Knowledge & Skills
Materials Engineering, 25th of June 2022, 020003

Surface integrity in machining aerospace materials, and its impact on functional performance

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Aerospace Manufacturing Technology Center (AMTC), National Research Council of Canada (NRC), Canada

Associate editor: J. C. Outeiro

*Corresponding author: [email protected]

https://doi.org/10.53229/k.and.s.2021.020003

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Helmi Attia and Bin Shi

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Abstract

Content

Surface integrity is one of the most critical output of a machining operation. It has significant impact on the safety, performance, and fatigue life of aerospace components subjected to dynamic loads in harsh environments. The typical aspects of machining-induced integrity including residual stresses, surface roughness and defects, microhardness, near-surface microstructure modification, dynamic recrystallisation and grain refinement are discussed and correlated to the variables of machining system. Special attention is paid to how to control the machining-induced residual stresses by optimizing the cutting parameters, tool geometry, and the cooling strategy. Post-processing options, such as shot peening, burnishing and laser-assisted surface treatment are discussed as means for mitigating induced surface defects and for further improving surface integrity.

The fundamental aspects of residual stress formation during cutting are discussed in relation to: (a) the contribution of thermal and mechanical loads and (b) the effect of the coupling of thermal load and phase transformation. In addition to its effect on fatigue life reduction, the effect of machining-induced residual stresses on the distortion of thin-walled aerospace components is assessed in comparison with the magnitude of distortion produced by the bulk stresses. An overview of the effect of cryogenic cooling strategy of selected difficult-to-machine materials, aerospace alloys, and lightweight materials on machining-induced residual stresses is presented and compared to dry, minimum quantity lubrication, and flood cooling.

Keywords:
Surface integrity, aerospace materials, functional performance and life, Inconel 718, manufacturing processes


Duration: 

23 minutes video  


Language:
English    


Support:
video

References

(1) Ulutan et al., 2011, Machining induced surface integrity in titanium and nickel alloys: A review, International Journal of Machine Tools & Manufacture, 51, pp. 250–280, doi:10.1016/j.ijmachtools.2010.11.003

(2) Schnubel, D., 2012, Laser heating as approach to retard fatigue crack growth in aircraft aluminum structures, Thesis dissertation, Technische Universität Hamburg, doi:10.15480/882.1070

(3) Masubuchi, K., 2013. Analysis of welded structures: residual stresses, distortion, and their consequences (Vol. 33). Elsevier.

(4) Damir, A., Shi, B. and Attia, M.H., 2019. Flow characteristics of optimized hybrid cryogenic-minimum quantity lubrication cooling in machining of aerospace materials. CIRP Annals, 68(1), pp.77-80. doi: 10.1016/j.cirp.2019.04.047

(5) Sharman, A.R.C., Hughes, J.I. and Ridgway, K., 2006. An analysis of the residual stresses generated in Inconel 718™ when turning. Journal of Materials Processing Technology, 173(3), pp.359-367, doi: 10.1016/j.jmatprotec.2005.12.007

(6) Smart, E.F. and Trent, E.M., 1975. Temperature distribution in tools used for cutting iron, titanium and nickel. The International Journal of Production Research, 13(3), pp.265-290, doi: 10.1080/00207547508942996.

(7) Damir, A., Shi, B., Elsayed, A., Attia, M. H., Effect of cryogenic machining on surface integrity of Inconel 718, RNC Internal Report, AMTC-MR-19, 2020

Full presentation

Citation

H. Attia and B. Shi, 2022, « Surface integrity in machining aerospace materials, and its impact on functional performance», Knowledge and Skills, ISSN 2800-2083, Materials Engineering, 020003, https://doi.org/10.53229/k.and.s.2021.020003

Surface integrity in machining aerospace materials, and its impact on functional performance
presented by Pr. Helmi Attia

 

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