In laser cladding, the interaction of laser radiation with the powder flow and the substrate plays a key role. Surface heating depends on the distribution of radiation on the surface of the material, which is determined by the interaction of radiation with the flow of the powder microparticles. Usually, in models for calculating laser beam attenuation, the interaction of radiation with microparticles is limited to a simple geometric consideration based on the ratio of the cross-section area of the particles to the total area of the cross section under consideration, without taking into account the influence of diffraction. Radiation propagation is also considered in epy geometric approximation. The presented model allows taking into account the phenomenon of diffraction on powder microparticles. The results obtained using the model with radiation propagation in the geometric approximation are compared with the model with radiation propagation in the diffraction approximation proposed by the authors. It is shown that the numerical model of radiation attenuation and propagation in the diffraction approximation is applicable for complex analysis of the interaction between a laser beam, a particle stream, and a surface. The model allows estimating the beam attenuation due to interaction with the flow of microparticles and obtaining the intensity distribution on the surface of the substrate.

在激光熔覆中，激光辐射与粉末流和基材的相互作用起着关键作用。表面加热取决于辐射在材料表面的分布，该分布由辐射与粉末微粒流的相互作用确定。通常，在用于计算激光束衰减的模型中，辐射与微粒的相互作用基于微粒的横截面面积与所考虑的横截面的总面积之比而限于简单的几何考虑，而无需考虑考虑到衍射的影响。在epy几何近似中也考虑了辐射传播。提出的模型允许考虑粉末微粒上的衍射现象。作者将几何近似的辐射传播模型与衍射近似的辐射传播模型进行了比较。结果表明，在衍射近似中辐射衰减和传播的数值模型适用于激光束，粒子流和表面之间相互作用的复杂分析。该模型允许估计由于与微粒流的相互作用而引起的光束衰减，并获得基板表面上的强度分布。结果表明，在衍射近似中辐射衰减和传播的数值模型适用于激光束，粒子流和表面之间相互作用的复杂分析。该模型允许估计由于与微粒流的相互作用而引起的光束衰减，并获得基板表面上的强度分布。结果表明，在衍射近似中辐射衰减和传播的数值模型适用于激光束，粒子流和表面之间相互作用的复杂分析。该模型允许估计由于与微粒流的相互作用而引起的光束衰减，并获得基板表面上的强度分布。