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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Sustainability of High Temperature Alloys
Presentation Title Microstructural Characterization of René N4 After Rejuvenation Heat Treatment
Author(s) Cristina Motta, Francesco Mastromatteo, Elisabetta Gariboldi, Filippo Cappuccini
On-Site Speaker (Planned) Cristina Motta
Abstract Scope Gas turbine blades are critical components, exposed to high temperatures and stresses during their service life. When they reach their serviceable limit, their replacement has an important impact in terms of cost and sustainability. However, the application of a rejuvenation heat treatment cycle, customized for the specific material, could extend their service life. In the framework of the last generation gas turbine, a particular focus is on the life extension of René N4 components. The aim is to develop a rejuvenation cycle capable to restore the original microstructure while keeping under control the recrystallization phenomenon. This work describes the exploration and then the optimization of such rejuvenation heat treatment. The first experimental campaign led to the definition of a suitable temperature window for the solutioning step. The second DOE had the aim to fine tune the rejuvenation cycle and perform a microstructure characterization after heat treatment application.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Characterising the effect of environment and salt concentration on the fatigue life of a nickel disc alloy
Composition optimization of Inconel 718 via cluster formula and experimental verification
Development of Direct Recycling Technique for Advanced Ni-base Single Crystal Superalloys
Effects of an oxidising environment on the dwell fatigue of single crystal Ni-based superalloys at intermediate service temperature
Effects of Fe substitution on CoNi-based superalloys
Effects of residual Ca content on the mechanical response of a new polycrystalline Ni-base superalloy
Enhancement of crack propagation resistance by healing treatment in boron containing FeNi-base superalloy
Evaluation of Forming Stability and Crack Resistance in Inconel 718 Under Heat Treatment Conditions in Hot Forging Processes
Extending Service Life through Location Specific Lifing of Components
Frequency and Directionality of the Onset of Heteroepitaxial Recrystallization
Heat-Resistant Nickel Alloy ЖС3ДК-ВІ Modification with Titanium Carbonitride Ultrafine Powders
Microstructural and mechanical properties evolution of extremely long-term thermal exposed Superalloy MarM247 after rejuvenation heat treatment
Microstructural Characterization of René N4 After Rejuvenation Heat Treatment
Microstructure, Mechanical, Oxidation and Electrochemical Behavior of Thermo-Plastically Deformed High Entropy Alloys
Novel Environmentally Friendly Cr-Si Slurry Coatings for Turbine Applications
Optimization of Ductility and Creep Life of Inconel 939-Type Nickel-Based Superalloys
Phase-field-informed micromechanical approach to creep behavior in Ni-based single-crystal superalloys at the dendritic scale
Pushing the temperature limit of nickel-based superalloy
Recrystallization criteria for Nickel-based single cristal superalloys
Recycling and Element Recovery in Nickel-base Superalloys
Relationship between manufacturing parameters and creep performance of Inconnel718 fasteners
Remanufacturing and Repair of Superalloys: A Focus on Alloy 718
Simulation of the mechanical behavior during solidification and possible recrystallization during heat treatment stages of a nickel-based single-crystal superalloys
Temperature and Size Dependent Mechanical Properties of Additively Manufactured GRX-810
Very high cycle fatigue life of Ni-based SX superalloy subjected to hot corrosion

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