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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Phase Stability in Extreme Environments II
Presentation Title Development of Novel Intermetallic Dispersion Strengthened Steels
Author(s) Iris Carneiro, Alexander J. Knowles
On-Site Speaker (Planned) Iris Carneiro
Abstract Scope With the need to increase the efficiency of high-demanding industries, such as aerospace and nuclear, including supercritical -H2O and -CO2 turbine cycles, there is a desire to develop materials that operate at higher temperatures in ever more extreme environments. To meet these challenges, ferritic superalloys are strengthened through intermetallic precipitation towards operation at 600-800C. Besides the high hardness and strengthening of these particles by inhibiting dislocation movement, even under high temperatures, they can also prevent grain growth by pinning grain boundaries. The goal was to design and optimize composition and thermomechanical conditions to obtain novel ferritic superalloys reinforced by intermetallics. Alloy design and phase prediction were carried out on CALPHAD, produced by arc-melting, followed by a combination of thermomechanical deformation and heat treatments. Characterisation was performed using EBSD, EDX and XRD techniques. Intermetallics, as Heusler (L21) and the recently reported π-ferrosilicide were observed in the microstructure, successfully reinforcing these alloys.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Nuclear Materials, Iron and Steel

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced Manufacturing and Sensor Integration for Smart Sensing on Nuclear Packages
Atomic-scale Understanding of the Hydrogen Embrittlement Mechanism in Model and Commercial Austenitic Steels Using Cryogenic Transfer Atom Probe Tomography
Behavior of Tritium Breeder Ceramics under Ion Irradiation
Degradation Mechanisms of Steels and Ni-based Alloys in Hydrogen/Water Vapor High Temperature Environments
Development of Novel Intermetallic Dispersion Strengthened Steels
Effect of Damage, Temperature, and Helium on Irradiated Nanoprecipitation in Advanced Ferritic/Martensitic (F/M) Fe9Cr Steel
Effect of Hydrogen on the Phase Stability of Steels
Effect of Surface Orientation on the Oxidation of Ni-based Single-crystal Superalloys Using Ab Initio Simulations
Effects of Microstructural Variance on Edge Dislocation Mobility and Pinning in Nickel Superalloys at High Temperatures
Exceptional Fatigue Strength of a Microstructurally Stable Bulk Nanocrystalline Alloy
Exploring and Quantifying Degradation Mechanisms in Irradiated Structural Materials
Frictional Ignition of Dispersion-strengthened Ni-base Superalloys in High Pressure Oxygen Environments
Impact of Build/Print Variations on Steam Oxidation Performance of 316L Stainless Steel
Improving Radiation Resistance in Metal Alloys via the Use of Multiple Synergistic Solutes
Investigating the Coupling between Short-range Order and Radiation Damage in Multi-component Alloys
Metastability-driven design of AM Al-based Superalloys
Microstructural Evolution and Hardness Changes in Ion Irradiated Ni-based Superalloys
Microstructure Evolution in Cr0.5FeNiMn and CrFeNiCoPd0.75 Alloys under Ion Irradiation
Non-ideality of Hydrogen Isotope Permeation in Metals & Alloys
Phase-field-informed Crystal-plasticity Modeling of 3D γ’ Rafting in Ni-based Single-crystal Superalloys
Precipitate Evolution and Stability in Superalloy 718 Following HFIR Irradiation or Thermal Aging
Radiation-induced Partial Disordering of Heusler Phase in Intermetallic Dispersion Strengthened Ferritic Superalloys
Stability of Hydrogen/Helium-filled Nanocavities in Structural Alloys after Low Temperature Irradiation with Simultaneous High Energy Protons and Spallation Neutron
Stability of Nanoporous Ultra-High Temperature Ceramics at High Temperatures
Superior Radiation Resistance and Structural Stability in Nanotwinned High Entropy Thin Film under Extreme Radiation Damage
The Effect of Alloying Elements and Atmosphere on the Oxidation of NiCr Model Alloys
The Less Understood Impact of Environmental Degradation on Phase Stabilities in High Temperature Alloys

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