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Meeting 10th International Symposium on Superalloy 718 and Derivatives (2023)
Symposium Superalloy 718 and Derivatives
Presentation Title Towards Enhancing Hot Tooling to Form High -𝛾′ Superalloys
Author(s) Arthi Vaasudevan, Enjuscha Fischer, Thomas Witulski, Catherine Rae, Enrique Galindo-Nava
On-Site Speaker (Planned) Arthi Vaasudevan
Abstract Scope Ni-superalloys are overwhelmingly relied upon in aerospace, power generation and automotive sectors, yet, are seldom considered as materials for hot tooling. The operational conditions of hot forming dies potentially exceed those experienced by aircraft turbine discs. Fortunately, new disc alloys have pronounced elevated temperature capabilities and the current study focuses on implementing two advanced alloys, VDM 780 and Haynes 282 (H282) as hot tool materials. There is, however, inadequate evidence of their life-limiting properties and mechanisms in the in-service temperature regime of 700 – 900 ║C. Thus, realistic operating conditions were replicated by combining interrupted short and long-term thermal-mechanical tests. To begin, isothermal ageing in the furnace, assisted in comparing the extent of 𝛾′ coarsening between the alloys, and subsequent in-situ ageing and compression testing reflected the accompanying loss in strength. Compression creep testing at stresses near appropriate yield point (250 – 750 MPa) revealed accelerated creep rates at high temperatures with creep behaviour directly transitioning from primary to tertiary regime, the steady-state creep region being absent. The results indicated that even as exposure duration, temperature, and applied stress all influence microstructural evolution, the exposure temperature was pivotal in determining the effective life of these 𝛾′-strengthened alloys. Dissolution kinetics of γ' around near-solvus temperatures was crucial and was governed by elemental additions. As a result, the research paves the way for better understanding and design of superalloys with improved thermal integrity for hot tooling.
Proceedings Inclusion? Definite: At-meeting proceedings


Abnormal Grain Growth Maps of Wrought Ni-base Superalloys
Alloy Design and Development of a Novel Ni-Co Based Superalloy GH4251
An ICME Framework to Predict the Microstructure and Yield Strength of INCONEL 718 for Different Heat Treatments
Application of Computational Materials and Process Modeling to Current and Future Aero-engine Component Development and Validation
Applied Calphad to IN718 and its Cast & Wrought Successors - a Physics Based Approach with Implications for Phase Stabilities, Precipitation and Microstructural Modeling
Characterization of Laser Powder Bed Fusion of Nickel Based Superalloy Haynes 282
Characterization of the Anisotropic Behaviour of Inconel 718 Parts Manufactured by Wire Arc Additve Manufacturing
Characterization of γ′ Precipitation Behavior in Additively Manufactured IN738LC Superalloy via In-situ Small-angle Neutron Scattering
Chemical Mapping of Superalloys at the Nanoscale
Compatibility of Wrought Superalloys with Supercritical CO2
Competitor Ti-comprising Refractory High Entropy Alloys to Superalloy 718 for Aeroengine Applications
Correlating Alloy 718 and Haynes 282 Solidification Microstructures to Local Thermal History using Laser Powder Bed Fusion Process Monitoring
Design of Graded Transition Interlayer for Joining Inconel 740H Superalloy with P91 Steel using Wire-arc Additive Manufacturing
Effect of Heat Treatment on the Mechanical Property and Deformation Mechanism of a Novel Cast Nickel-base Superalloy
Effect of Pre-straining on the Tensile and Stress-rupture Properties of a Novel Ni-Co Based Superalloy
Effect of Short-term Isothermal Exposure on the Ductility Signature of Waspaloy in the Temperature Range of 750-950░C – A Comparison with Haynes« 282«
Effects of High-temperature Oxidation on Fatigue Life of Additive-manufactured Alloy 625
Effects of Scan Strategy Induced Microstructural Differences on Thin-wall SLM IN718 Fatigue Performance
Fabrication and Weldability Aspects of Ni- and Ni-Fe Based Superalloys – A Review
Factors Influencing Propensity for Stress Relaxation Cracking in Inconel « Alloy 740H« and Practical Guidance for Applications
High-temperature Properties of Alloy 718 Made by Laser Powder-bed Fusion
Hot Corrosion Behavior of a GH4720Li Disk Superalloy at 700℃
In-situ HT-EBSD Measurements and Calibration of Multi-class Model for Grain Growth and δ-phase Dissolution Kinetics of Alloy 718
IN718 Cold Gas Repair Spray of Large Cavities – Microstructure and Residual Stresses
Influence of Morphology and Size Distribution of Haynes 230 Particles on the Powder Spreading Behavior and Performance on Selective Laser Melting
Investigating Deformation Mechanisms in a Creep-deformed 718-variant Superalloy
Investigating the Influence of Build Parameters and Porosity on Fatigue of AM IN718
Keyhole TIG Welding of New Co-lean Nickel-based Superalloy G27
Linking Stress Rupture Properties to Processing Parameters of HAYNES« 718 Nickel Superalloy via Machine Learning
Local Assessment of Mechanical Properties in Forged Alloy 718 Components Based on the Simulation of the Microstructure Evolution During Production
Long Term Thermal Stability and Oxidation Resistance of HAYNES 233 Alloy
Manufacturing Large Superalloy Pipe Bends
Mechanical and Microstructural Properties of Brazed Honeycomb Liner Material Haynes 214
Meeting the Challenges of the Future by Understanding Our Past
Microstructural and Tensile Properties Evolutions of Direct-aged Waspaloy Produced by Wire Arc Additive Manufacturing
Microstructural Stability and Strengthening Mechanism of a Ferritic Fe-Cr-Ni-Al Superalloy Containing Cuboidal B2 Nanoparticles
Microstructure and Mechanical Properties of Selective Laser Melting Processed TiC/GTD222 Nickel-based Composite
Microstructure Evolution During Post-heat Treatment of Haynes 282 Alloy Processed by Wire-arc Additive Manufacturing
Multi-variate Process Models for Predicting Site-specific Microstructure and Properties of Inconel 706 Forgings
Preferential γ' Precipitation on Coherent Annealing Twin Boundaries in Alloy 718
Segregation and Freckles in Alloy 718 and Related Alloys
Subcritical Crack Growth of 718 Alloy in Marine Exposure Conditions and Microstructural Modeling
Surface Roughness of Additively Manufactured IN718 & H282 Superalloys from Multi-size and Multi-laser Machines
Tailoring the γ- γ′-γ″ Dual Superlattice Microstructure of Ni-based Superalloy IN725 by High Temperature Aging and Nb/Ta Additions for Superior Creep Properties
Tensile Performance of Direct Energy Deposited IN718 and Oxide Dispersed Strengthened IN718
Tensile Properties of Inconel 718 Produced by LMD-Wire
The Effect of Microstructure on the Strength of VDM Alloy 780
Towards Enhancing Hot Tooling to Form High -𝛾′ Superalloys
Understanding Annealing Behavior during Post-build Heat Treatment of Ni-based Alloys Across Additive Manufacturing Processes

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