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NONSTATIONARY THERMOKINETIC MODEL OF SURFACE LASER SCANNING

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Journal of Applied Mechanics and Technical Physics Aims and scope

Abstract

This paper presents a thermophysical model of laser beam scanning of the surface of a two-layer plate whose top layer melts and undergoes shrinkage due to changes in porosity and whose bottom layer (substrate) does not melt. The dependences of the heat capacity, thermal conductivity, and reflection coefficient on porosity are taken into account. Heat loss can occur by both radiation and convection. Results illustrating the non-stationarity of the process throughout the scan are presented. It is shown that the complex thermal cycles and inhomogeneous temperature field are directly related to inhomogeneous shrinkage, leading to the surface topography typical of selective laser melting processes.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, Russia

    A. G. Knyazeva

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  1. A. G. Knyazeva
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Correspondence to A. G. Knyazeva.

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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, 2021, Vol. 62, No. 6, pp. 130-137. https://doi.org/10.15372/PMTF20210615.

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Knyazeva, A.G. NONSTATIONARY THERMOKINETIC MODEL OF SURFACE LASER SCANNING. J Appl Mech Tech Phy 62, 1001–1007 (2021). https://doi.org/10.1134/S0021894421060158

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  • DOI: https://doi.org/10.1134/S0021894421060158

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