Interaction of laser radiation with the material during production powders and fibers
The effect of laser radiation on a solid body leads to a change in the temperature field of the processed substance. The nature of heating, which is determined by the rate of change in temperature and temperature gradients, is different depending on the properties of the processed material and proce...
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Belarusian National Technical University
2021-03-01
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| Series: | Литьë и металлургия |
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| Online Access: | https://lim.bntu.by/jour/article/view/3308 |
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| author | Y. D. Chernichenko M. N. Vereschagin S. N. Tselueva M. Yu. Tseluev |
| author_facet | Y. D. Chernichenko M. N. Vereschagin S. N. Tselueva M. Yu. Tseluev |
| author_sort | Y. D. Chernichenko |
| collection | DOAJ |
| description | The effect of laser radiation on a solid body leads to a change in the temperature field of the processed substance. The nature of heating, which is determined by the rate of change in temperature and temperature gradients, is different depending on the properties of the processed material and processing conditions.The main physical parameters of the process of laser processing of solids are the specific power of the absorbed laser stream 104–109 W/cm2 and the interaction time of the metal with the beam – 10–5–10–8 s. When such radiation pulses interact with the surface, an instantaneous explosive melting of a part of the material occurs and the substance surrounding the surface is transferred to the plasma state. The subsequent expansion of the plasma is accompanied by the appearance of a shock wave with a peak pressure of 1–10 GPa, which acts on the material, and the metal is dispersed.The mathematical problem of heating and melting a cylindrical plate with a laser light flux that normally affects its surface is solved. this problem is described by a system of thermal conductivity equations in three sections of the heated plate, which are characterized by the time factor of the laser radiation effect on the substance 1) 0 ≤ t ≤ tm; 2) t > tm; 3) tm < t ≤ th (here tm, th is the time moment corresponding to the beginning of the formation of the liquid phase and the end of the melting of the plate, respectively).The calculated dependences of changes in the surface temperature of metal alloys X18N10T, X15N60 during the action of a laser radiation pulse with a duration of τ=5 ms are presented. The presence of a phase transition associated with metal melting (an inflection in the curves) leads to a temporary decrease in the rate of temperature growth. The distribution of temperature fields causes a significant heterogeneity in the distribution of temperature over the thickness of materials, which reaches 2000 °C or more depending on the thickness of the metal and the conditions of exposure. The temperature curves of the surface heating repeat the shape of the pulse, and the temperature of the rest of the metal has a nonlinear tendency to increase with the output to the asymptote.It is established that the process of explosive metal sputtering requires heating the volume of the material above the melting point at a thickness of 300–350 microns and an impact energy of 7–8 J. Reducing the level of energy impact to 5–6 J and increasing the thickness of the workpiece more than 500 microns does not provide the distribution of temperature fields required for the implementation of the spraying process. |
| format | Article |
| id | doaj-art-8208f186b7c14cf19c3bc2fd0de026f6 |
| institution | Kabale University |
| issn | 1683-6065 2414-0406 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Литьë и металлургия |
| spelling | doaj-art-8208f186b7c14cf19c3bc2fd0de026f62025-08-20T03:37:50ZengBelarusian National Technical UniversityЛитьë и металлургия1683-60652414-04062021-03-010111412310.21122/1683-6065-2021-1-114-1233198Interaction of laser radiation with the material during production powders and fibersY. D. Chernichenko0M. N. Vereschagin1S. N. Tselueva2M. Yu. Tseluev3P.O.Sukhoi State Technical University of GomelP.O.Sukhoi State Technical University of GomelP.O.Sukhoi State Technical University of GomelV. A. Belyi Metal-polymer Research Institute of National Academy of Sciences of BelarusThe effect of laser radiation on a solid body leads to a change in the temperature field of the processed substance. The nature of heating, which is determined by the rate of change in temperature and temperature gradients, is different depending on the properties of the processed material and processing conditions.The main physical parameters of the process of laser processing of solids are the specific power of the absorbed laser stream 104–109 W/cm2 and the interaction time of the metal with the beam – 10–5–10–8 s. When such radiation pulses interact with the surface, an instantaneous explosive melting of a part of the material occurs and the substance surrounding the surface is transferred to the plasma state. The subsequent expansion of the plasma is accompanied by the appearance of a shock wave with a peak pressure of 1–10 GPa, which acts on the material, and the metal is dispersed.The mathematical problem of heating and melting a cylindrical plate with a laser light flux that normally affects its surface is solved. this problem is described by a system of thermal conductivity equations in three sections of the heated plate, which are characterized by the time factor of the laser radiation effect on the substance 1) 0 ≤ t ≤ tm; 2) t > tm; 3) tm < t ≤ th (here tm, th is the time moment corresponding to the beginning of the formation of the liquid phase and the end of the melting of the plate, respectively).The calculated dependences of changes in the surface temperature of metal alloys X18N10T, X15N60 during the action of a laser radiation pulse with a duration of τ=5 ms are presented. The presence of a phase transition associated with metal melting (an inflection in the curves) leads to a temporary decrease in the rate of temperature growth. The distribution of temperature fields causes a significant heterogeneity in the distribution of temperature over the thickness of materials, which reaches 2000 °C or more depending on the thickness of the metal and the conditions of exposure. The temperature curves of the surface heating repeat the shape of the pulse, and the temperature of the rest of the metal has a nonlinear tendency to increase with the output to the asymptote.It is established that the process of explosive metal sputtering requires heating the volume of the material above the melting point at a thickness of 300–350 microns and an impact energy of 7–8 J. Reducing the level of energy impact to 5–6 J and increasing the thickness of the workpiece more than 500 microns does not provide the distribution of temperature fields required for the implementation of the spraying process.https://lim.bntu.by/jour/article/view/3308laser radiationlaser surface treatmenttemperature fieldthermal conductivity equationboundary conditionslaser radiation pulsespecific power densitymelting pointlaplace integral transformhankel integral transform |
| spellingShingle | Y. D. Chernichenko M. N. Vereschagin S. N. Tselueva M. Yu. Tseluev Interaction of laser radiation with the material during production powders and fibers Литьë и металлургия laser radiation laser surface treatment temperature field thermal conductivity equation boundary conditions laser radiation pulse specific power density melting point laplace integral transform hankel integral transform |
| title | Interaction of laser radiation with the material during production powders and fibers |
| title_full | Interaction of laser radiation with the material during production powders and fibers |
| title_fullStr | Interaction of laser radiation with the material during production powders and fibers |
| title_full_unstemmed | Interaction of laser radiation with the material during production powders and fibers |
| title_short | Interaction of laser radiation with the material during production powders and fibers |
| title_sort | interaction of laser radiation with the material during production powders and fibers |
| topic | laser radiation laser surface treatment temperature field thermal conductivity equation boundary conditions laser radiation pulse specific power density melting point laplace integral transform hankel integral transform |
| url | https://lim.bntu.by/jour/article/view/3308 |
| work_keys_str_mv | AT ydchernichenko interactionoflaserradiationwiththematerialduringproductionpowdersandfibers AT mnvereschagin interactionoflaserradiationwiththematerialduringproductionpowdersandfibers AT sntselueva interactionoflaserradiationwiththematerialduringproductionpowdersandfibers AT myutseluev interactionoflaserradiationwiththematerialduringproductionpowdersandfibers |