TITLE:
High Temperature Cyclic Oxidation Behavior of Ni and Co Based Superalloys
AUTHORS:
Deepa Mudgal, Surendra Singh, Satya Prakash
KEYWORDS:
Cyclic oxidation, SEM, EDAX
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.11 No.3,
March
20,
2012
ABSTRACT: High temperature oxidation causes degradation of materials in aircraft, marine, industrial and
land base gas turbines. To obviate this problem, oxidation behavior of Ni and Co based
superalloys viz superni 600 and superco 605 (Midhani grade) has been studied in air at 900oC.
Both superalloys go through cyclic oxidation which consists of 1 hr heating in silicon carbide
tube furnace followed by 20 min cooling in ambient air. Weight change was taken by a digital
electronic weighing balance having accuracy of 1 mg after each cycle. Exposed alloys were
characterized by XRD, FESEM and EDS. Result shows that the Co base superalloy superco 605
shows less weight gain as compare to superni 600. The oxide layer mainly contains oxides of
Cr2O3, NiO and spinel NiCr2O4.