High temperature corrosion of the nickel-based alloy Inconel 617 in helium containing small amounts of impurities

Journal article
(Original article)


Publication Details

Author(s): Christ HJ, Künecke U, Meyer K, Sockel HG
Journal: Materials Science and Engineering
Publication year: 1987
Volume: 87
Pages range: 161-168
ISSN: 0025-5416
Language: English


Abstract

Application of the technical nickel-based alloy Inconel 617 as a
material for gas tubes in the primary circuit of the high temperature
gas-cooled reactor is limited essentially by the chemical reactions of
the alloying elements with the impurities (CO, CO2, H2, CH4 and H2O)
in the helium coolant. Depending on the temperature and gas
composition, carburization or decarburization as well as oxidation
occur. In this work the interaction of the alloy with the reactive
impurities in different simulated cooling gases were investigated by
thermogravimetry in a gas-tight microbalance and by simultaneous
measurements of the changes in the gas composition by a continuous
sensitive mass spectrometry analysis of the gas. The results demonstrate
that the occurrence of the various reactions is determined essentially
by temperature. For a standardized helium gas (HHT-He), three
temperature regions can be distinguished between. Below a critical
temperature (about 1105 K) the presence of CO can cause simultaneous
oxidation and carburization. Above about 1105 K, this reaction does not
reverse itself. Rather, oxidation by CO2 and H2O
takes place which shows, after a transient state, the same kinetics as
those observed in undiluted oxygen-containing gases. At temperatures
above about 1205 K, decarburization of the alloy accompanied by the
production of CO takes place, leading to severe destruction of the
carbide microstructure and therefore limiting the applicability of the
material.


FAU Authors / FAU Editors

Künecke, Ulrike Dr.-Ing.
Professur für Werkstoffwissenschaften (Werkstoffe der Elektrotechnik)


How to cite

APA:
Christ, H.-J., Künecke, U., Meyer, K., & Sockel, H.-G. (1987). High temperature corrosion of the nickel-based alloy Inconel 617 in helium containing small amounts of impurities. Materials Science and Engineering, 87, 161-168. https://dx.doi.org/10.1016/0025-5416(87)90374-0

MLA:
Christ, Hans-Jürgen, et al. "High temperature corrosion of the nickel-based alloy Inconel 617 in helium containing small amounts of impurities." Materials Science and Engineering 87 (1987): 161-168.

BibTeX: 

Last updated on 2019-27-02 at 13:50