Austenitic Oxide Dispersion Strengthened Steels : A Review

Abstract

Materials play an important role in the fast breeder reactors. Materials used in cladding tube and fuel pins should have better creep and void swelling resistance. To overcome these difficulties, a new class of material known as oxide dispersion strengthened (ODS) steels are used. There are two groups of ODS steels, the ferritic and the austenitic ODS steels based on the matrix. The present paper reviews the current status of research in austenitic ODS steels. The interaction of dislocations with finely dispersed incoherent, hard particles that governs the strength and high temperature properties of ODS materials is briefly reviewed. The synthesis route adopted for these ODS steels, which is mostly through powder metallurgy route is also discussed. The role of various oxides such as Y2O3, ZrO2and TiO2and the clusters formed in these ODS steels on the mechanical properties and void swelling characteristics is also discussed.

Enhanced mechanical properties in oxide-dispersion-strengthened alloys achieved via interface segregation of cation dopants

“…In addition, the structural materials in future fission and fusion reactors are also challenges because of their high level of neutron displacement damage and high operating temperatures (500-1000°C) [13]. Fortunately, the high-temperature creep and tolerance to radiation damage of steels can be improved greatly by dispersing ultrafine oxide particles [14]. Due to these characteristics of ODS steels, they have been widely used as the candidate materials in fission and fusion applications.…”

Nitride Dispersion Strengthened Steel Development after Sintering of Nitrided Fe‐4.6 at% Al Alloy Powder

“…[ 7 ] The presence of strong oxide forming elements is beneficial in this regard: they help in the formation of passivating oxide films and thus diminish the oxidation rate both in the matrix and the dispersed second phases. Examples are dispersions of oxide particles such as Y 2 O 3 in stainless steels with either ferritic or austenitic matrix, [ 6,8 ] or intermetallic Ni 3 Al particles in Cr‐alloyed austenitic Ni alloys. [ 9 ] ODS steels are under extensive exploration for applications in nuclear and thermal power plants due to their excellent high temperature properties.…”

High Temperature Cyclic Plastic Response of New-Generation ODS Alloy

“…Most experiments in the literature concerning ODS alloys have focused mainly on the description of the microstructure evolution at elevated temperature [5,7,8], tensile tests [9], and creep properties [10], but results concerning the fatigue behavior are rather rare. The effect of cyclic loading was monitored in [11] using the three-point bending fatigue test at cycle asymmetry ratio R = 0.1 at ambient temperature.…”