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Effects of Machining Parameters on Surface Integrity when Turning Inconel 718

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Abstract

When cutting nickel-based alloys, the machining parameters significantly influence the surface integrity. This paper describes face-turning experiments using the nickel-based alloy Inconel 718 with two types of inserts. The effects of various turning parameters on the surface roughness, residual stress, microhardness, and microstructure of the alloy samples are investigated for both ceramic and carbide inserts. A quadratic surface roughness response model incorporating the cutting speed, cutting depth, and feed rate is developed, and the micromechanics and microstructure in the turned subsurface are analyzed under three levels of cutting parameters. The results show that a smoother, more uniform surface is obtained when using a ceramic insert. The residual stress and microhardness distributions induced by the carbide and ceramic inserts are similar. The residual stress layer is about 80 µm thick and the work-hardened layer has a thickness of around 70 µm. No severe plastic deformation is observed with either the carbide or ceramic insert. Generally, the ceramic insert is more suitable for turning Inconel 718 than the carbide insert. A low cutting speed, moderate cutting depth, and moderate feed rate are found to produce excellent surface integrity characteristics.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China [Grant Nos. 51905440, 51875472, and 91860206], the National Science and Technology Major Project of China [Grant No. 2017-VII-0001-0095], and the Key Research and Development Program of Shaanxi Province [Grant No. 2021ZDLGY10-06].

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Authors and Affiliations

  1. Key Laboratory of High Performance Manufacturing for Aero Engine (Northwestern Polytechnical University), Ministry of Industry and Information Technology, Xi’an, People’s Republic of China

    Liang Tan, Changfeng Yao, Yi Fan & Minchao Cui

  2. Engineering Research Center of Advanced Manufacturing Technology for Aero Engine (Northwestern Polytechnical University), Ministry of Education, Xi’an, People’s Republic of China

    Liang Tan, Changfeng Yao, Yi Fan & Minchao Cui

  3. Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, People’s Republic of China

    Xiangyu Li

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Tan, L., Yao, C., Li, X. et al. Effects of Machining Parameters on Surface Integrity when Turning Inconel 718. J. of Materi Eng and Perform 31, 4176–4186 (2022). https://doi.org/10.1007/s11665-021-06523-4

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