High-temperature oxidation performance of a new alumina-forming Ni–Fe–Cr–Al alloy in flowing air

• Published in: International journal of hydrogen energy 2011-04, Vol.36 (7), p.4580-4587
• Main Authors: Deodeshmukh, V.P., Matthews, S.J., Klarstrom, D.L.
• Format: Article
• Language: English
• Subjects: Alloy development; Alternative fuels. Production and utilization; Alumina- and chromia-forming alloys; Aluminum oxide; Applied sciences; Energy; Exact sciences and technology; Ferrous alloys; Flowing air; Fuels; Heat resistant alloys; HR-224 alloy; Hydrogen; Intermetallic compounds; Nickel base alloys; Oxidation; Oxidation resistance; Scale (corrosion)
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2010.04.099

A new type of alumina-forming Ni–Fe–Cr–Al-based alloy (HAYNES ® HR-224™ alloy) has been recently developed for aggressive oxidizing environments. This paper evaluates cyclic oxidation resistance of newly developed HR-224 alloy and its comparative performance to selected alumina- and chromia-forming heat-resistant alloys in flowing air at 982 °C and 871 °C. The HR-224 alloy outperformed several chromia-forming alloys owing to its ability to form and maintain a continuous, slow-growing, and adherent alumina scale. In fact, results indicated that HR-224 alloy exhibits comparable oxidation resistance to one of the most oxidation resistant alumina-forming Ni–Cr–Al-based 214 ® alloy. Moreover, in this paper, growth kinetics of alumina scale in these two alumina-forming alloys is discussed in detail. Among chromia-formers, Ni–Cr based alloys with low Fe contents exhibited excellent oxidation resistance.