Selective laser melting of AlSi10Mg powders with different granulometric composition


Аuthors

Nguyen T. L.1*, Dobryansky V. N.2**, Rabinskiy L. N.2***

1. Le Quy Don Technical University, 236 Hoang Quoc Viet, Ha Noi, Viet Nam
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: kqvn.nguyenlong@gmail.com
**e-mail: dobryanskijvn@mai.ru
***e-mail: rabinskiy@mail.ru

Abstract

This paper presents the results of a study on how the particle size distribution of AlSi10Mg alloy powders affects the laser powder bed fusion process and its thermomechanics. The influence of the median particle size on melt-pool morphology and structural defect formation was demonstrated in single-track  experiments. The research was conducted on powders with a particle size d50 ranging from 20 to 70 µm, obtained by sieving a standard powder, across a wide range of laser scanning speeds (0.1-1.98 m/s) and laser powers (40-400 W). The effects of powder granulometry on melt-pool depth and width, the onset of deep penetration (keyhole) melting, balling and unstable melting regimes, as well as the formation of defects in the form of cracks, were analyzed. Based on the results from top-view and cross-sectional analysis of the single tracks, processing maps were constructed, reflecting the characteristic parameter ranges corresponding to different types of single-track morphology. Analysis of the initial melting of the powder bed with different granulometries established the dependence of the energy required for melting on the average particle size of the powder layer and solved the inverse problem of identifying the effective absorption coefficients and thermal conductivity of the powder bed.

Keywords:

laser powder bed fusion, granulometric composition, melting parameters, single track, melt pool, cracks

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