Christ HJ, Künecke U, Meyer K, Sockel HG (1987)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 1987
Book Volume: 87
Pages Range: 161-168
DOI: 10.1016/0025-5416(87)90374-0
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.
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: Download