Investigation of surface integrity in laser-assisted machining of nickel based superalloy

Xu, Dongdong and Liao, Zhirong and Axinte, Dragos and Sarasua, Jon Ander and M'Saoubi, Rachid and Wretland, Anders (2020) Investigation of surface integrity in laser-assisted machining of nickel based superalloy. Materials & Design, 194 . p. 108851. ISSN 02641275

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Abstract

While laser-assisted machining can significantly improve the machinability of nickel-based superalloy, the mechanism of surface integrity evolution and its influence on the material functional performance is still not clear. The present study gives a comprehensive investigation on the surface integrity of laser-assisted milling (LAMill) process with an in-depth study of the mechanism of chip formation, microstructural and mechanical alternations, supported by key outcomes from the two constitutive processes, conventional milling (CMill) and single laser scanning (LS). Although the high thermal affected layer in LAMill process has been removed through the cutting chips, a significant bending effect has been found in both the LAMill and LS workpiece. More interestingly, a combined impact of the residual stress from LS and CMill has been found on LAMill workpiece while a lattice evolution has been revealed regarding both the thermal and mechanical influence. Specifically, inadequate fatigue performance on LAMill and LS workpiece has been found due to the high thermal effect in the superficial layer regarding the residual tensile stress distribution and microstructure variation. While LAMill is generally considered as a promising machining method with improved machinability of difficult-to-cut materials, this research shows a poor workpiece functional performance (fatigue) and justifies its application prospect.

Item Type: Article
Keywords: Surfaceintegrity;Laser-assistedmachining;Residualstress;Chipformation; Fatiguelife
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering
Identification Number: https://doi.org/10.1016/j.matdes.2020.108851
Depositing User: QIU, Lulu
Date Deposited: 19 Aug 2020 03:42
Last Modified: 19 Aug 2020 03:42
URI: http://eprints.nottingham.ac.uk/id/eprint/61361

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