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oai:recercat.cat:2117/3501552026-01-14T06:55:36Zcom_2072_1033col_2072_452950

Oxidation behavior of maraging 300 alloy exposed to nitrogen/water vapor atmosphere at 500 °C Cerra Flórez, Mauro Andrés Fargas Ribas, Gemma Mateo García, Antonio Manuel Roa Rovira, Joan Josep Universitat Politècnica de Catalunya. Doctorat en Ciència i Enginyeria dels Materials Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials Àrees temàtiques de la UPC::Enginyeria dels materials::Metal·lúrgia Oxidation Metals Maraging alloy Oxidation process Spinel Sliding properties XRD study Raman spectroscopy Oxidació Metalls Aging heat treatments in maraging steels are fundamental to achieve the excellent mechanical properties required in several industries, i.e., nuclear, automotive, etc. In this research, samples of maraging 300 alloy were aged using a novel procedure that combines different steps with two atmospheres (nitrogen and water vapor) for several hours. The oxidized surface layer was chemical, microstructural and micromechanically characterized. Due to the thermodynamic and kinetic conditions, these gases reacted and change the surface chemistry of this steel producing a thin iron-based oxide layer of a homogeneous thickness of around 500 nm. Within the aforementioned information, porosity and other microstructural defects showed a non-homogeneous oxide, mainly constituted by magnetite, nickel ferrite, cobalt ferrite, and a small amount of hematite in the more external parts of the oxide layer. In this sense, from a chemical point of view, the heat treatment under specific atmosphere allows to induce a thin magnetic layer in a mixture of iron, nickel, and cobalt spinel ferrites. On the other hand, the oxide layer presents an adhesive force 99 mN value that shows the capability for being used for tribological applications under sliding contact tests. Peer Reviewed Postprint (published version) 2021-06-24 Article Cerra, M. [et al.]. Oxidation behavior of maraging 300 alloy exposed to nitrogen/water vapor atmosphere at 500 °C. "Metals", 24 Juny 2021, vol. 11, núm. 7, p. 1021:1-1021:14. 2075-4701 https://hdl.handle.net/2117/350155 10.3390/met11071021 eng https://www.mdpi.com/2075-4701/11/7/1021 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain application/pdf Multidisciplinary Digital Publishing Institute (MDPI)