Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina-forming alloy. Part II: Cyclic oxidation tests

✍ Scribed by S. Chevalier; A. P. Dawah Tankeu; H. Buscail; C. Issartel; G. Borchardt; J. P. Larpin

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: German
• Weight: 569 KB
• Volume: 55
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.200303773

✦ Synopsis

Abstract

Several routes of yttrium introduction were applied to test the high temperature oxidation performance of a FeCrAl alloy. Isothermal oxidation tests were described in a previous paper (Part I of this paper in this journal, 2004, 55, 352). Cyclic oxidation tests were performed in air under atmospheric pressure on blank specimens, Y~2~O~3~ sol‐gel coated‐, Y~2~O~3~ metal‐organic chemical vapor deposited (MOCVD)‐, yttrium ion implanted‐alloys, as well as on a steel containing 0.1 wt. % of yttrium as an alloying element. For the 20 hours cycles, all the samples, except FeCrAl‐0.1Y, exhibit weight losses after a few cycles, indicating drastic spallation of the oxide scales. The MOCVD coated specimen has the highest weight loss. The oxidation kinetics of the FeCrAl‐0.1Y alloy obey a parabolic law, indicating that the alumina scale formed on its surface is protective even after more than 1200 hours of oxidation (> 50 cycles). The 100 hours cycle oxidation tests give similar results. The FeCrAl‐0.1Y alloy exhibits the best oxidation behavior with very little spallation after more than 2000 hours (85 days) of oxidation at 1100°C (20 cycles). Most of the other samples exhibit severe oxide scale spallation followed by an increase of their oxidation rate related to the formation of non‐protective iron oxides.