Device and method for follow-up ultrasonic-assisted direct laser deposition of ceramic reinforced metal matrix composite material

Abstract

The invention provides a device and a method for follow-up ultrasonic-assisted direct laser deposition of a ceramic reinforced metal matrix composite material, and belongs to the technical field of additive manufacturing. The method comprises the step of adopting a positioning clamping device to keep an ultrasonic impact gun following a coaxial powder feeding nozzle. In the process of direct laserdeposition of the ceramic reinforced metal matrix composite material, ultrasonic cavitation, acoustic streaming, mechanical and thermal effects are utilized to intervene the solidification behavior of a molten pool in real time, and the localized impact strengthening effect of ultrasonic impact is used to control the stress in real time. Compared with the forming method of direct laser deposition, the method can effectively reduce pores inside a sample, and ensure the consistency of the solidified structure and the uniformity of the stress distribution. At the same time, the method has a highutilization rate of ultrasonic energy, and can realize ultrasonic intervention in the forming process of large components.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a device and method for direct laser deposition of ceramic-reinforced metal matrix composites assisted by ultrasonic waves. Background technique [0002] Direct laser deposition technology combines digital manufacturing technology and laser technology. By using high energy density laser heat source, it directly melts high melting point ceramic and metal powder, and realizes rapid prototyping of parts through in-situ deposition of molten powder. Compared with traditional manufacturing technology, direct laser deposition technology has the advantages of high material utilization rate, wide range of applicable materials, and strong system flexibility. It has been widely used in aerospace, nuclear power equipment, biomedical and other fields. However, related studies have shown that due to the uneven microstructure distribution caused by the unsteady solidi...

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Problems solved by technology

[0006] In order to solve the problems of inconsistent tissue distribution and uneven stress distribution in the process of direct laser deposition of ceramic-reinforced metal-matrix composites, the present invention provides a device and method for direct laser-assisted deposition of ceramic-reinforced metal-matrix The clamping device keeps the ultrasonic impact gun and the coaxial powder feeding nozzle in motion. In the process of laser direct deposition of ceramic reinforced metal matrix composites, the ultrasonic effect is used to intervene in the solidification behavior of the molten pool in real time, and the ultrasonic impact is used to respond to the stress in real time. Control to promote grain refinement, ensure the consistency of tissue distribution and the uniformity of stress distribution

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