Simulation of Metal Surface Layer Modification by Nano-Particles upon Pulsed Induction Heating
Authors: Popov V.N., Cherepanov A.N., Shchukin V.G. | Published: 12.04.2018 |
Published in issue: #2(77)/2018 | |
DOI: 10.18698/1812-3368-2018-2-82-96 | |
Category: Physics | Chapter: Condensed Matter Physics | |
Keywords: numerical simulation, metal modification, pulsed induction heating, heat transfer, nano-size refractory particles, crystallization |
The purpose of the study was to consider the applicability of high-frequency electromagnetic field for metal heating and melting with a view to its subsequent modification. Two-dimensional numerical simulation of the processes during the modification of the substrate surface metal layer was carried out. The substrate surface was covered with a layer of specially prepared nano-size refractory particles, which become active crystallization centers after the penetration into the melt. The proposed mathematical model is used to consider the processes including heating, phase transition and heat transfer in the molten metal, the nucleation and growth of the solid phase in the presence of a modifier material in the melt. The distribution of the electromagnetic energy in the metal is described by empirical formulae. The melting of the metal is considered at the Stephan's approximation, and during solidification all nano-size particles are assumed to be centers of volume-consecutive crystallization. The flow in the liquid is described by Navier — Stokes equations in Boussinesq approximation. Distribution of nanoparticles in the melt is simulated by moving markers. According to the results of numerical experiments, the flow structure in the melt was evaluated depending upon the amount of surface-active impurities in the metal. The modes of the induction-pulse action are detected: they promote creating the flows for the homogeneous distribution of modifying particles in the melt. Findings of the research show that application of pulses of high frequency electromagnetic field for heating and melting of metals allows modifying the metal deeper in comparison with the use of a laser. Characteristics of the volume and successive crystallization are considered, as well as the growth characteristics of the solid phase. The dimensions of the two-phase zone and the zone of the metastable state are estimated when the proportion of the crystalline phase increases very slowly and is practically close to zero
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