Effect of aluminum on the FeCr(Al) alloy oxidation resistance in steam environment at low temperature (400 °C) and high temperature (1200 °C)

Understanding oxidation of Fe-Cr-Al alloys through explainable artificial intelligence

“…In the experimental literature of FeCrAl oxidation, the addition of Al and Cr has been proven to form thin oxide scale at both high and low temperatures. [21] If Mo is present, it forms a thick oxide scale at low temperature, making the alloy unprotective of oxidation. [21] Such understandings are drawn from expensive experimental characterization like scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of different FeCrAl compositions.…”

“…[21] If Mo is present, it forms a thick oxide scale at low temperature, making the alloy unprotective of oxidation. [21] Such understandings are drawn from expensive experimental characterization like scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of different FeCrAl compositions. Gaining similar insight from specific mass change data only is new to the community and can provide meaningful insight from inexpensive and high-throughput tests if XAI is used correctly.…”

“…The details of the experimental test condition were provided in Ref. [21] . The wt% of Fe, Cr, Al, Mo, and Ni are selected as input features for predictive model building along with oxidation temperature and test duration.…”

“…[17] This poses the challenge of designing alloys with both high and low temperature oxidation resistance for short and long exposure, respectively. In the past, a consistent experimental effort, especially at high temperature, [12,18,20,21] has been noticed to optimize FeCrAl composition for nuclear applications, but a computational predictive modeling is rare. Previously, we have built predicative models for oxidation mass gain based on FeCrAl alloy composition and oxidation conditions.…”

Elucidating Precipitation in FeCrAl Alloys through Explainable AI: A Case Study

“…Ferritic (FeCrAl) alloys with high Cr (>=12 wt.%) and Al (~5 wt. %) content have been extensively studied as accident tolerant material suitable for nuclear cladding applications due to their proven superior hydrothermal corrosion resistance at normal operating conditions (~300° C) and excellent high temperature (~1000° C) steam oxidation resistance [1,2]. Ferritic stainless alloys (including FeCrAl), however, may suffer from aging embrittlement at 475°C [3] approximately which could affect performance of FeCrAl alloys in industrial environments.…”