Abstract:
Monotonic mechanical properties of beta Nb-48%Ti and martensitic Ti-13%Nb-13%Zr alloys
processed through Laser Powder Bed Fusion (LPBF) with two different types of powder, spherical
plasma atomized powder (PA) and irregular shaped powder produced by Hydrogenation-millingdehydrogenation process (HDH), are compared.Rods with 12 mm diameter and 92 mm length were produced through L-PBF. Laser power and scanning speed were selected based on achievement of porosity below 0.5% and all rods were produced with the same scaning strategy. The operation platforms were heat treated for stress relief at 650⁰C for two hours before removing the rods through wire electro discharge machining. All rods were machined with turning to obtain specimens for tensile tests performed with universal machine. For both alloys, specimens cast with HDH powder presented higher strength and lower ductility than
the specimens cast with PA powder. This is attributed to the solid solution hardening promoted by
the higher oxygen content of the HDH powder. Fracture analysis was performed in order to correlate mechanical properties with fractographic and microstructure features of the alloy/powder sets.
Reference:
BOCCALINI JUNIOR, Mário; FALCÂO, Railson B.; MOREIRA, Marcelo Ferreira; LIMA, Moysés Leite de; LANDGRAF, Fernando José Gomes. Mechanical behavior of additive manufactured Nb-Ti and Ti-Nb-Zr alloys using plasma atomized and HDH powders. In: METAL ADDITIVE MANUFACTURING CONFERENCE, 3., 2022, Austria. Proceedings… 10p.
Document with restricted access. Login to BiblioInfo Library-DAIT/IPT to access the PDF text:
https://escriba.ipt.br/pdf_restrito/178127.pdf
Monotonic mechanical properties of beta Nb-48%Ti and martensitic Ti-13%Nb-13%Zr alloys
processed through Laser Powder Bed Fusion (LPBF) with two different types of powder, spherical
plasma atomized powder (PA) and irregular shaped powder produced by Hydrogenation-millingdehydrogenation process (HDH), are compared.Rods with 12 mm diameter and 92 mm length were produced through L-PBF. Laser power and scanning speed were selected based on achievement of porosity below 0.5% and all rods were produced with the same scaning strategy. The operation platforms were heat treated for stress relief at 650⁰C for two hours before removing the rods through wire electro discharge machining. All rods were machined with turning to obtain specimens for tensile tests performed with universal machine. For both alloys, specimens cast with HDH powder presented higher strength and lower ductility than
the specimens cast with PA powder. This is attributed to the solid solution hardening promoted by
the higher oxygen content of the HDH powder. Fracture analysis was performed in order to correlate mechanical properties with fractographic and microstructure features of the alloy/powder sets.
Reference:
BOCCALINI JUNIOR, Mário; FALCÂO, Railson B.; MOREIRA, Marcelo Ferreira; LIMA, Moysés Leite de; LANDGRAF, Fernando José Gomes. Mechanical behavior of additive manufactured Nb-Ti and Ti-Nb-Zr alloys using plasma atomized and HDH powders. In: METAL ADDITIVE MANUFACTURING CONFERENCE, 3., 2022, Austria. Proceedings… 10p.
Document with restricted access. Login to BiblioInfo Library-DAIT/IPT to access the PDF text:
https://escriba.ipt.br/pdf_restrito/178127.pdf
