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Numerical simulation of transport phenomena, formation the bead and thermal behavior in application to industrial DMD technology

机译:应用于工业DMD技术的传输现象,形成珠粒和热行为的数值模拟

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摘要

The paper presents the results of theoretical and experimental investigations of the laser cladding with TRUMPF DMD 505, which enables to implement the industrial-level coating technology. The physical-mathematical model is proposed to describe and numerically simulate the processes; the model combine powder transportation and heating and formation of bed-like cladding in the conjugate statement. Special attention is paid on the simulation of gas dynamics of a triple coaxial nozzle, peculiarities of gas-disperse jet formation and optimal powder supply into the melt pool. Thermal processes in the bead and substrate are considered on the base of the conductive heat transfer with movable boundaries, phase changes, and condition of kinematic consistency of clad surface points (melt thermal convection is beyond our consideration). The influence of the governing cladding parameters on the linear sizes of individual beds from Stellite 6 alloy on a steel substrate is studied. Comparison of calculated bead profiles and full-scale experiment data showed good qualitative and quantitative agreement. The proposed model is self-consistent and can be applied to optimize the regime parameters of the laser cladding of materials.
机译:本文介绍了使用TRUMPF DMD 505进行激光熔覆的理论和实验研究结果,该技术可实现工业级涂层技术。提出了物理数学模型对过程进行描述和数值模拟。该模型结合了粉末的输送和加热,并在共轭状态下形成了床状覆层。特别注意三重同轴喷嘴的气体动力学模拟,气体分散射流形成的特性以及向熔池中最佳粉末供应的特性。在具有可移动边界,相变和包层表面点运动学一致性条件的传导性传热的基础上,考虑珠子和基材中的热过程(熔融热对流不在我们的考虑范围内)。研究了控制包层参数对钢基底上Stellite 6合金单个床的线性尺寸的影响。算出的珠子轮廓和全尺寸实验数据的比较显示出良好的定性和定量一致性。所提出的模型是自洽的,可用于优化材料激光熔覆的状态参数。

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