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Volume 25 Issue 8
Aug.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(8): 937-949
Xiao-ping Renand Zhan-qiang Liu, Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 937-949. https://doi.org/10.1007/s12613-018-1643-2
Cite this article as:
Xiao-ping Renand Zhan-qiang Liu, Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy, Int. J. Miner. Metall. Mater., 25(2018), No. 8, pp. 937-949. https://doi.org/10.1007/s12613-018-1643-2
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研究论文

Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy

  • School of Mechanical Engineering, Shandong University, Jinan 250061, China

  • Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, China

  • 通讯作者:

    Zhan-qiang Liu    E-mail: melius@sdu.edu.cn

  • 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.
    • Research Article

    Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy

    + Author Affiliations
      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 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.
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