In the laser processing environment, the metal melting process has more than 50 different factors at play, foreign countries to establish a dedicated test platform to evaluate the process measurement and control technology as a way to observe the melting and solidification process of metal powder, the integration of process measurement tools, and based on data to obtain control algorithms and development software. But what exactly happens during the laser processing of composites,. How do the reinforcing particles in the composite interact with the melt? Is there any key progress in the research of composite materials in China?
According to professionals, in the laser 3d printing process, the heat and mass transfer process between the reinforcing particles and the melt interface in the melt pool has an important impact on the movement behavior of the particles, thus affecting the uniformity of the tissue, especially the material system with different specific gravity, which may accelerate the floating and sinking of the particles in the laser process.
Moreover, the numerical simulation of heat and mass transfer at the interface between the reinforcing particles and the melt is a complex research work involving three-dimensional spatial scale and multiple physical fields. temperature gradient and more pronounced changes in the dynamic viscosity, that is, the existence of a thermal boundary layer in fluid mechanics.
In the laser 3d printing process, enhanced particles under the action of the laser, not only the surface melting, will be accompanied by elemental diffusion, will form a chemical composition gradient; in the combined effect of temperature gradient and chemical composition gradient, particles, the rheological properties of the fluid at the melt interface becomes extremely complex, so there is no engineering available in the laser processing process melt pool enhanced particles and melt interface heat and mass transfer simulation operation software.
Then how can we unveil the true nature of laser 3d printing composites? We learned the latest industry news, domestic research has made progress, the invention of laser 3d printing composite materials within the melt pool of enhanced phase and the melt interface heat and mass transfer simulation method. Including the establishment of a three-dimensional temperature field and flow field model including particles and melt composite melt pool, the physical geometry model established to establish the master control equations, based on computational fluid dynamics software for the calculation of heat and mass transfer between the particles and the melt three steps.
This method can be used not only to study the correlation of heat and mass transfer between the reinforcing phase and melt interface within the melt pool of laser 3D printed composites, but also to study the numerical simulation method of the solidification behavior of the melt pool of laser 3D printing based on active tracking in time and space, the mesoscopic simulation method of the laser beam and powder particle light-solid coupling process, etc.