title: ÐÐ¸ÑÑÑÐ·Ð¸Ñ Ð°Ð·Ð¾ÑÐ° Ð¿ÑÐ¸ Ð»Ð°Ð·ÐµÑÐ½Ð¾Ð¹ Ð¸ Ð¿Ð»Ð°Ð·Ð¼ÐµÐ½Ð½Ð¾Ð¹ ÑÐµÐ·ÐºÐµ Ð½Ð¸Ð·ÐºÐ¾ÑÐ³Ð»ÐµÑÐ¾Ð´Ð¸ÑÑÐ¾Ð¹ ÑÑÐ°Ð»Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Nitrogen diffusion in laser and plasma cutting of mild steel
Creators: name: ÐÐ»ÐµÐ¹Ð½Ð¸ÐºÐ¾Ð², ÐÑÐ¸Ð³Ð¾ÑÐ¸Ð¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐÐ°Ð·ÐµÑÐ½Ð°Ñ ÑÐµÐ·ÐºÐ°
ÐÐ»Ð°Ð·Ð¼ÐµÐ½Ð½Ð°Ñ ÑÐµÐ·ÐºÐ°
ÐÐ·Ð¾Ñ
Ð¡ÑÐ°Ð»Ñ Ð¼Ð°Ð»Ð¾ÑÐ³Ð»ÐµÑÐ¾Ð´Ð¸ÑÑÐ°Ñ
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description: Theme of qualification work: Â«Nitrogen diffusion in laser and plasma cutting of mild steelÂ». In this work, the modeling of nitrogen diffusion in the process of plasma and laser cutting of low-carbon steel is carried out. Tasks of the final qualifying work: â¯ Literature analysis on the topics of plasma and laser cutting; â¯ Literature analysis on the topic of the influence of nitrogen on the structure and properties of steels; â¯ Simulation of nitrogen diffusion during plasma and laser cutting of low-carbon steel in the MATLAB software package; â¯ Analysis of the obtained results. The first chapter of the work presents a literature review on the relevance and popularity of laser and plasma cutting methods in various industries, as well as a literature review in the field of modern research of these cutting processes. The second chapter is devoted to the literature analysis of the influence of nitrogen on the structure and properties of the final steel product after welding, as well as the literature analysis of the solubility of nitrogen in steel. In addition, in the second chapter, an example of a thermodynamic model of nitrogen dissolution in a welded metal is considered. In the third chapter of the work, the modeling of nitrogen diffusion during the process of laser and plasma cutting of mild steel is carried out. The calculation is based on an analytical equation for solving the problem of diffusion of an element from a layer of finite width of an unrestricted sample under isothermal conditions. To solve the problem the nitrogen concentrations in the base metal and in the molten metal during the cutting processes were established using the literature data. The value of the temperature dependence of the nitrogen diffusion coefficient in steel was obtained from the literature data. A model of a fast-moving uniformly distributed flat heat source of finite width in a plate was used in order to calculate the temperature field during cutting. In this model it was assumed that the distribution of energy from the heat source is uniform over the entire diameter of the heating spot due to the extremely high concentration of heat input for the types of cutting used. Material of any thickness in the cutting process must be cut through, therefore, in the design scheme, an infinite plate is used as a model of the material being cut, in which the heat flow will be flat and the temperature field is two-dimensional, since the distribution of the temperature field along the sheet thickness practically does not change in any way during the cutting process. The temperature was calculated in given coordinates in the plate at given points in time using the model described above. According to the calculations, the width of the melt pool was determined for both types of the cutting processes. The temperature cycle was plotted in the coordinate of the maximum width of the melt pool, then the field of nitrogen concentration was calculated using the analytical equation, taking into account the dependence of the diffusion coefficient on temperature. The final product of the calculations was the graphs of the nitrogen concentration versus the distance to the cut axis during laser and plasma cutting of mild steel in a 5 mm thick plate on one side of the cut axis, in accordance with considerations of symmetry of the results for the other side.