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Meeting MS&T22: Materials Science & Technology
Symposium Alloy Phase Transformations at Elevated Temperatures
Presentation Title Microstructure Evolution and Mechanical Properties of α′/α″-Strengthened Ferritic Superalloys
Author(s) Christopher H. Zenk, Luis Morales, Andreas Bezold, Andreas Förner, Steffen Neumeier, Carolin Körner
On-Site Speaker (Planned) Christopher H. Zenk
Abstract Scope Ferritic superalloys are an emerging class of materials based on the Fe-Al-Ni system. A coherent bcc-derived α/α′ (A2/B2) microstructure can be established, analogous to the γ/γ′ (A1/L12) microstructure of Ni-base superalloys. With Fe as their base element (∼50at.%) and a high Al-content (∼18at.%) these materials have a major cost advantage over Ni-base superalloys. The addition of Ti facilitates the partial transformation of α′ into L21 (based on Ni2AlTi, henceforth α″) and significantly improves the creep resistance of these alloys. Our alloy development efforts led to an α′/α″-strengthened alloy that was additively manufactured via Laser Metal Deposition. In-situ synchrotron diffraction reveals insights into the complex phase transformation pathway through which a variety of different microstructures can be designed. The elemental partitioning between the three phases is measured in TEM and APT. The high-temperature mechanical properties will be discussed on the basis of compressive and tensile tests as well as creep tests.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing Design of Metal Matrix Composites of Stainless Steel 316 and Inconel 718
Alternate Phase Transformation Paths in a Nb-50Ti Alloy in the Presence of Oxygen Interstitials
Develop Precipitation-Strengthened Refractory High Entropy Alloys for Turbine Blades Applications above 1300 Degree Celsius
E-1: Multiscale Modeling of Solidification Processes for Metal & Alloys
Effect of Grain Boundary Phases on Creep Properties of a Novel Ni-Co Based Superalloy
Examining the Influence of Nitride Precipitation on the Performance of Additively Manufactured Nickel Superalloys
Hyper Duplex Stainless Steel: A Study on the Sigma Phase Formation
Impact of Manufacturing Processes on Phase Transformations in High-temperature Alloys: Some Thoughts Based on Representative Case Studies
In-situ Neutron Characterization of Thermomagnetic Processes Utilizing Direct Induction Heating
Metallic Alloy Microstructure Prediction and Control with Processing
Microstructure and Mechanical Properties of W-free γ + γ' Co-based Superalloys with Ni, Cr, and Fe Additions
Microstructure Evolution and Mechanical Properties of α′/α″-Strengthened Ferritic Superalloys
On the Shapes of Time-Temperature-Transformation Curves across Alloys and Reactions
Phase Stability in Cast and Additively Manufactured Al-9 wt%Cu-6 wt%Ce Alloy
Precipitation Strengthening in BCC Al2.7CrMnTiV High-Entropy Alloys
Precursor Metastable Phases and Their Influence on α Precipitation in the Metastable β-titanium Alloy, Ti-5Al-5Mo-5V-3Cr
Single-step Aging Treatment on Cast Haynes 282 Ni-based Alloy – Microstructure and Mechanical Behavior
Solidification Modelling With CALPHAD: Process Applications of Equilibrium and Non-equilibrium Models and When to Use Them
Study of Thermal Decomposition of γ’-Fe4N Using Molecular Dynamics Simulation
The Optimization of Local Phase Transformation Strengthening in Next Generation Superalloys
Thermal Stability and Time-temperature-transformation Diagrams of Co-rich Nanocomposite Ribbons
Tracking Changes in Microstructure and Mechanical Properties of Electron Powder Bed Fusion Produced Inconel-738

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