Oxidation characteristics of the electron beam surface-treated Alloy 617 in high temperature helium environments

Cited 6 time in webofscience Cited 0 time in scopus
  • Hit : 148
  • Download : 0
The oxidation characteristics of the electron beam surface-treated Alloy 617, which has an Al-rich surface layer, were evaluated in high temperature helium environments. Isothermal oxidation tests were performed in helium (99.999% purity) and VHTR-helium (helium of prototypical VHTR chemistry containing impurities like CO, CO2, CH4, and H-2) environments at 900 degrees C for up to 1000 h. The surface-treated Alloy 617 showed an initial transient oxidation stage followed by the steady-state oxidation in all test environments. In addition, the steady-state oxidation kinetics of the surface-treated Alloy 617 was 2-order of magnitude lower than that of the as-received Alloy 617 in both helium environments as well as in air. The improvement in oxidation resistance was primarily due to the formation of the protective Al2O3 layer on the surface. The weight gain was larger in the order of air, helium, and VHTR-helium, while the parabolic rate constants (k(p)) at steady-state were similar for all test environments. In both helium environments, the oxide structure consisted of the outer transition Al2O3 with a small amount of Cr2O3 and inner columnar structured Al2O3 without an internal oxide. In the VHTR-helium environment, where the impurities were added to helium, the initial transient oxidation increased but the steady state kinetics was not affected.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

NICKEL-BASE ALLOY; NI-CR-AL; TRANSIENT OXIDATION; CORROSION; BEHAVIOR; MICROSTRUCTURE; INCONEL-617; GROWTH; CRACKS; LAYER

Citation

JOURNAL OF NUCLEAR MATERIALS, v.456, pp.220 - 227

ISSN
0022-3115
DOI
10.1016/j.jnucmat.2014.09.043
URI
http://hdl.handle.net/10203/195180
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 6 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0