PSI - Issue 42

5

Petr Dymáček et al. / Procedia Structural Integrity 42 (2022) 1576–1583 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4 Grain microstructure of the FeAlOY specimens (a) rolled (b) rotary swaged

(a)

(b)

Fig. 5 Nanodispersoid of Y 2 O 3 in recrystallized FeAlOY (a) rolled (b) rotary swaged

The creep performance of the FeAlOY at 1100 °C shown in Fig. 6 is predominantly determined by the morphology of grain boundaries being the weakest link due to their limited cohesive strength. As shown in Fig. 6a the rotary swaged FeAlOY (Specimens II) has significantly higher times to rupture at same applied stress than rolled FeAlOY (Specimens I) and commercial alloy MA956. The minimum creep rates are about two orders lower for rotary swaged FeAlOY than for rolled FeAlOY as shown in Fig. 6b. Thus, the hot consolidation of the ODS powder via rotary swaging compared to rolling is clearly advantageous for production of the high-strength FeAlOY for long term applications at temperatures 1100–1300 °C.