3D laser shock peening as a way to improve geometrical accuracy in selective laser melting
- 120 Downloads
One of the major drawbacks of selective laser melting (SLM) is the accumulation of tensile residual stresses (TRS) in the surface and subsurface zones of produced parts which can lead to cracking, delamination, geometrical distortions, and a decrease in fatigue life. 3D laser shock peening (3D LSP) is a novel hybrid method which introduces a repetitive LSP treatment during the manufacturing phase of the SLM process. In this paper, the ability of 3D LSP to convert TRS into beneficial compressive residual stresses and their subsequent effect on the geometrical accuracy of produced parts were investigated. Samples made of Ti6Al4V were manufactured with the 3D LSP process and treated with different processing parameters. Cuboidal samples were used for residual stress measurements, and the evolution of residual stresses was evaluated. Geometrical distortions were measured on bridge-like samples, and the influence on the final sample geometry was quantified. A significant improvement in geometrical accuracy resulting from reduced distortions was observed in all selected 3D LSP processing conditions.
Keywords3D laser shock peening Selective laser melting Laser shock peening Distortion Geometrical accuracy Ti6Al4V
Unable to display preview. Download preview PDF.
The generous support of PX Group to the LMTM laboratory is highly acknowledged.
This work was financially supported by the CTI project n°25357.2 PFNM-NM.
- 8.Vrancken B, Buls S, Kruth J.-P, and Van Humbeeck J, “Influence of preheating and oxygen content on selective laser melting of Ti6Al4V,” in Proceedings of the 16th RAPDASA Conference, 20151101Google Scholar
- 17.Kalentics N, Logé R, and Boillat E (2017) “Method and device for implementing laser shock peening or warm laser shock peening during selective laser melting,” US20170087670 A1Google Scholar
- 21.Hackel L, Rankin JR, Rubenchik A, King WE, and Matthews M (2018) “Laser peening: a tool for additive manufacturing post-processing,” Addit ManufGoogle Scholar
- 23.A. A. Antonysamy (2012) “Microstructure, texture and mechanical property evolution during additive manufacturing of Ti6Al4V alloy for aerospace applications,” [Thesis]. Manchester, UK: The University of Manchester; 2012, [Online]. Available: https://www.escholar.manchester.ac.uk/uk-ac-man-scw:160535. [Accessed: 12-Apr-2018]
- 25.(2018)“1709 CL 41TI ELI_layer.indd - Datasheet_CL_41TI_ELI.pdf.” [Online]. Available: https://www.concept-laser.de/fileadmin//user_upload/Datasheet_CL_41TI_ELI.pdf. [Accessed: 12-Apr-]
- 26.Kruth J-P, Badrossamay M, Yasa E, Deckers J, Thijs L, and Van Humbeeck J (2010) “Part and material properties in selective laser melting of metals,” presented at the Proceedings of the 16th International Symposium on ElectromachiningGoogle Scholar
- 28.Casavola C, Campanelli SL, Pappalettere C Experimental analysis of residual stresses in the selective laser melting process. In: Proccedings of the XIth International Congress and Exposition, Orlando. Florida, USA, p 2008Google Scholar
- 29.Renzi C, Panari D, and Leali F (2018) “Predicting tolerance on the welding distortion in a thin aluminum welded T-joint,” Int J Adv Manuf Technol, pp. 1–16Google Scholar
- 30.Mahapatra MM, Datta GL, Pradhan B, Mandal NR (2006) Three-dimensional finite element analysis to predict the effects of SAW process parameters on temperature distribution and angular distortions in single-pass butt joints with top and bottom reinforcements. Int J Press Vessel Pip 83(10):721–729CrossRefGoogle Scholar