousek, M, Rozumova, L, Spirit, Z, Gabriele, F Di
Format: Article
Language:English
Subjects:
Aluminum oxide
Austenitic stainless steels
Bismuth
Coatings
Corrosion effects
Corrosion prevention
Cracking (fracturing)
Damage localization
Eutectic temperature
Ferritic stainless steels
Heat resistant steels
Liquid metals
Martensitic stainless steels
Steel
Substrates
Tensile tests
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Summary:The work is aimed on the coatings used as a barrier against Heavy Liquid Metal (HLM) influence and coated material behaviour under mechanical loading. The comparison of two kinds of coatings deposited on two different steels is examined: ferritic-martensitic steel T91 coated with AlTiN and austenitic steel 316L coated with Al2O3. Both samples underwent tensile tests with constant extension rate in the HLM autoclave-cell for material testing. The testing environment in the cell was liquid PbBi eutectic at the temperature of 550 °C. The examination by Scanning electron microscopy and Energy-dispersive X-ray spectroscopy followed after exposure. The yield strength of the steel was exceeded in both cases, cracks and adhesion were studied in depth to characterize their resistance to the simultaneous effect of load and environment. Both coatings offered protection against corrosion; however, localized cracking gave rise to the damage of the substrate. These coatings provided a corrosion barrier, which once damaged is not able of self-healing.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/461/1/012028