The effect of reactive air aluminizing (RAA) on the high-temperature oxidation behavior of the H230 superalloy is studied at 850 °C for 600 hours. Mass gain values are measured and microstructure is studied by XRD, SEM, and EDX. Post oxidation mass gain for the aluminized alloy is reduced compared to wrought alloy. A three-zone microstructure of diffusion coating is observed in RAA H230. Formation and growth of alumina scale during RAA process and oxidation is attributed to the complementary roles of ß-NiAl + ?'-Ni3Al phases in the composite coating.
Revised: August 17, 2020 |
Published: September 1, 2020
Citation
Rashidi S., J. Choi, J.W. Stevenson, A. Pandey, and R.K. Gupta. 2020.High Temperature Oxidation Behavior of Aluminized Haynes 230.Corrosion Science 174.PNNL-SA-153949.doi:10.1016/j.corsci.2020.108835