Title

ANALYSIS OF THE MOLTEN POOL PRESENT IN THE NB-48TI ALLOY DURING ITS PROCESSING BY LASER POWDER BED FUSION

ANALYSIS OF THE MOLTEN POOL PRESENT IN THE NB-48TI ALLOY DURING ITS PROCESSING BY LASER POWDER BED FUSION

Authorship

MORAIS, WILLY ANK DE; LANDGRAF, FERNANDO JOSÉ GOMES

MORAIS, WILLY ANK DE

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LANDGRAF, FERNANDO JOSÉ GOMES

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DOI

10.5151/2594-5327-41632

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Abstract

In recent years, additive manufacturing (AM) by laser powder bed fusion process (LPBF) has increasingly been used for metals mainly due to its differential advantages. In this process, the dynamics of molten pool formation are decisive for the performance of an LPBF product, including specific unique properties, such as its crystalline texture. Thus, molten pool formation, geometry, and overlaps are subjects of continued interest in the literature. Within this context, the present work summarizes the main characteristics and conditions that control the formation and dynamics of molten pools and presents the results from samples of Nb-48Ti produced by the LPBF-AM process using an “island” strategy and two types of powders: a spherical (PAP) and irregularly shaped (HDP). The observations demonstrate that the irregular powder forms shallower and wider molten pools, the “island” strategy induces preferable regions of defect formation, and the roughness varies not only in the function of the powder type but also in the scale of quantifying.

In recent years, additive manufacturing (AM) by laser powder bed fusion process (LPBF) has increasingly been used for metals mainly due to its differential advantages. In this process, the dynamics of molten pool formation are decisive for the performance of an LPBF product, including specific unique properties, such as its crystalline texture. Thus, molten pool formation, geometry, and overlaps are subjects of continued interest in the literature. Within this context, the present work summarizes the main characteristics and conditions that control the formation and dynamics of molten pools and presents the results from samples of Nb-48Ti produced by the LPBF-AM process using an “island” strategy and two types of powders: a spherical (PAP) and irregularly shaped (HDP). The observations demonstrate that the irregular powder forms shallower and wider molten pools, the “island” strategy induces preferable regions of defect formation, and the roughness varies not only in the function of the powder type but also in the scale of quantifying.

Keywords

Additive Manufacturing; Laser Powder Bed Fusion; LPBF; Molten Pool; Conduction mode melting; Keyhole-mode melting.

Additive Manufacturing; Laser Powder Bed Fusion; LPBF; Molten Pool; Conduction mode melting; Keyhole-mode melting.