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

Xiao-ping Ren; Zhan-qiang Liu

doi:10.1007/s12613-018-1643-2

Volume 25 Issue 8

Aug. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(8): 937-949

Xiao-ping Ren and 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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Xiao-ping Ren and 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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Research Article

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

Xiao-ping Ren^1,2 and
Zhan-qiang Liu^1,2,

+ Author Affiliations

Corresponding author:
Zhan-qiang Liu E-mail: melius@sdu.edu.cn
Received: 9 January 2018; Revised: 27 March 2018; Accepted: 29 March 2018

Abstract

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.
- grain refinement;
- dislocation-twin interaction;
- work hardening;
- turning;
- Inconel 718

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