基于相场法的超声振动对激光熔覆多晶凝固行为的影响

doi:10.11896/cldb.20040250

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Abstract Laser cladding is an emerging surface strengthening technology, which has the characteristics of high process accuracy, good controllability, fine structure, and small thermal distortion. It is widely used in the fields of automobiles, energy, electronics, aerospace and other fields. The micro-cracks, pores and other micro-defects that appeared in the laser cladding process seriously affected the promotion of this technology. Ultrasonic vibration uses high-frequency and low-amplitude vibration, which can affect the cladding and solidification microstructure and effectively reduce microscopic defects. Based on the phase field method, a dynamic model of the laser cladding bath solidification process of a disc laser under ultrasonic vibration was established, and the model was solved by programming, revealing the polycrystalline solidification structure under different amplitudes, and at the same time, the cladding solidification behavior was experimentally characterized. The two conclusions are in good agreement. Studies have shown that ultrasonic vibration can effectively refine the structure of the cladding layer, promote crystal solidification and nucleation, and change the preferred orientation of dendrites. Vibration does not affect the growth rate of the main dendrite arm, but has obvious effects on the width of the main dendrite arm, the formation of the secondary dendrite arm, the growth rate and the competitive growth. With the increase of ultrasonic amplitude, the secondary and tertiary dendrite arms tend to flourish, and the competitive growth is obvious, which indirectly reduces the formation of pores and cracks in the solidified structure. Excessive ultrasonic amplitude will not further change the dendrite morphology. This research provides theoretical guidance for the practical application of laser cladding under ultrasonic vibration, and provides an important theoretical basis for precise control of the solidification structure.

Key words： ultrasonic vibration laser cladding phase field method disk laser solidification mechanism

Published: 01 July 2021

CLC number:

TG111.4

Fund:This work was finacially suported by the National Natural Science Foundation of China (E050402/51374127), Public Affairs Key Laboratory of the Armed Police Fire Department of the Ministry of Public Security (KF201704), Natural Science Foundation Guidance Project of Liaoning (2019ZD0277), Innovation Team Construction Project of University of Science and Technology Liaoning (601009830).

About author:: Jingxiang Gao, M.S. from University of Science and Technology Liaoning. Mainly engaged in laser manufacturing and other surface technologies, micro-nano material calculation methods and other research. Published 11 articles in important journals at home and abroad, of which 8 were indexed by SCI/EI and 3 invention patents were declared.
Chang Li, professor, School of Mechanical Enginee-ring and Automation, Liaoning University of Science and Technology, master instructor. Graduated from the School of Mechanical Engineering and Automation of Northeastern University with a Ph. D, in mechanical design and theory in January 2009. Mainly engaged in mechanical reliability engineering, service damage mechanism and reliability test method of high speed and heavy load gear transmission system/aviation bearing, laser cladding and laser surface treatment, welding reliability, supersonic spraying and other advanced metal surface manufacturing technology research. He was selected as a thousand-level candidate in Liaoning Province's “One Hundred Million Talents Project”, and was selected into the Liaoning Higher Education Outstanding Talent Support Program, selected into the Innovative Talents Program of colleges and universities in Liaoning Province. Published 71 articles in important journals at home and abroad, of which 50 were searched by SCI/EI, 8 invention patents were approved, 16 utility model patents, 2 software copyrights, and 1 academic monograph were published.

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Cite this article:

GAO Jingxiang,LI Chang,CHEN Zhengwei, et al. Effect of Ultrasonic Vibration on the Solidification Behavior of Laser Cladding Polycrystalline Based on Phase Field Method[J]. Materials Reports, 2021, 35(12): 12161-12168.

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http://www.mater-rep.com/EN/10.11896/cldb.20040250 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12161

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