Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy |
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| Authors: | Xiao-ping Ren Zhan-qiang Liu |
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| Affiliation: | 1.School of Mechanical Engineering,Shandong University,Jinan,China;2.Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education,Shandong University,Shandong,China |
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| Abstract: | 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 quanti-tatively 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 ana-lyzed. 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. |
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