doi: 10.52899/24141437_2025_03_375
UDK: 621.791.92

Design Methods Used to Minimize Residual Stresses in Direct Laser Deposition

Иванов С. Ю. Article language: English
Citation Link: Ivanov SYu. Design Methods Used to Minimize Residual Stresses in Direct Laser Deposition. Transactions of the Saint Petersburg State Marine Technical University. 2025;4(3):375–384. DOI: 10.52899/24141437_2025_03_375 EDN: GTHNVG

Annotation

BACKGROUND: In the additive manufacturing of hardening alloy products, they are often destroyed. This is caused by an unfavourable combination of metallurgic factors and high processing stresses. When manufacturing large sized industrial structures by direct laser deposition, it is impossible to ensure a favorable phase structure and mechanical properties of the deposited metal due to the low interpass temperature and high cooling rate. In this case, to prevent structural damage, it is required to reduce stress and deformation. AIM: To empirically analyze the efficiency of local deposit geometry and local chemical composition modification to reduce residual stresses and deposition deformations simulating the manufacturing of large-sized structures by direct laser deposition. METHODS: We analyze wall-type deposits made of Ti-6Al-4V alloy with two types of fillets (flat and concave) on the ends. We also describe a wall-type deposit without fillets with a gradient transition from a soft layer of pure titanium to a significantly stronger Ti-6Al-4V layer. To determine stresses and deformations in deposits, a numerical direct laser deposition model was developed. Interlinked problems of heat conduction in a non-stationary formulation and the quasi-static problem of thermallyinduced plasticity were solved by the finite element method. RESULTS: The flat fillets added to the ends of the deposit has little effect on the magnitude of residual stresses and accumulated plastic deformations. Concave fillets significantly reduce plastic deformation, ensuring the manufacturing of defect-free deposits. The most effective approach was to add a less durable but more plastic interlayer between the rigid substrate and the deposit made of a stronger alloy. In this case, the highest level of accumulated plastic deformations is achieved at the ends of the deposit in the soft interlayer region and depends little on the interlayer length. The stronger part of the Ti-6Al-4V deposit has no effective plastic deformation. CONCLUSION: It was demonstrated that numerical modeling using local deposit geometry and chemical composition modifications allow to significantly reduce residual stresses and plastic deformations in deposits manufactured by direct laser deposition. Keywords: additive manufacturing; direct laser deposition; residual stresses; finite element method; titanium alloys.

Bibliography

1. DebRoy T, Wei HL, Zuback JS, et al. Additive manufacturing of metallic components-Process, structure and properties. Prog Mater Sci. 2018;92:112–224. doi: 10.1016/j.pmatsci.2017.10.001 EDN: YIDPUX
2. Sames WJ, List FA, Pannala S, et al. The metallurgy and processing science of metal additive manufacturing. International Materials Review. 2016;61(5):315–360.
3. Song T, Dong T, Lu SL, et al. Simulation-informed laser metal powder deposition of Ti-6Al-4V with ultrafine ?-? lamellar structures for desired tensile properties. Additive Manufacturing. 2021;46. doi: 10.1016/j.addma.2021.102139 EDN: WVVVAC
4. Chen J, Fabijanic D, Zhang T, et al. Deciphering the transformation pathway in laser powder-bed fusion additive manufacturing of Ti-6Al-4V alloy. Additive Manufacturing. 2022;58. doi: 10.1016/j.addma.2022.103041 EDN: VMLDHD
5. Babkin K, Zemlyakov E, Ivanov S, et al. Distortion prediction and compensation in direct laser deposition of large axisymmetric Ti-6Al-4V part. Procedia CIRP. 2020;94:357–361. doi: 10.1016/j.procir.2020.09.145 EDN: MJGCHJ
6. Turichin G, Zemlyakov E, Babkin K, et al. Analysis of distortion during laser metal deposition of large parts. Procedia CIRP. 2018;74:154–157. doi: 10.1016/j.procir.2018.08.068 EDN: LSGWIV
7. Gouge M, Michaleris P. Thermo-mechanical modeling of additive manufacturing. Oxford: Butterworth-Heinemann; 2017.
8. Ivanov S, Artinov A, Zemlyakov E, et al. Spatiotemporal evolution of stress field during direct laser deposition of multilayer thin wall of Ti-6Al-4V. Materials. 2022;15(1). doi: 10.3390/ma15010263 EDN: YQUHPT
9. Radaj D. Heat effects of welding. Berlin: Springer; 1992.
10. Masubuchi K. Analysis of welded structures: residual stresses, distortion, and their consequences. Oxford: Pergamon; 1980.
11. Honnige JR, Colegrove P, Williams S. Improvement of microstructure and mechanical properties in Wire + Arc Additively Manufactured Ti-6Al-4V with Machine Hammer Peening. Procedia Engineering. 2017;216:8–17. doi: 10.1016/j.proeng.2018.02.083
12. Colegrove P, Coules H, Fairman J, et al. Microstructure and residual stress improvement in wire and arc additively manufactured parts through high-pressure rolling. Journal of Materials Processing Technology.
2013;213(10):1782–1791. doi: 10.1016/j.jmatprotec.2013.04.012
13. Honnige JR, Colegrove PA, Ganguly S, et al. Control of residual stress and distortion in aluminium wire + arc additive manufacture with rolling. Additive Manufacturing. 2018;22:775–783.
14. Lu X, Chiumenti M, Cervera M, et al. Mitigation of residual stresses and microstructure homogenization in directed energy deposition processes. Engineering with Computers. 2022;38:4771–4790. doi: 10.1007/s00366-021-01563-9 EDN: BCYCHE
15. Lu X, Chiumenti M, Cervera M, et al. Substrate design to minimize residual stresses in Directed Energy Deposition AM processes. Materials and Design. 2021;202. doi: 10.1016/j.matdes.2021.109525 EDN: TZILGQ
16. Turichin GA, Klimova-Korsmik OG, Babkin KD, Ivanov SY. Additive manufacturing of large parts. In: Pou J, Riveiro A, Paulo Davim J. (eds) Additive Manufacturing. Elsevier; 2021:531–568.
17. Reichardt A, Shapiro A, Otis R, et al. Advances in additive manufacturing of metal-based functionally graded materials. International Materials Reviews. 2021;66(1):1–29. doi: 10.1080/09506608.2019.1709354EDN: YXAFMH
18. Ivanov S, Gushchina M, Artinov A, et al. Effect of elevated temperatures on the mechanical properties of a direct laserdeposited ti-6al-4v. Materials. 2021;14(21). doi: 10.3390/ma14216432 EDN: NDMMSA
19. Mukherjee T, Zhang W, DebRoy T. An improved prediction of residual stresses and distortion in additive manufacturing. Comput. Mater. Sci. 2017;126:360–372. doi: 10.1016/j.commatsci.2016.10.003
20. Mills KC. Recommended values of thermophysical properties for selected commercial alloys. Cambridge: Woodhead Publishing; 2002.
21. Moiseyev VN. Titanium alloys: russian aircraft and aerospaceapplications. New York: CRC Press; 2005.
22. Gushchina MO, Kuzminova YO, Dubinin ON, et al. Multilayer composite Ti-6Al-4 V/Cp-Ti alloy produced by laser direct energy deposition. Int. J. Adv. Manuf. Technol. 2023;124:907–918. doi: 10.1007/s00170-022-10521-8 EDN: QSNQIR