Development of laser alloying techniques and coaxial head for their implementation
DOI:
https://doi.org/10.15587/1729-4061.2013.18154Keywords:
laser, alloying, steel, powder mixture, modeling, coaxial head, development, testingAbstract
The paper studies the process of laser alloying of structural steel by various mixtures of powder materials, and describes the development and testing of a new design of technological head for implementing this process with coaxial, with respect to the focused laser radiation, introduction of filler powder materials. Using mathematical modeling of a powder mixture motion in the nozzle with a coaxial introduction of laser radiation it has been shown that under such introduction of powder increased pressure of carrier gas in the peripheral stream with respect to the central stream positively affects the ordering of powder particles motion. Based on the calculation results a head for laser alloying has been designed. It has been found that under processing of cylindrical samples along the helical or spiral line the depth of the layer obtained is directly proportional to the coefficient of alloying paths overlap. When decreasing this coefficient from 0,7 to 0,2 the depth of alloyed layer is increased by 60%. Softening (hardness reduction) takes place in the upper part of paths. This phenomenon is concerned with the overheating of near-surface layers, but it is not a drawback, since the softened layer is removed during the final machining.
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Copyright (c) 2014 Володимир Дмитрович Шелягін, Владислав Юрійович Хаскін, Іван Володимирович Шуба, Артемій Володимирович Бернацький, Любов Тимофіївна Єремєєва, Ольга Вікторівна Федосєєва
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