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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
Presentation Title γ+γ′ Microstructures in W-free Co-Ta-V- and Co-Nb-V-based Systems
Author(s) Fernando Luis Reyes Tirado, David C. Dunand
On-Site Speaker (Planned) Fernando Luis Reyes Tirado
Abstract Scope The precipitation of the γ′-phase in Co-Ta-V and Co-Nb-V ternary alloys is investigated based on recent computational predictions of stable γ-γ′ microstructures. Cuboidal γ′ precipitates within a fcc-γ matrix are discovered in the Co-Ta-V system after aging for 2 h at 900 C, and in the Co-Nb-V system after cooling from homogenization at 1250 C. The compositions of these two new γ′-phases are measured via atom probe tomography as Co3(Ta0.76, V0.24) and Co3(Nb0.65, V0.35), respectively. Upon aging at 900 C, the γ′ precipitates coarsen, dissolve and transform to lamellar C36-Co3(Ta,V) and needle-shape D019-Co3(Nb,V), indicating that the γ′ phase is metastable. Various alloying additions are investigated to stabilize the γ′-phase, and quinary alloys are developed, which exhibit cuboidal γ′ precipitates within a fcc-γ matrix after aging at 850 C for 168 hours, with no precipitation of additional phases.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Rapid and Simplified Approach to Accurately Measure Single Crystal Elastic Constants
An ICME-base Investigation of the Homogenization of a Novel VIM/VAR Co-Ni Superalloy
Balancing the Property Suite in Co-base Superalloys
Creep Deformation Mechanisms and Compositional Changes in SX Co-base Superalloys Studied by Means of EM and APT
Crystal Plasticity Finite Element Approach to Modeling the Creep Behavior in Cobalt-based Superalloys
Development of Ni/Co Based Superalloys: CALPHAD and Materials Databases
Effect of Pre-deformation on the Aging Response of Co/Ni-base Superalloys
Effect of Tertiary Gamma Prime on the Creep Performance of a Developmental Co:Ni-Base Superalloy
Elemental Partitioning and Site-occupancy Behavior of Alloying Elements in γ/γ′-Strengthened Co-Ti based Alloys
Elucidating the Effects of Cr on the Microstructure, Oxidation Resistance and Mechanical Properties of Cobalt-based Superalloys
Exploration of Thermo-Mechanical Processing Parameters for a Polycrystalline γ-γ' Cobalt-base Alloy
Low Cycle Fatigue of Single Crystal γ'-Strengthened Co-based Superalloys at 750 °C in Air
M-13: Diffusion in FCC Co-rich Co-Cr-Ni-Ta Alloys
M-14: Effects of Cr and Al Additions on the Microstructure and Mechanical Properties of Co-Ti-W Based Alloys
M-15: The Effect of Titanium on the Tungsten-free Cobalt-base superalloys
Microstructural and Compositional Design of Multicomponent Co/Ni-based Superalloys using High-throughput Diffusion Multiples
Partitioning Preferences of Alloying Elements and their Effect on the Stability of the γʹ/L12-phase in Co-base Superalloys
Solute Segregation Effects at Planar Defects during Creep of CoNi-based Superalloys
Structural Evolution of a Single Crystal Co-base Superalloy during Creep at 1000C/137 MPa
The Effect of Long Term Exposure at Elevated Temperature on the Stability of a Novel Co-Ni Based Superalloy
The Formation of Protective Alumina on γ’-Strengthened Co-Ni-Al-Mo-Ta Alloys during Exposure at Elevated Temperatures
The Hunt for B and C in Grain Boundaries and their Role in Crack Tip Embrittlement
Thermophysical and Mechanical Properties of Multi-nary Single Crystalline Co-base Superalloys
Towards Developing a New Generation of Cobalt Based Superalloys
Wrought Co-base Superalloys – Mechanical Properties and Deformation Mechanisms
γ+γ′ Microstructures in W-free Co-Ta-V- and Co-Nb-V-based Systems

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