Agradecimentos: The authors are grateful for the assistance L. F. Bernardes and D. C. de Araujo provided with the manufacturing of the specimens. The experimental support of F.E. Montoro (project SEM 21795) at the Brazilian Nanotechnology National Laboratory is also acknowledged. This study used the...

Agradecimentos: The authors are grateful for the assistance L. F. Bernardes and D. C. de Araujo provided with the manufacturing of the specimens. The experimental support of F.E. Montoro (project SEM 21795) at the Brazilian Nanotechnology National Laboratory is also acknowledged. This study used the resources of the Brazilian Synchrotron Light Laboratory (project 20170162), an open national facility operated by the Brazilian Center for Research in Energy and Materials for the Brazilian Ministry for Science, Technology, Innovations and Communications. We would like to thank the X-ray Scattering and Thermo-Mechanical Simulation beamline staff (L. Wu) for the assistance during the synchrotron experiments. The microstructural characterization of the specimens was performed at LNNano and the Analytical Center of UFC/CT-INFRA/MCTI-SISNANO. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil, Finance Code 001, and São Paulo Research Foundation - FAPESP (grant number 2016/09350-2)

The influence of strain-induced martensitic transformation on the mechanical properties of a Co-28Cr-6Mo alloy produced using the direct metal laser sintering additive manufacturing technique was analyzed. Both the as-built and solution heat-treated (ST) specimens were subjected to conventional...

The influence of strain-induced martensitic transformation on the mechanical properties of a Co-28Cr-6Mo alloy produced using the direct metal laser sintering additive manufacturing technique was analyzed. Both the as-built and solution heat-treated (ST) specimens were subjected to conventional tensile tests. Furthermore, X-ray diffraction spectra were simultaneously acquired using a synchrotron light source. In addition, electron backscatter diffraction analysis was performed on the specimens before and after tensile testing. Both techniques revealed the occurrence of the strain-induced gamma-face-centered cubic -> epsilon-hexagonal close-packed phase transformation. The higher microstrain and preferential grain orientation of the as-built specimen favored the onset of the phase transformation. Moreover, the ductility of the ST specimen was significantly higher than that of the as-built specimen. This behavior was attributed to the isotropic properties of the randomly-oriented and equiaxed grains, increase in resistance to necking, and reduction in internal stresses caused by the solution heat treatment

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2016/09350-2

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

Fechado