Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy
| Autor: | Zhan-qiang Liu, Xiao-ping Ren |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Materials science Mechanical Engineering Metals and Alloys 02 engineering and technology Work hardening Strain rate 021001 nanoscience & nanotechnology Microstructure Superalloy 020901 industrial engineering & automation Machining Geochemistry and Petrology Mechanics of Materials Materials Chemistry Dynamic recrystallization Deformation (engineering) Composite material 0210 nano-technology Inconel |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 25:937-949 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-018-1643-2 |
| Popis: | The microstructural changes in the machined surface layer of Ni-based super alloys essentially determine the final performance of the structural components of aerospace engines in which these alloys are used. In this work, multiscale metallurgical observations using scanning electron microscopy, electron-backscatter diffraction microscopy, and transmission electron microscopy were conducted to quantitatively characterize the microstructure of the machined subsurface. Next, to elucidate the factors that affect the formation of the refinement microstructure, the distributions of the deformation parameters (strain, strain rate, and temperature) in the machined subsurface were analyzed. A dislocation-twin interaction dynamic recrystallization mechanism for grain refinement during machining of Inconel 718 is proposed. Furthermore, microhardness evolution induced by grain refinement in the machined surface is evaluated. The results suggest that the gradient microstructure and the work hardening can be optimized by controlling the cutting parameters during turning of Inconel 718. |
| Databáze: | OpenAIRE |
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