Numerical Simulation of Thermal Conductivity of Stainless Steel and Al-12Si Powders for Additive Manufacturing

Author:

Ankudinov Vladimir1,Gordeev Georgii A.2,Kharanzhevskiy Evgeniy V.2,Krivilyov Mikhail D.3

Affiliation:

1. Institute of Mathematics, Information Technologies and Physics, Udmurt State University, Izhevsk 426034, Russia; Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Moscow (Troitsk) 108840, Russia

2. Institute of Mathematics, Information Technologies and Physics, Udmurt State University, Izhevsk 426034, Russia

3. Institute of Mathematics, Information Technologies and Physics, Udmurt State University, Izhevsk 426034, Russia; Udmurt Federal Research Center Ural Branch of the Russian Academy of Science, Izhevsk 426067, Russia

Abstract

Abstract A three-dimensional model of a partially melted powder bed with particles stochastically distributed in size and space coordinates has been developed. Numerical simulation of temperature distributions in stainless steel AISI 316 L and Al-12Si powders in vacuum, air, and argon has been performed to analyze unsteady heat transfer in a porous medium. The numerical model demonstrates a large effect of heat transfer through the gas phase in case of powders with low thermal conductivities like stainless steels. At the porosity level of 65% and above, the mechanism of heat transfer drastically changes and a linear dependence of thermal conductivity on porosity frequently used in literature becomes incorrect. The effects of the consolidation coefficient and size distribution on effective heat transfer in powders are discussed. The obtained dependencies of the effective thermal conductivity on porosity and the consolidation coefficient could be used in additive manufacturing applications.

Funder

Russian Science Foundation

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference62 articles.

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