Study of Microstructural Evolution of AEREX 350 Alloy During High Temperature Ttensile Testing

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Keshishi, Armen | 2024

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 56867 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Asgari, Sirous
Abstract:
In this study, samples of wrought nickel-cobalt superalloy AEREX350 underwent hot tensile testing at temperatures ranging from 500 to in the solution-treated state, with subsequent investigation into their mechanical properties and microstructural changes. Anomalous yield strength behavior was observed in this alloy, characterized by an initial decrease in yield stress with rising temperature, followed by an increase and subsequent decrease. Similarly, the ultimate tensile strength exhibited a similar trend to the yield stress. Conversely, ductility parameters demonstrated an inverse relationship with alloy strength. Notably, the alloy displayed a pronounced work-hardening rate at 800 °C. Examination of the microstructure via transmission electron microscopy (TEM) revealed the involvement of dislocation slip, Suzuki segregation, twin formation, and γ’ particle precipitation mechanisms in the work-hardening process of this alloy. Furthermore, it was noted that at elevated temperatures, hardening mechanisms were deactivated, and the impact of γ’ precipitates on strength diminished due to coarsening
Keywords:
Aerex 350 Superalloy ; Microstructure ; Transmission Electron Microscope ; Hot Tensile ; Nickel-Base Superalloy ; Tensile Strength

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