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Method for simulating heat and mass transfer of reinforcement phase and melt interface in laser 3D printing composite material molten pool

A technology of 3D printing and composite materials, which is applied in the field of heat and mass transfer between enhanced phase and melt interface in laser processing molten pool

Active Publication Date: 2016-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, there is no engineering-available simulation operation software for enhancing the heat and mass transfer at the interface between particles and melt in the molten pool during laser processing

Method used

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  • Method for simulating heat and mass transfer of reinforcement phase and melt interface in laser 3D printing composite material molten pool
  • Method for simulating heat and mass transfer of reinforcement phase and melt interface in laser 3D printing composite material molten pool
  • Method for simulating heat and mass transfer of reinforcement phase and melt interface in laser 3D printing composite material molten pool

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0049] Establish a three-dimensional temperature field and flow field model including particles and melt composite melt pool

[0050]Establish the computational geometry model of the part in Gambit software, and mesh the computational geometric model of the part: first divide the computational geometric model of the part into regular areas and irregular areas, where the regular area is divided into hexahedral meshes, and the irregular area Tetrahedral grids are used for division; the grid density is increased around the particles, and the grids are thinned in areas far away from the particles. When the calculation results do not change with the increase of grid precision, it shows that the calculation accuracy and efficiency of the model have reached rationalization ;

[0051] Step 2: Establish the master governing equation for the physical geometry model established...

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Abstract

The invention relates to a method for simulating heat and mass transfer of a reinforcement phase and a melt interface in a laser 3D printing composite material molten pool, and aims at the temperature fields and velocity fields in the neighborhood of reinforced particles in the molten pool as well as distribution condition of the particles in samples after the final solidification. The method comprises the following steps: establishing a physical model of heat and mass transfer between the reinforced particles and melts; controlling the heat and mass transfer through a master control equation; and solving a control equation on the basis of calculation fluid dynamics software so as to obtain the temperature fields, the velocity fields and the distribution condition of the reinforced particles. According to the method for simulating the heat and mass transfer of the reinforced particles and the melt interface in the laser processing molten pool, a flow field model for disturbing the interior of the molten pool via laser and influencing the heat and mass transfer process between the reinforced particles and the melts is established aiming at a process of processing and preparing metal-matrix composite materials (MMCs) via laser, and the problems of powder, phase change and solidification in the laser processing process are considered, so that physical metallurgical behaviors of the reinforced particles and matrixes are correctly obtained, and the calculation results are favorably identical with experiments.

Description

technical field [0001] The invention relates to a method for simulating heat and mass transfer between a reinforcement phase and a melt interface in a laser processing molten pool, in particular to the reinforcement particles in the molten pool being disturbed by the molten pool melt and their final distribution form. Background technique [0002] During laser processing, the enhanced heat and mass transfer process between the particles and the melt interface in the molten pool has an important impact on the movement behavior of the particles, thereby affecting the uniformity of the structure; especially for material systems with large specific gravity, the non-equilibrium melting caused by laser The pool will accelerate the floating or sinking of particles; at the same time, the enhanced particle distribution is also closely related to the flow of the melt and the liquid-solid front. [0003] Numerical simulation of enhanced heat and mass transfer at the particle-melt inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 顾冬冬戴冬华袁鹏鹏余冠群
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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