X‐ray computed tomography study of microstructure weakening by high‐temperature hydrogen attack on refractories

X‐ray computed tomography (XRT) is a three‐dimensional (3D), non‐destructive, and reproducible investigation method capable of visualizing and examining internal and external structures of components independent of the material and geometry. In this work, XRT with its unique abilities complements co...

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Bibliographic Details
Published in:International journal of ceramic engineering & science 2024-05, Vol.6 (3), p.n/a
Main Authors: Razavi, Anita, Henn, Isabelle, Sax, Almuth, Quirmbach, Peter
Format: Article
Language:English
Subjects:
Aluminum oxide
Computed tomography
Corrosion
Corrosion tests
Emissions
Greenhouse gases
High temperature
Hydrogen
Investigations
Microstructure
Nondestructive testing
Porosity
Refractories
Scanning electron microscopy
Sensors
Silicon dioxide
Software
Spatial distribution
Steel industry
Steel production
Tomography
X-rays
X‐ray computed tomography
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Summary:X‐ray computed tomography (XRT) is a three‐dimensional (3D), non‐destructive, and reproducible investigation method capable of visualizing and examining internal and external structures of components independent of the material and geometry. In this work, XRT with its unique abilities complements conventionally utilized examination methods for the investigation of microstructure weakening induced by hydrogen corrosion and furthermore provides a new approach to corrosion research. The motivation for this is the current inevitable transformation to hydrogen‐based steel production. Refractories of the system Al2O3‐SiO2 are significant as lining materials. Two exemplary material types A and B, which differ mainly in their Al2O3:SiO2 ratio, are examined here using XRT. Identical samples of the two materials are measured, analyzed, and then compared before and after the hydrogen attack. In this context, hydrogen corrosion‐induced porosity and its spatial distribution and morphology are investigated. The results show that sample B has a higher resistance to hydrogen‐induced attack than sample A. Furthermore, the 3D representation revealed a differential porosity increase within the microstructure. The paper focuses on the evaluation of the microstructure weakening by hydrogen‐induced attack of two exemplary Al2O3‐SiO2 refractories. X‐ray computer tomography (XRT) is used to spatially resolve and investigate the hydrogen corrosion‐induced porosity as well as its distribution and morphology. The non‐destructive nature of XRT allows the examination of identical samples before and after hydrogen attack to investigate the influence on the microstructure in three dimensions, thus complementing the information provided by conventional methods.
ISSN:2578-3270
2578-3270
DOI:10.1002/ces2.10211