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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Sustainability of High Temperature Alloys
Presentation Title Very high cycle fatigue life of Ni-based SX superalloy subjected to hot corrosion
Author(s) Luciana Maria Bortoluci Ormastroni, Fernando Pedraza, Jonathan Cormier
On-Site Speaker (Planned) Luciana Maria Bortoluci Ormastroni
Abstract Scope The impact of hot corrosion on the very high cycle fatigue life and the failure mode of the second-generation CMSX-4 Ni-based SX superalloy is investigated at high temperatures (1,000 °C). The hot corrosive Na2SO4 salt was deposited on (i) the bare substrate and (ii) Al-coated substrate. Both configurations lead to a fatigue life lower than the uncorroded reference material and distinct failure modes were observed. The corroded bond coat underwent a drastic reduction of the fatigue properties. Post-mortem analyses were carried to investigate the crack initiation mode under these severe conditions. The samples failed by three different mechanisms depending on the applied stress. The analyses suggests that under the conditions of 1,000 °C/20 kHz and fully reversed loading the bond coating exhibits a brittle mechanical behavior and that the Na2SO4 corrosion coupled with the premature crack damage leads to a direct attack on the substrate and a premature failure.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Environmental Effects, Mechanical Properties

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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