Tensile and fracture toughness properties of MA957: implications to the development of nanocomposited ferritic alloys

In-Service Design & Performance Prediction of Advanced Fusion Material Systems by Computational Modeling and Simulation

“…The results support that high toughness in NFAs can be achieved by eliminating brittle trigger particles [4] to the maximum extent possible, while maintaining fine scale isotropic grain structures. Experimental verification of these concepts is planned for the near future [25].…”

“…Ideally, NFAs would manage very high concentrations of helium, of up to 2000 appm, while exhibiting microstructural and dimensional stability at high temperatures up to 200 dpa. Further, NFAs can be developed exhibit a good balance of mechanical properties, like high creep strength and adequate fracture toughness [4]. The key characteristics of the NFAs is that they contain nm-scale precipitates of Ti-Y-Fe-O solutes, have fine to ultra-fine crystallite grain sizes and, possibly, high dislocation densities [5][6].…”

Elevated temperature ferritic and martensitic steels and their application to future nuclear reactors

“…More recently, programs were begun in the fusion reactor programs in Japan, 132 Europe, 133 and the United States. 134,135 A primary objective of these programs, as in the programs before them, is to solve the problem of the 127 "bamboo-like grain structure and a strong deformation texture" which gives rise to anisotropic mechanical properties, especially an inferior biaxial creep-rupture strength. The development programs seek to process the presently available steels (e.g., commercial MA 957-Fe-14Cr-1Ti-0.3Mo-0.25Y 2 O 3 ) to produce an equiaxed structure and explore new alloy compositions.…”

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). …”