Micromechanism of cyclic plastic deformation of alloy IN 718 at 600 °C
| Autor: | Neeta Paulose, Amborish Banerjee, Jitendra Kumar Sahu, R N Ghosh, C D Fernando |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy Lüders band 02 engineering and technology Slip (materials science) Plasticity engineering.material 021001 nanoscience & nanotechnology Microstructure chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials engineering Niobium carbide General Materials Science Deformation (engineering) 0210 nano-technology Inconel |
| Zdroj: | Fatigue & Fracture of Engineering Materials & Structures. 39:877-885 |
| ISSN: | 8756-758X |
| DOI: | 10.1111/ffe.12406 |
| Popis: | In the present investigation, an attempt was made to understand the cyclic deformation micromechanism of gas turbine alloy Inconel 718 at 600 °C (i) by conducting low cycle fatigue and creep–fatigue interaction tests and (ii) by studying the microstructure evolution in the material during fatigue tests through extensive electron microscopy. Bilinear slope was obtained in the Coffin–Manson plot for all low cycle fatigue tests, and it was confirmed through transmission electron microscopic examination that microtwinning was the predominant mode of deformation at low plastic strain values, whereas slip and shearing of γ″ precipitates were the predominant mode of deformation at higher plastic strain values. Fatigue life was adversely affected when hold time was introduced at peak tensile strain during creep–fatigue interaction tests. Formation of stepped interface at microtwin boundaries and coarsening of niobium carbide precipitates were observed to be the major microsturctural changes during creep–fatigue interaction tests. |
| Databáze: | OpenAIRE |
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