Thermal stability of nano-structured ferritic alloy

Nanoprecipitation of oxide particles and related high strength in oxide-dispersion-strengthened iron–aluminium–chromium intermetallics

“…The rapid loss of strength of finegrained 14YWT from 500°C means that this material has similar strength to the present alloys in the most-relevant 600-800°C range. Nanocluster-strengthened alloys such as 14YWT have very fine grain size, 100-500 nm [3,4,6,7] and very large numbers of 2-5 nm sized dispersoids [1][2][3][4]. Since these nanodispersion-strengthened alloys contain many more oxide particles than the present materials (e.g.…”

“…There is a lot of interest in oxide-dispersion-strengthened (ODS) Fe-Cr alloys for structural applications at high temperatures, such as in the nuclear industry, especially for new nanostructured alloys based on Fe-Cr with small additions of Ti (and other elements) as well as Y 2 O 3 [1,2]. Such materials show outstanding high-temperature strength [3,4] and creep resistance [5][6][7][8], and are stable at high temperatures as well as under irradiation [1,9,10].…”

“…Such materials show outstanding high-temperature strength [3,4] and creep resistance [5][6][7][8], and are stable at high temperatures as well as under irradiation [1,9,10]. The high strength has been explained by contributions of matrix and grain boundaries and by strong dislocation-particle pinning [3][4][5][6][7][8].…”

The Effect of Annealing to the Hardness of High Y2O3-Oxide Dispersion Strengthened (ODS) Ferritic Steels

“…This iron-based ODS steel containing nano-scale oxide particles usually Y 2 O 3 were first introduced and prepared by using mechanical alloying methods (Fischer 1978). This kind of material shows remarkable tensile and creep properties (Alinger et al 2002;Hayashi et al 2008;Klueh et al 2002;Ukai et al 2002Ukai et al , 1993, possess higher radiation-induced swelling resistant McClintock et al 2009;Miller & Zhang 2011) and high thermal stability (Boulnat et al 2013;Ukai et al 2002) due to the presence of nano-scale oxide particles within the steel matrix (Hoeltzer et al 2007;Miao et al 2008;Susila et al 2011). …”

Impact of friction stir welding on the microstructure of ODS steel

“…This is a thermo-mechanical process that produces local temperatures between 70-90% of the melting point of the material [18,19]. The dispersed nano-scale particles present a high thermal stability during annealing up to ∼1150°C [20][21], with only a relatively small coarsening at prolonged times that is attributed to the uptake of Al by the yttrium oxide particles [22][23][24]. However, the severe plastic deformation and complex material flow caused by the FSW rotating tool as it advances along the weld line, in combination with the relatively high heat input, can potentially cause significant changes in the local microstructure of the welded zone.…”