Abstract
In laser direct forming, part geometry especially the curvature radius has a significant effect on the residual stress of the fabricated parts. But few people have studied the effect of part geometry especially curvature radius on residual stress. Here, a three-dimensional FE model is developed to analyze the temperature and residual stress in laser direct forming. The effect of curvature radius on the circumferential stress and vertical (z direction) stress during the fabrication of thin-walled cylinder parts are studied numerically and experimentally. The simulation results show that the curvature radius has obvious effect on temperature gradients in different directions in the process of laser direct forming. The vertical temperature gradient declines significantly with the increase of curvature radius, which leads to a relatively stable residual stress distribution in vertical directions after a declining tendency in the initial stage. However, the circumferential temperature gradient increases significantly with curvature radius, resulting in a gradually stable vertical residual stress after an increasing tendency in the initial stage. The experimental results show good agreement with the simulation. The results show great significance for process optimization of complex parts fabricated by laser direct forming and provide some guidance for the designation of structure of parts fabricated by this technology.
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Capello E, Castelnuovo M, Previtali B, Vedani M (2007) Surface treatment of welded duplex stainless steels by diode laser. J Laser Appl 19(3):133–140. doi:10.2351/1.2567412
Capello E, Previtali B (2009) Enhancing dual phase steel formability by diode laser heat treatment. J Laser Appl 21(1):1–9. doi:10.2351/1.3071316
Yang YS, Na SJ (1989) A study on residual stresses in laser surface hardening of a medium carbon steel. Surf Coat Technol 38(3):311–324. doi:10.1016/0257-8972(89)90093-5
Neela V, De A (2009) Three-dimensional heat transfer analysis of LENS™ process using finite element method. Int J Adv Manuf Technol 45:935–943. doi:10.1007/s00170-009-2024-9
Zhu GX, Zhang AF, Li DC, Tang YP, Tong ZQ, Lu QP (2011) Numerical simulation of thermal behavior during laser direct metal deposition. Int J Adv Manuf Technol 55:945–954. doi:10.1007/s00170-010-3142-0
Wang L, Felicelli SD, Pratt P (2008) Residual stresses in LENS-deposited AISI 410 stainless steel plates. Mater Sci Eng 496(1):234–241. doi:10.1016/j.msea.2008.05.044
Moat RJ, Pinkerton AJ, Li L, Withersa PJ, Preussa M (2011) Residual stresses in laser direct metal deposited Waspaloy. Mater Sci Eng 528(6):2288–2298. doi:10.1016/j.msea.2010.12.010
Griffith ML, Schlienger ME, Harwell LD, Oliver MS, Baldwin MD et al (1999) Understanding thermal behavior in the LENS process. Mater Des 20(2):107–113. doi:10.1016/S0261-3069(99)00016-3
Wang K, Zhao JF, Pan H, Liu YL (2013) Influence of repair cross section on stress-field distribution in the nickel-based superalloy laser remanufacturing. Laser Optoelectron Prog 50(4):041402
Kong Y, Liu WJ, Wang YC, Bian HY, Zhao YH (2011) Numerical simulation of temperature field and stress field of direct laser metal deposition shaping process of titanium alloys. J Mech Eng 47(24):74–82
Carslaw HS, Jaeger JC (1959) Conduction of heat in solids. Clarendon Press, Oxford, UK, 1959, 134
Yang SH, Tao WQ (2005) Heat transfer. Higher Education Press, Beijing, China, 2005, 41–43
Vinokurov VA (1987) Welding stresses and distortion. Boston Spa, London, British, 1987, 118
Labudovic M, Hu D, Kovacevic R (2003) A three dimensional model for direct laser metal powder deposition and rapid prototyping. J Mater Sci 38(1):35–49. doi:10.1023/A:1021153513925
He B, Li DC, Zhang AF, Lu ZL, Ge JB et al (2013) Influence of oxidation on the cracks of DZ125L nickel-based superalloy thin-walled parts in laser metal direct forming. Rapid Prototyp J 19(6):446–451. doi:10.1108/RPJ-12-2011-0133
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Zhang, A., Qi, B., Shi, B. et al. Effect of curvature radius on the residual stress of thin-walled parts in laser direct forming. Int J Adv Manuf Technol 79, 81–88 (2015). https://doi.org/10.1007/s00170-014-6769-4
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DOI: https://doi.org/10.1007/s00170-014-6769-4