Approaches to determining the limiting rate of selective laser melting of metals and alloys

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Abstract

The study provides a qualitative assessment of the maximum rate of metal powder processing, which ensures obtaining a high density product by selective laser melting. The maximum rate is determined by the characteristic time of the main physical processes for the formation of a solid material in the course of selective laser melting: heating, melting, and spreading.

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About the authors

V. N. Chuvildeev

National Research Lobachevsky State University of Nizhni Novgorod

Email: semenycheva@nifti.unn.ru
Russian Federation, Nizhny Novgorod, 603022

A. V. Semenycheva

National Research Lobachevsky State University of Nizhni Novgorod

Author for correspondence.
Email: semenycheva@nifti.unn.ru
Russian Federation, Nizhny Novgorod, 603022

S. V. Shotin

National Research Lobachevsky State University of Nizhni Novgorod

Email: semenycheva@nifti.unn.ru
Russian Federation, Nizhny Novgorod, 603022

M. Yu. Gryaznov

National Research Lobachevsky State University of Nizhni Novgorod

Email: semenycheva@nifti.unn.ru
Russian Federation, Nizhny Novgorod, 603022

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2. Fig. 1. Map in the axes “volume power density” – “layer thickness” for the PLS of the Ti6Al4V alloy. The modes are taken from [10]. Triangular markers highlight the values ​​calculated by formula (24), round markers – the values ​​calculated by formula (25), and square markers – those calculated by formula (26). The experimental values ​​of the mode parameters from [10] and the values ​​of the geometric parameters and the Nusselt number from expression (27) were substituted into the formulas. The lines represent a linear approximation of the positions of these points.

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3. Fig. 2. Map in the axes “volume power density” – “layer thickness” for the PLS of 316L steel. The modes from [56] were taken for two scanning speeds (1) – 1000 mm/s and (2) – 500 mm/s. Triangular markers highlight the values ​​calculated by formula (24), round markers – the values ​​calculated by formula (25), and square markers – those calculated by formula (26). The experimental values ​​of the mode parameters from [56] and the values ​​of the geometric parameters and the Nusselt number from expression (27) were substituted into the formulas. The lines represent a linear approximation of the positions of these points.

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