Journal Article

High-Temperature Creep Resistance of FeAlOY ODS Ferritic Alloy

Luptáková, Natália, Svoboda, Jiří, Georgiev, Vjaceslav, Bořil, Petr, Dymáček, Petr, Jarý, Milan, Bártková, Denisa, Gamanov, Štepán

2024

Overview

A significant effort in optimizing the chemical composition and powder metallurgical processing led to preparing new-generation ferritic coarse-grained ODS alloys with a high nano-oxide content. The optimization was aimed at high-temperature creep and oxidation resistance at temperatures in the range of 1100–1300 °C. An FeAlOY alloy, with the chemical composition Fe–10Al–4Cr–4Y2O3 (wt. %), seems as the most promising one. The consolidation of the alloy is preferably conducted by hot rolling in several steps, followed by static recrystallization for 1 h at 1200 °C, which provides a stable coarse-grain microstructure with homogeneous dispersion of nano-oxides. This represents the most cost-effective way of production. Another method of consolidation tested was hot rotary swaging, which also gave promising results. The compression creep testing of the alloy at 1100, 1200, and 1300 °C shows excellent creep performance, which is confirmed by the tensile creep tests at 1100 °C as well. The potential in such a temperature range is the target for possible applications of the FeAlOY for the pull rods of high-temperature testing machines, gas turbine blades, or furnace fan vanes. The key effort now focuses on expanding the production from laboratory samples to larger industrial pieces.

• Publisher: MDPI AG,MDPI
• Subject: Alloy powders / Alloys / Chemical composition / Consolidation / Creep strength / Creep tests / Dispersion hardening alloys / Gas turbine engines / Gas-turbines / Heat resistant alloys / High temperature / Hot rolling / Oxidation / Oxidation resistance / Oxides / Powder metallurgy / Powders / Recrystallization / Rotary swaging / Sensors / Single crystals / Specialty metals industry / Swaging / Temperature / Tensile creep / Testing equipment / Turbine blades