The development of a high temperature supercritical carbon dioxide corrosion test rig

Petrusenko, Ryan

doi:10.22215/etd/2011-06883

Cited by 2 publications

(8 citation statements)

References 32 publications

(108 reference statements)

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“…A comparison of compositions is provided in Table 1. In contrast, wrought alloys usually exceed cast alloys in tensile strength and low fatigue strength due to a finer grain size [9]. A comparison of these superalloy c with respect to rupture strength in provided in Figure 7.…”

Section: High Temperature Materialsmentioning

confidence: 99%

“…This transport of ions determines the rate of oxide growth, consisting of metal depletion, and is the determining factor for the effectiveness of the oxide to protect the substrate metal. As illustrated in Figure 10 The reaction for high temperature oxidation in producing the metal oxide product consists of the equation adapted from [9]:…”

Section: Formation Of Oxidesmentioning

confidence: 99%

“…As the surface of the metal is quickly covered, diffusion of ions becomes the underlying mechanism for oxide growth. The rate-determining characteristics of the oxide determine the ability of new oxidizing reactions to occur, where a protective oxide would eventually prevent further oxidization [9].…”

Section: Ag = Ah-tas (5)mentioning

confidence: 99%

“…An alloy exhibiting this relationship is able to a stable oxide that isn't prone to cracking, porosity, and is well adhered to the to prevent further metal exposure. Due to a higher rate of oxide growth, alloys wi parabolic rates typically have oxides with higher diffusion coefficients and/or mo defects for ion transport [7,9].…”

Section: Ag = Ah-tas (5)mentioning

confidence: 99%

“…The furnace controller is programmed to increase temperature at a rate of 200°C/hr to set the target temperature. Based on commissioning results discussed in detail in [9], the furnace set points for various target temperature are listed in Table 8.…”

Section: Rig Operationmentioning

confidence: 99%

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Corrosion of candidate high temperature alloys in supercritical carbon dioxide

Parks¹

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The corrosion resistance of three candidate alloys is tested in supercritical carb dioxide (S-C0 2 ) at different levels of temperature and pressure for up to 3000 houThe purpose of the testing is to evaluate the compatibility of different engineeri alloys in S-C0 2 for use in a S-C0 2 Brayton cycle. The three alloys used are austeni stainless steel 316, iron-nickel-base superalloy 718, and nickel-base superalloy 7Each alloy is exposed to four combinations of temperature and pressure, consisting of either 550°C or 700°C at either 15 or 25 MPa for up to 1500 hours. At each temperature, an additional sample set is tested for 3000 hours and experienced an increase in pressure from 15 MPa to 25 MPa after 1500 hours of testing. All three alloys are successful in producing a protective oxide layer at the lower temperature of 550°C based on the logarithmic weight gain trends. At the higher temperature of 700°C, 316SS exhibits unfavourable linear weight gain trends at bot pressures of 15 and 25 MPa. In comparison, IN-718 and IN-738 performs similarly in producing a protective oxide layer illustrated through a power weight gain relatio The effect of pressure is most pronounced at the operating temperature of 700° C, where the higher pressure of 25 MPa results in an increased rate of oxide formatio SEM analysis exposes a thin film oxide for both IN-718 and IN-738 but severe intergranular corrosion is exhibited by IN-738. Based on the testing conducted, bo alloys show favourable characteristics for use in S-C0 2 conditions up to 700°C, bu further testing is required to characterize the effect of the intergranular corros ii the stability of oxide in IN-738. 316SS provided favourable results for use in temperatures of 550°C, but the protective oxide deteriorated at an operating temperature of 700°C. m

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Section: High Temperature Materialsmentioning

confidence: 99%

Section: Formation Of Oxidesmentioning

confidence: 99%

Section: Ag = Ah-tas (5)mentioning

confidence: 99%

Section: Ag = Ah-tas (5)mentioning

confidence: 99%

Section: Rig Operationmentioning

confidence: 99%

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Corrosion of candidate high temperature alloys in supercritical carbon dioxide

Parks¹

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Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

Ilinich

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This work presents the first oxidation studies of Co-Cr-Fe-Ni-based high entropy alloys (HEAs) in supercritical-CO2 (sCO2) environment. These materials are being evaluated as an alternative to commercial Ni-based superalloys for construction of select components of sCO2 power cycles. The alloys investigated in this research include CoCrFeMnNi, Al0.5CoCrFeMnNi1.5, Al0.5CoCrFeNi1.5, (CoCrFeMnNi)Si0.01, and CoCrFe0.5MnNi1.5 specifically designed to study the impact of Mn, Al, Si and Fe on the oxidation behaviour. The HEAs were characterized through scanning electron microscopy (SEM), energy-dispersive Xray spectroscopy (EDS), X-ray diffraction before and after exposure to sCO2. The samples were tested inside a high pressure sCO2 corrosion test rig located at Natural Resources Canada's, capable of mimicking the operating conditions of indirectly-fired sCO2 power cycles. The oxidation behaviour was evaluated by comparing experimentally obtained mass gain data and the characterized oxide formations. The pre-exposure results show that Al0.5CoCrFeMnNi1.5 and Al0.5CoCrFeNi1.5 compositions form γ/γ' microstructure, desirable for high strength applications, while the exposure to sCO2 at elevated temperatures (500-700°C) and pressure (20 MPa) causes formation of ordered B2 NiAl phases dispersed within the matrix. Al0.5CoCrFeNi1.5 is the only composition that forms detectable protective Cr2O3 after 300 hours at 500°C/20MPa, as well as after 600 hours at 700°C/MPa. The other four compositions were shown to form a porous unprotective MnO oxide layer. Additionally, the results indicate that similar to conventional alloy systems, the oxidation of HEAs increases with temperature, however, Al0.5CoCrFeNi1.5 exhibited nearly the same mass gain at both temperatures after 300 and 600 hours. Lastly, the results suggest that Al0.5CoCrFeNi1.5 composition has the potential to outperform commercial superalloys in sCO2 applications.

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The development of a high temperature supercritical carbon dioxide corrosion test rig

Cited by 2 publications

References 32 publications

Corrosion of candidate high temperature alloys in supercritical carbon dioxide

Corrosion of candidate high temperature alloys in supercritical carbon dioxide

Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

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