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首页> 外文期刊>International Journal of Heat and Mass Transfer >Multivortex convection of metal in molten pool with dispersed impurity induced by laser radiation
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Multivortex convection of metal in molten pool with dispersed impurity induced by laser radiation

机译：熔池中金属与激光辐射引起的分散杂质的多旋流对流

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摘要

Results of the numerical solution of an adjoint problem of thermocapillary microconvection induced by laser radiation in a molten pool on a metal substrate are presented. Problems of modeling various processes of laser-induced surface modification of materials(laser-induced hardening, alloying and cladding)are discussed. Distributions of temperature, velocity, and streamlines in the liquid dimple are presented, which demonstrate specific features of existence of three-dimensional multivortex flows responsible for thermohydrodynamics of the melt, formation of the bottom relief of the liquid dimple, and mixing of refractory alloying disperse components. Alloying additives are inserted into the molten pool by means of gas-jet transportation through a coaxial nozzle or by preliminary(before laser beam passage)application of these additives onto the surface of the processed material. A physicomathematical model for calculating the convection of the fine-grain impurity is proposed, and the calculated dynamics of tungsten and titanium carbide particles in a molten pool on a steel substrate is described. Distributions of their number concentrations in the melted zone after crystallization are obtained.
机译：提出了由激光辐射在金属基板上的熔池中引起的热毛细微对流伴随问题的数值解的结果。讨论了对材料进行激光诱导的表面改性的各种过程（激光诱导的硬化，合金化和熔覆）进行建模的问题。给出了液体酒窝中的温度，速度和流线的分布，它们表明了三维多涡流的存在的特定特征，该三维多漩涡流负责熔体的热流体动力学，液体酒窝的底部浮雕的形成以及难熔合金分散体的混合组件。合金添加剂通过同轴喷嘴的气体喷射输送或通过将这些添加剂初步（在激光束通过之前）施加到加工材料的表面上而插入到熔池中。提出了一种用于计算细颗粒杂质对流的物理数学模型，并描述了钢基底上熔池中钨和碳化钛颗粒的计算动力学。获得它们在结晶后在熔融区中的数浓度分布。

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  • 来源
  • 作者

    O.B. Kovalev; A.M. Gurin;

  • 作者单位

    Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of Russian Academy of Sciences, Institutskaya Str., 4/1, Novosibirsk 630090, Russia;

    Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of Russian Academy of Sciences, Institutskaya Str., 4/1, Novosibirsk 630090, Russia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermocapillary convection; Surface modification; Laser;

    机译：热毛细管对流;表面改性;激光;

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