Abstract
Iron-based precipitation hardened superalloys are being considered for use as structural materials in Fast Breeder Reactors due to their high temperature strength. Appropriate application of these materials requires an understanding of the microstructural stability of precipitation hardening phases in the radiation damage environment. It is not yet clear whether irradiation will affect precipitate stability in-reactor; a whole host of possible behaviors have thus far been considered (1). Transmission electron microscopy appears to be the technique best suited for evaluating precipitate stability. Precipitate sizes in these alloys range from a few atom diameters to several microns, well within the range of state-of-the-art electron microscopy techniques.An example of the complexity of reactor-induced gamma prime precipitation for these materials is provided in Fig. 1. Nimonic PE16 (Fe-44Ni-15Cr-lAl-lTi-3Mo) is a precipitation hardened commercial alloy containing aluminum and titanium additions in order to develop the coherent gamma prime phase for improved strength.
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