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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Phase Stability in Extreme Environments II
Presentation Title Effect of Hydrogen on the Phase Stability of Steels
Author(s) Tilmann Hickel, Ali Tehranchi, Joerg Neugebauer
On-Site Speaker (Planned) Tilmann Hickel
Abstract Scope In this work, we studied the role of extreme hydrogen concentrations on the relative stability of the fcc/bcc/hcp phases using the ab initio thermodynamics. The results indicate that at low hydrogen chemical potentials the stability of the fcc phase, which can be representative of retained austenite (RA) in steels, is slightly enhanced by the presence of H atoms. In contrast, at high hydrogen chemical potentials the bcc phase is stabilized by H. Moreover, since the excess volume of the hydrogen-rich bcc phase is significantly larger than that of the fcc phase, the presence of a stress field can change the relative stability of these phases in the coexistence regions of the phase diagram. This feature is particularly important for cyclic loading conditions: during loading cycles forward and reverse phase transformations occur and the H released by these transformations can damage the material.
Proceedings Inclusion? Planned:
Keywords Environmental Effects, Iron and Steel, Phase Transformations


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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