Effect of phase transformation on ductility of additively manufactured Co-28Cr-6Mo alloy: An in situ synchrotron X-ray diffraction study during mechanical testing

Autor(es)

Antunes, L. H. M. ^[1] ; Hoyos, J. J. ^[2] ; Fonseca, E. B. ^[1] ; Beres, M. ^{[3, 4]} ; da Silva Farina, P. F. ^[1] ; Lopes, E. S. N. ^[1] ; Jardini, A. L. ^[3] ; Maciel Filho, R. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Mech Engn, Rua Mendeleyev 200, BR-13083860 Campinas, SP - Brazil

^[2] State Univ Ponta Grosso, Mat Engn Dept, Av Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa - Brazil

^[3] Univ Estadual Campinas, Fac Chem Engn, Natl Inst Biofabricat, Av Albert Einstein 500, BR-13083852 Campinas, SP - Brazil

^[4] Univ Fed Ceara, Dept Met & Mat Engn, Av Humberto Monte, BR-60445554 Fortaleza, CE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 764, SEP 9 2019.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 16/09350-2 - Desenvolvimento de implantes customizados em biomateriais metálicos utilizando sinterização direta de metais por laser
• Beneficiário: Rubens Maciel Filho
• Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional