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Meeting MS&T21: Materials Science & Technology
Symposium Nucleation of Solid-State Phase Transformations
Presentation Title Formation of the γ’’’-Ni2(Cr, Mo, W) Phase during Two-step Heat Treatment in Haynes® 244® Alloy
Author(s) Thomas Mann, Michael Fahrmann, Michael Titus
On-Site Speaker (Planned) Thomas Mann
Abstract Scope Several nickel alloys containing molybdenum and chromium have shown short range order (SRO) from cooling after a solution anneal heat treatment. This short range order includes DO22, DOa, and Pt2Mo type phases that can evolve into long range order (LRO) domains that increase the strength of the alloy. Haynes® 244® has shown this short range order to long range order transition resulting in the γ’’’-Ni2(Cr, Mo, W) phase, which significantly strengthens the alloy. Previous studies have shown the transformation to be a precipitation transformation at higher aging temperatures and a continuous ordering transformation at lower aging temperatures. This study investigates the use of a two-step aging treatment to rapidly age the alloy resulting in LRO of the γ’’’-Ni2(Cr, Mo, W) phase. The formation behavior and SRO to LRO transition were investigated using small-angle x-ray scattering and electron microscopy. Optimizing the aging heat treatment schedules and strength will be presented.


3-dimensional Observation of Bainite from Austenite Grain Boundary in 0.6wt% Carbon Steel.
Critical Nuclei at Hetero-phase Interfaces
Effect of Cooling Rate and Austenitic Grain Size on the Austenite Decomposition Kinetics in a Low- carbon Steel
Formation of the γ’’’-Ni2(Cr, Mo, W) Phase during Two-step Heat Treatment in Haynes® 244® Alloy
Identification of Critical Nucleation Events by the Gromov-Wasserstein Distance
Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Modeling Microstructure Evolution Using the Steepest-entropy-ascent Quantum Thermodynamic Framework
Observing the Solid-state Processes under Additive Manufacturing Conditions Inside the TEM
P1-28: Structure Influenced Rapid Hydrogenation Using Metal-acid Contacts on Crystallographically Oriented VO2 Thin Films

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