Role of PVD oxide coatings on HK40 cast steel during short and long exposure to C-rich atmospheres

The role of Cr/Cr oxide thin film coatings on HK40 steel substrates during exposure to C-rich atmospheres was investigated. The coatings were produced via reactive magnetron sputtering as an alternative method to protect these materials against metal dusting. Coated and uncoated substrates were expo...

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Bibliographic Details
Published in:Materials characterization 2013-09, Vol.83, p.58-67
Main Authors: Salas, O., Melo-Máximo, D.V., Oseguera, J., Reichelt, R.
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheres
Austenitic stainless steels
Chromium
Coating
Coatings
Corrosion
Corrosion prevention
Cross-disciplinary physics: materials science
rheology
Diffusion
Exact sciences and technology
Exposure
Heat resistant steels
Iron
Materials science
Metal dusting
Metals. Metallurgy
Nickel
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Production techniques
Protective coatings
Reactive magnetron sputtering
Solidification
Surface treatment
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Summary:The role of Cr/Cr oxide thin film coatings on HK40 steel substrates during exposure to C-rich atmospheres was investigated. The coatings were produced via reactive magnetron sputtering as an alternative method to protect these materials against metal dusting. Coated and uncoated substrates were exposed at 1073K to an Ar+CH4 atmosphere with residual oxygen for 10, 30, 60min and 50h. Analysis of the products formed on both samples indicated that attack in the uncoated samples involves both C and O from the atmosphere together with Cr, Fe, and Ni outward diffusion in which the dendritic structure plays an important role. The presence of even a residual amount of oxygen in the carburizing atmosphere had a remarkable effect on the corrosion mechanism in these samples as well. In the coated samples, the Cr/Cr oxide film minimized internal alloy attack not only by limiting carbon ingress, but also minimizing the role of oxygen and outward Cr (Fe and Ni) diffusion from the alloy. •We examine changes in the microstructure from HK40 steel after carburizing test.•We coated substrates with Cr/Cr Oxide to prevent carburization.•The coating of oxide acting as a barrier of C inward and Cr outward diffusion
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2013.05.016