Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Comparing Spherical and Irregularly Shaped Powders in Laser Powder Bed Fusion of Nb47Ti Alloy

Full text
Author(s):
Show less -
Guzman, Jhoan [1, 2] ; de Moura Nobre, Rafael [1] ; Rodrigues Junior, D. L. [1] ; de Morais, Willy Ank [1] ; Nunes, Enzo R. [1] ; Bayerlein, D. L. [3, 2] ; Falcao, R. B. [2] ; Sallica-Leva, Edwin [2] ; Oliveira, Henrique Rodrigues [4, 5] ; Chastinet, Victor Lira [4] ; Landgraf, Fernando J. G. [1]
Total Authors: 11
Affiliation:
[1] Univ Sao Paulo EPUSP, Dept Met & Mat Engn PMT, Polytech Sch, Ave Prof Mello Moraes, BR-2463 Butanta - Brazil
[2] Inst Technol Res IPT, Lab Met Proc LPM, Sao Paulo - Brazil
[3] Nucl & Energy Res Inst IPEN, Sao Paulo - Brazil
[4] SENAI Innovat Inst Mfg Syst & Laser Proc ISI, Florianopolis, SC - Brazil
[5] Fed Univ Santa Catarina UFSC, Lab Innovat Addit Mfg & Molding NIMMA, Grad Program Mech Engn POSMEC, Dept Mech Engn, Florianopolis, SC - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Materials Engineering and Performance; v. 30, n. 9, SI, p. 6557-6567, SEP 2021.
Web of Science Citations: 0
Abstract

Literature reports that irregularly shaped powder has lower flowability and apparent density than spherical shaped powder, factors that hinder its use in additive manufacturing, although its cost is potentially lower. In this study, four samples of Nb47Ti alloy manufactured by laser powder bed fusion from plasma atomized (PA) and hydride-dehydride (HDH) powders with different scanning strategies and interstitial element content were compared. Laser power levels of 200 W and 300 W were investigated. To keep a constant powder mass under the laser beam, the processing table displacement for samples from the HDH powder was twice larger than the 30 mu m used for samples from the PA powder procedure, due to the lower apparent density of the HDH powder. It was possible to achieve porosity levels below 1% with both powders. However, the power of 200 W generated 13% of porosity in the HDH samples. A similar microstructure formed by melt pools and cellular dendritic structure in a beta phase matrix of body-centered cubic (BCC) structure was obtained in all samples. Furthermore, the low interstitial element content of samples from PA powder resulted in lower microhardness when compared to the higher interstitial element content of samples from HDH powder. (AU)

FAPESP's process: 16/50199-6 - Nb-Ti and Ti-Nb-Zr orthopaedic prosthesis obtained through selective laser melting
Grantee:Fernando Jose Gomes Landgraf
Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE
FAPESP's process: 17/20877-5 - Effect of laser selective fusion process parameters on Ti-13% Nb-13% Zr and Nb-47% Ti alloys microstructure
Grantee:Edwin Sallica Leva
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/20926-6 - Study of hydride, milling and dehydration of Ti-13%Nb-13%Zr and Nb-47%Ti alloys
Grantee:Railson Bolsoni Falcão
Support Opportunities: Scholarships in Brazil - Post-Doctoral