EFFECT OF ALLOYING ELEMENTS AND HEAT TREATMENT ON FATIGUE CRACK GROWTH BEHAVIOR OF FE-NI-BASED SUPERALLOYS

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Seher_Topuz_Master_Thesis.pdf

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2022-12-02

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Topuz, Seher

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Fe-Ni-based superalloys are characterized by high strength, toughness, and corrosion resistance materials at room and elevated temperature applications. They are generally used in many parts requiring high toughness and ductility, such as aerospace, industrial gas turbine, and industrial components. The mechanical properties of Fe-Ni-based superalloys depend on three main effects. These alloying elements are added to the structure, working processes, and heat treatment. This study investigates the effect of alloying elements after heat treatment on the characterization and fatigue crack growth behavior of three Fe-Ni-based superalloys with different compositions. The results show that Fe-Ni-based superalloys with different chemical compositions and production routines give different heat treatment mechanisms respond to the same heat treatment parameters. Also, the effect of γ’ formation and carbide precipitation on the mechanical properties of different Fe-Ni-based superalloys are discussed with heat treatment.

Subject Keywords

Fe-Ni based superalloy, heat treatment, fatigue crack growth, alloying elements

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https://hdl.handle.net/11511/101870

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Topuz, “EFFECT OF ALLOYING ELEMENTS AND HEAT TREATMENT ON FATIGUE CRACK GROWTH BEHAVIOR OF FE-NI-BASED SUPERALLOYS,” M.S. - Master of Science, Middle East Technical University, 2022.