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Experimental study on surface integrity of Inconel 690 milled by coated carbide inserts

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Abstract

One of the major concerns in the field of machinery manufacturing of Ni-based superalloys is machining-induced surface integrity, since the surface integrity is closely bound up with the service performance of machined components. In the current study, a range of orthogonal experiments are carried out to investigate the surface integrity characteristics, including surface morphology, surface roughness, residual stress, work hardening, and surface microstructure during high-speed milling of Inconel 690. The results show that both cutting speed and feed rate plays a constructive role in determining cutting force and surface integrity of Inconel 690. The cutting force displays a downtrend with the increase of cutting speed while presents an uptrend with the increase of feed rate as well as depth of cut. While, no clear tendency between the relative position of tool and workpiece and the cutting force could be found. The surface roughness decreases firstly and then increases slightly with the increase of cutting speed while increases with the increase of feed rate. The surface residual stress presents more tensile tendency as the cutting speed and feed rate increase. Similarly, the increased cutting speed and feed rate strengthen the degree of work hardening as well as depth of work hardening. It is worth mentioning that not only the depth of cut but also the relative position of tool and workpiece has little effect on surface integrity. Severe plastic deformation occurs in the microstructure of machined surface layer. No phase transformation is observed at all workpiece surface. This study provides a meaningful chance to achieve excellent machining-induced surface integrity via selecting suitable cutting parameters.

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Funding

This work is financially supported by Scientific Research Project for National High-level Innovative Talents of Hebei Province Full-time Introduction (2021HBQZYCXY004), National Natural Science Foundation of China (52075300), Major Program of Shandong Province Natural Science Foundation (ZR2018ZA0401), Independent Training and Innovation Team Project of **an Science and Technology Bureau (2019GXRC009) and Leading Talents of Science and Technology Innovation in National Ten Thousand Talents Program ([2018]29).

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Zhen Chen: methodology, investigation, data curation, formal analysis, visualization, writing—original draft preparation. Chuanzhen Huang: supervision, conceptualization, writing—review and editing, funding acquisition. Binghao Li: supervision, writing—reviewing and editing. Guoyan Jiang: supervision, writing—review and editing. Zhengyi Tang: writing—reviewing and editing. Jiahui Niu: writing—reviewing and editing. Hanlian Liu: supervision, writing—review and editing.

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Correspondence to Chuanzhen Huang.

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Chen, Z., Huang, C., Li, B. et al. Experimental study on surface integrity of Inconel 690 milled by coated carbide inserts. Int J Adv Manuf Technol 121, 3025–3042 (2022). https://doi.org/10.1007/s00170-022-09456-x

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  • DOI: https://doi.org/10.1007/s00170-022-09456-x

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