Effect of Thermal Cycling on Oxidation of Nickel Based Superalloys in Presence of Aggressive Ions | ||||
| Arab Journal of Nuclear Sciences and Applications | ||||
| Article 16, Volume 53, Issue 4, October 2020, Page 147-154 PDF (772.36 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajnsa.2020.19768.1306 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Gaber Elawadi1; Salem Mohamed Abdel-Samad   2; Ezzat Elshazly3
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| 1Cyclotron Facility, Nuclear Research centre, Atomic Energy Authority | ||||
| 2Head of Experimental Nuclear Physics Dept. , Cyclotron Project, Nuclear Research Center, Atomic Energy Authority, Egypt | ||||
| 3Metallurgy Department, Nuclear Research Centre, Atomic Energy Authority. | ||||
| Abstract | ||||
| Superalloys are considered as potential candidates to be used in high temperature applications. In the present study, experimental measurements of high temperature oxidation in presence of aggressive ions of Nickel base superalloy (Hastelloy-X) have been carried out at 700°C, 800°C and 900°C for exposure time durations of 1, 3, 5, 10, 20, 50 and 100 hours. The oxidation behavior of superalloy Hastelloy X in the presence of aggressive media, normally, NaCl and Na2SO4 is to identify the surface scales that formed. After oxidation experiments the samples were characterized using Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) to find out the formed phases. The results showed that the major corrosion products formed are Nickel Chromites NiCr2O4 with some Chromium Cobalt Oxide CoCr2O4 spinels in additions to chromium oxide Cr2O3. The obtained results of Hastelloy X were compared with the results achieved previously for Inconel 617. In this study the activation energy of Hastelloy X was estimated and it is Ea = 57.84 KJ/mole. | ||||
| Keywords | ||||
| Oxidation; Hot corrosion; Hastelloy X; Inconel 617; SEM; XRD. RD | ||||
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