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51317-9006-OXIDATION AND CARBURIZATION OF ALLOYS EXPOSED TO IMPURE SUPERCRITICAL CO2

A laboratory study was performed by exposing seven candidate heat exchanger alloys to simulated 2 (sCO2) Brayton power cycles. The alloys, consisting of fineirtriaitilcly s 3te.6e%ls ,O austenitic stainless steels, and nickel-base alloys, were exposed to impure CO2 containing 2 and 5.3% H2O at a constant pressure of 200 bar.

Product Number: 51317-9006-SG
Author: S. C. Kung / I. G. Wright
Publication Date: 2017
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 A laboratory study was performed by exposing seven candidate heat exchanger alloys to simulated 2 (sCO2) Brayton power cycles. The alloys, consisting of fineirtriaitilcly s 3te.6e%ls ,O austenitic stainless steels, and nickel-base alloys, were exposed to impure CO2 containing 2 and 5.3% H2O at a constant pressure of 200 bar. The test temperatures varied from 650° to 750°C. The total exposure time of each test was 1000 hours, with the alloy coupons removed from the retort after approximately 300,600 and 1000 hours.  Metalurgical analyses were performed on the exposed samples using optical microscopy, SEM/EDS, and a micro-hardness tester to characterize the scale morphologies and the extent of carburization in the alloys.

 

 

 

Key words: conference papers, 2017 conference papers, Supercritical, CO2, Corrosion, Oxidation, Carburization, Ferritic Steel, Austenitic Stainless Steel, Nickel-Base Alloys

 

 

 

 

 A laboratory study was performed by exposing seven candidate heat exchanger alloys to simulated 2 (sCO2) Brayton power cycles. The alloys, consisting of fineirtriaitilcly s 3te.6e%ls ,O austenitic stainless steels, and nickel-base alloys, were exposed to impure CO2 containing 2 and 5.3% H2O at a constant pressure of 200 bar. The test temperatures varied from 650° to 750°C. The total exposure time of each test was 1000 hours, with the alloy coupons removed from the retort after approximately 300,600 and 1000 hours.  Metalurgical analyses were performed on the exposed samples using optical microscopy, SEM/EDS, and a micro-hardness tester to characterize the scale morphologies and the extent of carburization in the alloys.

 

 

 

Key words: conference papers, 2017 conference papers, Supercritical, CO2, Corrosion, Oxidation, Carburization, Ferritic Steel, Austenitic Stainless Steel, Nickel-Base Alloys