Texturing of Magnetite Forming during Long-Term Operation of a Pipeline of 10CrMo9-10 Steel

Monika Gwoździk; Zygmunt Nitkiewicz

doi:10.4028/www.scientific.net/SSP.203-204.121

Paper Titles

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Influence of Cold Plastic Deformation on the Development of the Texture in High-Manganese Austenitic Steel
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Texturing of Magnetite Forming during Long-Term Operation of a Pipeline of 10CrMo9-10 Steel
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Low-Temperature XRD Study of Phase Transformations in NiTi and TiNiCo Shape Memory Alloys Used for the Preparation of the Prototypes of Medical Implants
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XRD Based Methods of Investigation the Order - Disorder Transformation in the Spinel Structure - A Comparative Study
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Microstructure of Ni/Al₂O₃ Electrodeposited Coatings Studied with XRD and SEM Techniques
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Study of Fe₇₅Al₂₅ Alloys by the Mössbauer Spectroscopy Positron Annihilation Lifetime Spectroscopy (PALS), XRD and SEM
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Texturing of Magnetite Forming during Long-Term Operation of a Pipeline of 10CrMo9-10 Steel

Abstract:

The paper presents results of X-ray measurements of the texture of a magnetite (Fe₃O₄) layer formed on 10CrMo9-10 steel during 100,000 hours operation at the temperature of 575°C (in a flowing medium environment). The formed oxide layer was ≈140µm thick. Measurements of texturing were performed on the oxide surface and also at the depth of ≈50µm from the surface (1st polishing) and ≈100µm (2nd polishing). X-ray studies were carried out using the radiation of a cobalt anode tube, λ_Co=0.17902nm, for (311) and (400) Fe₃O₄ reflections, using a radiation beam collimated to φ=2mm. The study was aimed at determination of correlation between the texturing and the structure on the magnetite layer cross-section. A clear texturing of {111} and {111} type for the magnetite in the initial state and after the second polishing was found. Instead, after the first polishing there was a substantial texturing of {034} and {015} type. A different nature of the texture may result from a diversified morphology of magnetite at various depths (caused inter alia by a differentiated temperature on the tube wall cross-section during the material operation), which is related among other things to the crystallites size. The magnetite structure and texture changes can affect the magnetite porosity and cleavage.