Multi-field Coupling Simulation and Experiment of Laser Cladding under Thermal Dependent Physical Properties

doi:10.3969/j.issn.1000-1093.2019.06.017

Abstract

Abstract: The thermal-elastic-plastic-flow multi-field coupling changes exist in laser cladding, which affects convection, heat, mass transfer, and solidification process. The mechanism of multi-field coupling evolution is hard to be dynamically tracked and revealed because of the small volume of molten pool, large temperature gradient and very strong instantaneous characteristics. A multi-field coupled 3D mathematical model of disk laser in the process of cladding Fe60 powder on 45 steel was established.The interaction between the powder flow and the laser energy beam, the influences of surface tension and buoyancy on the fluid flow in the melt pool, and the instantaneous change of cladding layer shape are taken into account in the proposed model. The thermal dependent physical properties of substrate and powder were obtained by using the CALPHAD phase diagram calculation method. The model was solved to obtain the distribution state and evolution law of temperature field and velocity field in the process of laser cladding. The results show that the laser cladding morphology and solidification microstructure predicted by simulation agree well with the metallographic results obtained by using Zeiss-IGMA HD field emission scanning electron microscope. Key

Key words: lasercladding, multifieldcoupling, thermaldependentphysicalproperties, disklaser

CLC Number:

TG174.442⁺.9

LI Chang, YU Zhibin, GAO Jingxiang, LI Yunfei, HAN Xing. Multi-field Coupling Simulation and Experiment of Laser Cladding under Thermal Dependent Physical Properties[J]. Acta Armamentarii, 2019, 40(6): 1258-1270.

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图15 激光熔覆中G和S对熔池凝固组织的影响
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第40卷第6期
2019 年6月兵工学报ACTA
ARMAMENTARIIVol.40No.6Jun.2019

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