期刊
MATERIALS & DESIGN
卷 194, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.108851
关键词
Surface integrity; Laser-assisted machining; Residual stress; Chip formation; Fatigue life
资金
- Clean Sky 2 Joint Undertaking under the European Union's Horizon 2020 research and innovation programme [754807]
- Nottingham research fellowship programme
- H2020 Societal Challenges Programme [754807] Funding Source: H2020 Societal Challenges Programme
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 (IAMBI) 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. (C) 2020 The Author(s). Published by Elsevier Ltd.
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