H13 tool steel powder is used as a raw material to rapidly form thin-walled structures using laser metal deposition technology. The gas/metal powder flow computational fluid dynamics (CFD) model was developed using Fluent software to analyze the forced convection heat loss parameters. The heat flow constitutive equations of the deposition process are established, the metal deposition is simulated using the life-and-death element technology, and the 3D thermo-mechanical sequential coupled finite element simulation of the laser metal deposition is performed based on the APDL language. The effects of deposition paths on the thermal distribution and residual stress field distribution of thin-walled structures were analyzed. The results show that there is a local residual tensile stress exceeding the tensile strength of the workpiece in the corners of the straight wall structure, resulting in cracks. Unlike the one-way deposition path, the zig-zag deposition path induces different symbolic residual shear stresses in the subsequent deposition layer. The temperature gradient of the one-way deposition wall is relatively low, and the residual stress is slightly lower than the zig-zag deposition wall, but the quality of the formed structures is low. The residual stress calculation results are in agreement with the experimental measurements, and can provide operation references for the deposition of specific part geometry.
ZHANG Yifu,ZHANG Hua,ZHU Zhengqiang,SU Zhanzhan
. Effect of Deposition Path on Residual Stresses of
Laser Additive Manufacturing Structures[J]. Journal of Shanghai Jiaotong University, 2019
, 53(12)
: 1488
-1494
.
DOI: 10.16183/j.cnki.jsjtu.2019.12.012
［1］MAZUMDER J, CHOI J, NAGARATHNAM K, et al. The direct metal deposition of H13 tool steel for 3-D components ［J］. JOM, 1997, 49(5): 55-60.
［2］HOFMEISTER W, GRIFFITH M. Solidification in direct metal deposition by LENS processing ［J］. JOM, 2001, 53(9): 30-34.
［3］READY J F, FARSON D F. LIA handbook of laser material processing［M］. USA: Laser Institute of America Magnolia Publishing, Inc, 2001.
［4］BRANDL E, PALM F, MICHAILOV V, et al. Mechanical properties of additive manufactured titanium (Ti-6Al-4V) blocks deposited by a solid-state laser and wire［J］. Materials & Design, 2011, 32(10): 4665-4675.
［5］VASINONTA A, BEUTH J L, GRIFFITH M. Process maps for predicting residual stress and melt pool size in the laser-based fabrication of thin-walled structures［J］. Journal of Manufacturing Science and Engineering, 2007, 129(1): 101-109.
［6］FU C H, GUO Y B. Three-dimensional temperature gradient mechanism in selective laser melting of Ti-6Al-4V ［J］. Journal of Manufacturing Science & Engineering, 2014, 136(6): 061004.
［7］CHENG B, SHRESTHA S, CHOU K. Stress and deformation evaluations of scanning strategy effect in selective laser melting ［J］. Additive Manufacturing, 2016, 12: 240-251.
［8］SCHOINOCHORITIS B, CHANTZIS D, SALONITIS K. Simulation of metallic powder bed additive manufacturing processes with the finite element me-thod: A critical review［J］. Proceedings of the Institution of Mechanical Engineers. Part B: Journal of Engineering Manufacture, 2017, 231(1): 96-117.
［9］RANGASWAMY P, HOLDEN T M, ROGGE R B, et al. Residual stresses in components formed by the laserengineered net shaping (LENS) process ［J］. The Journal of Strain Analysis for Engineering Design, 2003, 38(6): 519-527.
［10］LUO Z B, ZHAO Y Y. A survey of finite element analysis of temperature and thermal stress fields in powder bed fusion Additive Manufacturing ［J］. Additive Manufacturing, 2018, 21: 318-332.
［11］STEEN W M, MAZUMDER J. Laser material processing ［M］. 4th ed. Berlin: Springer Science & Business Media, 2010.
［12］Bohler-Uddeholm Corp. Bohler-Uddeholm H13 tool steel ［DB/OL］. (2013-01-07)［2018-4-20］. http://www.bucorp.com/bu_h13 _h.htm.
［13］International Mold Steel, Inc. Plastic mold steels DH2F ［DB/OL］. ［2018-4-20］. http://www.imsteel.com/plastic_mold_ steels/dh2f/dh2f_home.htm.
［14］BROOKS J, ROBINO C, HEADLEY T, et al. Microstructure and property optimization of LENS deposited H13 tool steel［C］//Proceedings of the Solid Freeform Fabrication Symposium. Austin: The University of Texas at Austin, 1999: 375-382.
［15］VAKILI-TAHAMI F, ZIAEI-ASL A. Numerical and experimental investigation of T-shape fillet wel-ding of AISI 304 stainless steel plates ［J］. Materials & Design, 2013, 47(9): 615-623.
［16］PRATT P, FELICELLI S D, WANG L, et al. Residual stress measurement of laser-engineered net shaping AISI 410 thin plates using neutron diffraction［J］. Metallurgical and Materials Transactions A, 2008, 39(13): 3155-3163.
