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Control of the thermomechanical processing parameters and recrystallization response of oxide dispersion strengthened (ODS) alloys is required to obtain the very high temperature properties unique to these materials. Useful strength is retained up to a relatively high fraction of the melting point due to the presence of fine uniformly dispersed, stable oxide particles. In this paper the factors affecting the development of microstructures to meet desired property goals will be discussed. The effects of powder structure, pre-cursor grain size, directional recrystallization, grain aspect ratio, γ/γ' phase proportions, dispersoid content, and texture on properties will be reviewed. Long-term stress and creep rupture data will be discussed in terms of the corresponding microstructural changes. Such studies offer an insight into our understanding of the complex and unusual creep behavior in certain ODS alloys. These and other structure-property relationships will be addressed which offer significant practical applications.
mechanical alloying, oxide dispersion strengthening, INCONEL alloy MA 6000, INCONEL alloy MA 754, INCOLOY alloy MA 956, yttrium oxide, structure, properties, gamma prime, stress rupture, creep, powder, recrystallization (directional, secondary), thermomechanical processing, tensile properties, fatigue resistance, corrosion resistance, oxidation resistance, grain growth, annealing, Alloy 51, Alloy 69, texture, threshold stress, formability
Senior Metallurgist, Inco Alloys International, Inc., Huntington, WV