Abstract
Abstract The effect of Al addition on the microstructural stability and intermetallic embrittlement in FeCrAl oxide dispersion strengthened (ODS) alloys was investigated in 1423 K solutionized and 748 K aged conditions by comparing their phase stability and room temperature mechanical properties. Microstructural characterization revealed that the microstructures of solutionized FeCrAl-ODS alloys containing 10 wt% Al. Contrary to this, the ordered B2 phase observed in alloys containing >20 wt% Cr and 16 wt% Al remained B2, even after prolonged ageing at 748 K. Ageing at 748 K up to 1000 h resulted in the precipitation of the ordered Fe3Al intermetallic but insignificant hardness increment in FeCrAl-ODS alloys as compared to the hardness increment due to α’ phase separation. The hardness values reached to their maxima after 100 h ageing at 748 K and thereafter either it attained a plateau or decreased slightly. Ageing also led to increase in strength and decrease in ductility due to intermetallic embrittlement; however, the loss of ductility was limited to 2–4% only.
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