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Meeting Materials Science & Technology 2020
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Elucidating Influence of Alloy Composition, Thermal Cycling and Environment on Oxidation Behavior of Engine Exhaust Valve Materials
Author(s) Rishi Pillai, Marie Romedenne, Allen Haynes, Bruce Pint
On-Site Speaker (Planned) Rishi Pillai
Abstract Scope Higher temperatures (T>800 C) are required in heavy duty engines to increase efficiencies. Oxidation induced chemical failure is a key life limiting mechanism at these temperatures. Consequently, various chromia-forming Ni-base alloys (Rene41, H282, Nim80A, Pyromet31V, IN751), combining excellent oxidation resistance and creep strength are being considered as engine exhaust valve materials. In the current work, oxidation behavior of model and commercial NiCr alloys was investigated in dry and wet air under thermal cycling conditions between 800-950C. Coupled thermodynamic-kinetic modeling was performed to understand the role of alloying elements and predict microstructural evolution. Different growth mechanisms of chromia scales in wet and dry air were observed. Presence of Mn and Si seemed to slightly improve oxidation resistance of the alloys while alloys with higher Ti contents performed poorly, especially at T>850 C. This research was sponsored by the Department of Energy, Vehicle Technologies Office, Propulsion Materials Program.


Corrosion Study of Stainless Steel 316 with Different Coatings in MgCl2-KCl Heat Transfer Fluid
Effect of Al Addition on Oxidation Behavior of a New Mo-Si-B Alloy
Elucidating Influence of Alloy Composition, Thermal Cycling and Environment on Oxidation Behavior of Engine Exhaust Valve Materials
Environmental Resistance and Microstructure Design in Mo-Si-B Alloys
Exploring Materials Options for sCO2 Applications: Steels to Cermets
Influence of the Water Vapor on Oxide Scale and Alpha Case Layer in Ti6Al4V
Introductory Comments: High-temperature Corrosion and Degradation of Structural Materials
Kinetic Modeling of High-temperature Oxidation of Pure Metals by Incorporating Wagner’s Theory into the CALPHAD Approach
Long-term Oxidation Behavior of Chromia-forming Alloys in High-temperature CO2 and Air
Machine Learning and Data Analytics for Accelerating High-temperature, Corrosion-resistant Materials Design
Metal Dusting of Ni-based Alloys at Elevated Pressure in Different Gas Compositions
The Effect of Surface Treatment on the Formation, Structure, and Chemistry of Protective Oxide Scale on High-temperature Oxidation-resistant Nickel Alloys
Thermochemical Stability of EBC Silicates in High-temperature High-velocity Water Vapor

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