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Article
Open AccessDifferences in Oxidation Behavior of Conventionally Cast and Additively Manufactured Co-Base Alloy MAR-M-509
High-temperature oxidation behavior of conventionally cast and additively manufactured (AM) Co-base alloy MAR-M-509 was compared in the present study. The specimens were exposed in air at 1000 °C and character...
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Article
Open AccessEffect of Surface Oxide on Decarburization Reaction in the Austenitic Steel S304HCu
In the present work, the high-temperature decarburization of the austenitic stainless steel S304HCu in Ar–4%H2–xH2O at temperatures between 1000 and 1150 °C was investigated. The focus was on determining paramete...
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Article
Modeling in High Temperature Corrosion: A Review and Outlook
Realizing higher operating temperatures to increase efficiency of future applications for energy conversion and storage while minimizing cost is a challenge for development of high-temperature materials. Simul...
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Article
Effect of Nb Addition on Oxidation Mechanisms of High Cr Ferritic Steel in Ar–H2–H2O
High chromium ferritic steels are being used as construction materials for interconnects in solid oxide electrolysis cells (SOEC). Addition of niobium in the range of a few tenths of a percent is suitable for ...
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Article
Behaviour of Metallic Materials in Simulated Service Environments of CO2/H2O Co-electrolysis Systems for Power-to-X Application
In the present study, the ferritic steel Crofer 22 H as potentially suitable interconnect material for SOEC stacks as well as joints between the steel and Ni- and CuNi contact materials was investigated with r...
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Article
Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating
The effect of two base alloys, viz. Ni-based superalloy Rene 80 and Co-based alloy ECY768, on the oxidation and interdiffusion behavior of a NiCoCrAlY Re-containing coating after exposure for up to 2000 h at 1...
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Article
Corrosion Behavior of Austenitic Stainless Steels in Oxidizing and Reducing Gases Relevant to Oxyfuel Power Plants
The oxidation behavior of three austenitic stainless steels was studied at 650°C up to 1000 h. The selected materials (S304HCu, TP347HFG, and Sanicro 25) were exposed to an atmosphere simulating oxyfuel combus...
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Article
Stability of External α-Al2O3 Scales on Alloy 602 CA at 1100–1200 °C
An external ultrathin α-Al2O3 scale grown on the Ni-base alloy 602 CA during air oxidation at 800 °C was characterized by means of high-resolution TEM/EDX and electron diffraction. Alloy samples pre-oxidized at 8...
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Article
Phase Transformations in Co-Ni-Cr-W Alloys During High Temperature Exposure to Steam Environment
Three model alloys, Co-10Ni-20Cr-15W, Co-30Ni-20Cr-15W and Ni-20Cr-15W (all in wt.%) were investigated in Ar-50%H2O at 700 and 750 °C for up to 3000 h reaction. The results showed the formation of thin chromia sc...
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Article
Effect of Sulphur on the Oxidation Behaviour of Possible Construction Materials for Heat Exchangers in Oxyfuel Plants in the Temperature Range 550–700 °C
During oxyfuel combustion metallic heat exchangers are subjected to service environments which substantially differ from those prevailing during the conventional air firing process. In the present study the be...
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Article
Influence of Alloying Elements on the Behavior of Different Ferritic Steels as Candidate Materials for SOFC Interconnect
The efficiency of a solid oxide fuel cell (SOFC) can be improved by using a Ni-mesh between the ferritic steel interconnect and the Ni/YSZ anode. However, interdiffusion processes can lead to internal oxidatio...
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Article
Overview on Recent Developments of Bondcoats for Plasma-Sprayed Thermal Barrier Coatings
The performance of MCrAlY (M = Ni, Co) bondcoats for atmospheric plasma-sprayed thermal barrier coatings (APS-TBCs) is substantially affected by the contents of Co, Ni, Cr, and Al as well as minor additions of...
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Article
Future Directions in the Field of High-Temperature Corrosion Research
High-temperature corrosion research will face a significant change in the near future. Up until now, this research area was dominated by materials issues related to the use of fossil fuels in energy conversion...
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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
Effect of SO2 Addition on Air Oxidation Behavior of CM247 and CMSX-4 at 1050°C
In the present work, the oxidation behavior of two commercial Ni-base superalloys, CMSX-4 and CM247, in synthetic air with and without 2 vol.% SO2 at 1050°C has been studied. The corrosion reactions in the presen...
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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
Modeling Interdiffusion Processes in CMSX-10/Ni Diffusion Couple
A diffusion couple between directionally solidified nickel and the single crystal Ni-base superalloy CMSX-10 was produced by hot pressing in vacuum. The diffusion couples were heat treated at temperatures bet...
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Article
Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C
An accurate procedure for predicting oxidation-induced damage and lifetime limits is crucial for the reliable operation of high-temperature metallic components in practical applications. In order to develop a ...
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Article
Temperature Dependence of Laves Phase Composition in Nb, W and Si-Alloyed High Chromium Ferritic Steels for SOFC Interconnect Applications
The Laves phase strengthened ferritic steel Crofer 22 H has been proposed as construction material for interconnects in solid oxide fuel cells. The background of the present study relates to the further qualif...
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Article
Boron Depletion in a Nickel Base Superalloy Induced by High Temperature Oxidation
The conventionally cast Ni-base superalloy Rene 80 containing 90 wt ppm boron was oxidized in synthetic air at 850–1,050 °C for times up to 100 h. Extensive microstructural studies using GD-OES and SEM/WDX/EBS...
