On the role of chromium in minimizing room temperature hydrogen embrittlement in iron aluminides
Journal Article
·
· Scripta Materialia
- Indian Inst. of Tech., Kanpur (India). Dept. of Materials and Metallurgical Engineering
It has been well established that the poor room temperature ductility of iron aluminides is due to hydrogen embrittlement (HE). Intermetallics, of composition Fe{sub 3}Al and FeAl, can become commercially attractive if the hydrogen embrittlement problem in these materials can be overcome. These intermetallic materials are ideal for application in high temperature fossil fuel fired energy conversion systems due to their superior oxidation and sulfidation resistance, and most importantly, low cost. The effect of Cr additions on the hydrogen embrittlement behavior of iron aluminides is addressed in this paper from an electrochemical viewpoint. The importance of hydrogen liberation rates in affecting HE would be clearly seen. The possible HE mechanism will also be considered. Finally, a possible criterion for the selection of alloying elements (other than the normally reported Cr) to provide enhanced room temperature ductilities to iron aluminides will be outlined.
- OSTI ID:
- 186779
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 1 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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