Progress in the Effect of Ultrasonic Impact Treatment on Microstructure Improvement and Strengthening Mechanism in Additive Manufacturing
SUN Laibo1,2, HUANG Lujun2, HUANG Ruisheng1(), XU Kai1, WU Pengbo1, LONG Weimin3, JIANG Fengchun4, FANG Naiwen1
1Harbin Welding Institute Limited Company, China Academy of Machinery Science and Tecchnology Group, Harbin 150028, China 2School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 3State Key Laboratory of New Brazing Materials and Technology, Zhengzhou Research Institute of Mechanical Engineering Co. Ltd., Zhengzhou 450001, China 4Yantai Research Institute of Harbin Engineering University, Yantai 264000, China
Cite this article:
SUN Laibo, HUANG Lujun, HUANG Ruisheng, XU Kai, WU Pengbo, LONG Weimin, JIANG Fengchun, FANG Naiwen. Progress in the Effect of Ultrasonic Impact Treatment on Microstructure Improvement and Strengthening Mechanism in Additive Manufacturing. Acta Metall Sin, 2024, 60(3): 273-286.
Additive manufacturing (AM) is a rapidly developing technology that has found widespread use in the manufacturing industry. However, the application with high performance and stability requirements is constrained by its coarse microstructure, which exhibits obvious directionality during the deposition of metal parts. Ultrasonic impact treatment (UIT) has been recognized as an effective strengthening method that can improve the stress state, refine the microstructure, and enhance the overall performance of metal parts fabricated via AM. This paper summarizes the theoretical views and limitations of UIT strengthening regarding surface plastic deformation. Additionally, it elaborates on the mechanism of microstructure refinement and the transformation of columnar dendrites to equiaxed dendrites, influenced by the combined effect of UIT and AM. Finally, the paper outlines the problems and suggestions related to strengthening theory that require further investigation in the process of UIT-assisted AM.
Fund: National Key Research and Development Program of China(2021YFB3401100);Heilongjiang Head Goose Action Plan-Advanced Welding Technology Innovation Team of Energy Equipment(201916120);Program of Open Project of the State Key Laboratory of New Brazing Materials and Technology(SKLABFMT202005);High-End Talent Program of China Academy of Machinery Science and Technology Group(202210109)
Corresponding Authors:
HUANG Ruisheng, professor, Tel: 13936168723, E-mail: huangrs8@163.com
Fig.1 Schematics of the working principle[36] (a) and energy conversion[37] (b) of ultrasonic impact treatment (UIT)
Fig.2 SMA490BW steel microstructural evolutions and schematics influenced by UIT[41] (a) microstructure without treatment (b) dislocation multiplication (c) formation of dislocation cells (d) formation of subgrains (e) microstructure refinement
Fig.3 OM images (a) and the grain morphologies drawn from Fig.3a (b), schematics of the strengthening mechanism of UIT-aided additive manufacturing (AM) based on surface plastic deformation (c-e) in Ti-6Al-4V alloy[50]
Fig.4 EBSD inverse pole figure (IPF) maps for Inconel 718 alloy under various conditions (LMD—laser metal deposition)[56] (a) LMD-only as-built (b) LMD + UIP as-built (c) LMD-only solution treated (d) LMD + UIP solution treated
Fig.5 Interlayer microstructures of LMD-only (a) and LMD + UIT (b) cases at as-built condition in Inconel 718 alloy, with left column showing IPF maps, middle column showing kernel average misorientation (KAM) distributions, right column showing the distributions of recrystallization twin boundaries and sub-grain boundaries[66]
Fig.6 Effects of solution treatment (ST) on the microstructure of Inconel 718 alloy, with the left column representing the 1020oC ST condition, center column representing 1100oC condition, and right column representing 1180oC condition[66] (a) LMD-only (b) LMD + UIT
Fig.7 Grain boundary distribution comparisons of typical areas of depositions without (a) and with (b) UIT in low carbon steel[76]
Fig.8 Schematics of microstructure evolution during UIT strengthening AM[76] (a) before UIT (b) dislocation merging and annihilating(c) subgrains formation (d) microstructure refinement
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