Rapid Solidification and Laser Cladding of Gas Atomized Ni-Nb-Sn Bulk Metallic Glass

F.L. Catto; A.H.G. Gabriel; C. Bolfarini; Claudio Shyinti Kiminami; Conrado Ramos Moreira Afonso

doi:10.4028/www.scientific.net/MSF.899.311

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HomeMaterials Science ForumMaterials Science Forum Vol. 899Rapid Solidification and Laser Cladding of Gas...

Rapid Solidification and Laser Cladding of Gas Atomized Ni-Nb-Sn Bulk Metallic Glass

Abstract:

Glassy overspray powders of Ni₅₉Nb₃₅Sn₆ (at%) bulk metallic glass (BMG) obtained by spray forming were used in order to produce coatings on AISI 1020 mild steel substrate by laser cladding of the pre-placed powders. Different laser parameters, resulting in a variation of the power density, PD (J/mm2), were tested with a Yb fiber laser (up to 500 W). Gas atomized powders, suction cast sample trough copper mold casting and the laser clad tracks were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and coatings were subjected to measurements of Vickers microhardness. Atomized powder obtained showed no crystalline phases formation up to 425 μm, indicating good glass forming ability (GFA) of Ni₅₉Nb₃₅Sn₆ (at%) alloy. Microstructure characterization confirmed maximum glassy dimension of t_c =1mm for the Ni₅₉Nb₃₅Sn₆ (at%). Laser cladding track showed nanocrystalline phases embedded in a glassy matrix with Vickers microhardness ranging from 336 to 1184 HV.

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Periodical:

Materials Science Forum (Volume 899)

Pages:

311-316

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.899.311

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Online since:

July 2017

Authors:

F.L. Catto*, A.H.G. Gabriel, C. Bolfarini, Claudio Shyinti Kiminami, Conrado Ramos Moreira Afonso

Keywords:

Bulk Metallic Glass, Laser Cladding, Ni-Based Alloy, Overspray Powder, Rapid Solidification

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