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Article
Establishing a Design Strategy for Corrosion Resistant Structural Materials in Molten Salt Technologies
To address the gap in material design strategies for structural components in molten salt-powered technologies, the current work aimed to identify key parameters governing corrosion induced degradation of mate...
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Chapter and Conference Paper
Compatibility of Wrought Superalloys with Supercritical CO2
Supercritical CO2 (sCO2) power cycles, particularly direct-fired cycles, have the possibility of revolutionizing clean fossil energy with peak temperatures above 700 °C and wrought strengthened alloys like Hayn...
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Article
Exploring Material Solutions for Supercritical CO2 Applications above 800 °C
There has been recent interest in exploring revolutionary supercritical CO2 (sCO2) power cycles, and this exploratory investigation was seeking materials with CO2 compatibility at up to 1200 °C. Initial exposures...
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Article
The Effect of APS-HVOF Bond Coating Thickness Ratio on TBC Furnace Cycle Lifetime
Combinations of NiCoCrAlY APS and high-velocity oxygen fuel (HVOF) bond coatings were deposited on alloy 247 disk substrates with APS yttria-stabilized zirconia (YSZ) top coatings to assess the benefit of air ...
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Article
Lessons Learned in Employing Data Analytics to Predict Oxidation Kinetics and Spallation Behavior of High-Temperature NiCr-Based Alloys
Machine learning (ML) can offer many advantages in predicting material properties over traditional materials development methods based solely on limited experimental investigations or physical-based simulation...
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Article
Effect of Water Vapor on Lifetime of 625 and 120 Foils During Oxidation Between 650 and 800 °C
The oxidation behavior of alloy 625 and 120 foils was studied at 650, 700 and 800 \(^\circ\) ...
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Article
The Role of Oxidation Resistance in High Temperature Alloy Selection for a Future with Green Hydrogen
Hydrogen is being considered integral to the future energy landscape but there is limited mechanistic understanding and a lack of predictive models to describe the combined effects of alloy and gas composition...
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Article
Oxidation Behavior of Candidate NiCr Alloys for Engine Exhaust Valves: Part I—Effect of Minor Alloying Elements
Oxidation-induced degradation of structural materials employed as exhaust valves within internal combustion engines (ICEs) will be a relevant life-limiting mechanism, in addition to creep and mechanical fatigu...
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Article
Effect of Pressure and Thermal Cycling on Long-Term Oxidation in CO2 and Supercritical CO2
Concentrating solar power plant designers are interested in supercritical CO2 (sCO2) for the power block to achieve > 50% electrical efficiency at > 700 °C. The goal of this project was to develop a long-term (> ...
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Chapter and Conference Paper
Computational Methods to Accelerate Development of Corrosion Resistant Coatings for Industrial Gas Turbines
Oxidation resistant protect the underlying superalloy component in industrial from oxidation attack. Rate of depletion of the Al-rich β-phase in the bond coat governs the lifetime of these coatings. The appli...
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Article
The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance
To study the benefit of ~ 50-µm-thick air-plasma-sprayed (APS) ‘flash’ bond coatings, NiCoCrAlYHfSi high-velocity oxygen fuel (HVOF) bond coatings were deposited on alloy 247 disk substrates with APS yttria-st...
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Chapter and Conference Paper
Steam Oxidation Behavior of FeCrAl Cladding
In order to better understand the high temperature steam oxidation behavior FeCrAl alloys, this study addressed two topics. The first is continuing to evaluate the effect of alloy composition on performance ...
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Article
The Effect of CO2 Pressure on Chromia Scale Microstructure at 750°C
To understand and model performance in supercritical CO2 (sCO2) for high-efficiency, concentrating solar power (CSP) and fossil energy power cycles, reaction rates are compared at 750°C in 0.1 MPa CO2 and 30 MPa ...
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Chapter and Conference Paper
Performance of Wrought Superalloys in Extreme Environments
As power generation systems move towards higher efficiency operation above 700 ℃, wrought superalloys are the leading structural alloy candidates, including strengthened (PS) alloys 740 and 282 for the highe...
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Article
Steam Oxidation Evaluation of Fe–Cr Alloys for Accident Tolerant Nuclear Fuel Cladding
New nuclear fuel cladding materials are being evaluated that can withstand steam environments ≥1200 °C for short (≤4 h) periods in case of a beyond design basis accident. This study focused on commercial and m...
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Article
Development of 1100 °C Capable Alumina-Forming Austenitic Alloys
Recently developed alumina-forming austenitic (AFA) alloys based on ~12–32 weight % (wt%) Ni offer an attractive combination of oxidation resistance and creep resistance at relatively low alloy cost. However, ...
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Article
Predicting Oxidation-Limited Lifetime of Thin-Walled Components of NiCrW Alloy 230
Using alloy 230 as an example, a generalized oxidation lifetime model for chromia-forming Ni-base wrought alloys is proposed, which captures the most important damaging oxidation effects relevant for component...
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Article
Influences of Superalloy Composition and Pt Content on the Oxidation Behavior of Gamma–Gamma Prime NiPtAl Bond Coatings
The effects of superalloy composition and Pt content on the high-temperature oxidation behavior of γ–γ’ NiPtAl diffusion coatings were investigated over the temperature range of 1050–1150 °C. Simple NiPtAl dif...
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Article
Current Thoughts on Reactive Element Effects in Alumina-Forming Systems: In Memory of John Stringer
In memory of John Stringer (1934–2014), one of the leaders in studying the reactive element (RE) effects, this paper reviews the current status of understanding of the effect of RE dopants on high-temperature ...
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Article
Initial Assessment of Ni-Base Alloy Performance in 0.1 MPa and Supercritical CO2
There is considerable interest in increasing the working temperature of both open and closed supercritical CO2 (sCO2) cycles to ≥700°C. At these temperatures, it is unlikely that Fe-base alloys have suitable stre...
