|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||151 Characterization of the Oxidation Behavior of Nb-20Si-20Cr Alloy
||Daniel Brendan Voglewede, Shailendra K Varma
|On-Site Speaker (Planned)
||Daniel Brendan Voglewede
Nb-20Si-20Cr alloy has been subjected to static oxidation for 24 hours (short term oxidation, STO) and then subjected to 7 cycles of 24 hours (long term oxidation, LTO) in a range of temperature from 700 to 1400°C. Internal oxidation appears to be controlling the oxidation at 900°C while pesting is the oxidation mechanism at 1100°C. Spalling begins to take place at 1200°C and continues until 1400°C. The alloy survives the oxidation in air up to 1400°C. The results will be compared with the published work on Nb-20Si-20Cr-5Al to determine the effect of Al on the oxidation behavior. Oxide scale and microstructures in the as-cast and after oxidation have been characterized using SEM, EDS, x-ray mapping and XRD.