Journal
ACTA MATERIALIA
Volume 201, Issue -, Pages 131-146Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.09.058
Keywords
High temperature oxidation; Nitridation; Alumina scale failure; Crystallographic orientation; Reactive elements
Funding
- Swedish Research Council
- Royal Swedish Academy of Engineering
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Two high-temperature FeCrAl and FeNiCrAl alloys were exposed in a strongly nitriding environment at 900 degrees C and the morphology of nitridation was studied. Quasi-in-situ experiments revealed that nitridation started at specific surface sites directly related to the alloy microstructure where the alumina scale was permeable to nitrogen. FeCrAl alloy grains with (112) orientation formed outward-growing alumina scales and were susceptible to nitridation. Outward-growing scales and substrate nitridation was also observed at chromium carbide precipitates in the FeNiCrAl alloy. Both alloys suffered nitridation at reactive element-rich (Y and Zr) inclusions larger than a certain critical size. The latter type of attack is caused by cracks and pores in the scale. The findings open new avenues of research for developing the next generation of high temperature alloys with superior properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
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