title: Development of an oxide-dispersion-strengthened steel by introducing oxygen carrier compound into the melt aided by a general thermodynamic model.
abstract: In general, melting process is not a common method for the production of oxide dispersion strengthened (ODS) alloys due to agglomeration and coarsening of oxide particles. However, vacuum casting process has recently been employed as a promising process to produce micro-scale oxide dispersed alloys. In this paper, we report the process and characterization of in situ formation and uniform dispersion of nano-scale Y-Ti oxide particles in Fe-10Ni-7Mn (wt.%) alloy. The processing route involves a solid-liquid reaction between the added TiO2as an oxygen carrier and dissolved yttrium in liquid metal leading to an optimal microstructure with nano-sized dispersed oxide particles. The developed thermodynamic model shows the independence of the final phase constituents from experimental conditions such as melting temperature or vacuum system pressure which offers a general pathway for the manufacture of oxide dispersion strengthened materials.
authors.affiliation: School of Metallurgy and Materials Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, Iran.
authors.forename: Mohammad Amin
authors.initials: MA
authors.lastname: Moghadasi
authors.affiliation: School of Metallurgy and Materials Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, Iran.|Center of Excellence for High Performance Materials, University of Tehran, P.O. Box 14395-731, Tehran, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Nili-Ahmadabadi
authors.affiliation: School of Metallurgy and Materials Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, Iran.
authors.forename: Farsad
authors.initials: F
authors.lastname: Forghani
authors.affiliation: Department of Materials Science and Engineering (POSTECH), Pohang, 37673, South Korea.
authors.forename: Hyoung Seop
authors.initials: HS
authors.lastname: Kim