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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 764, SEP 9 2019.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 16/09350-2 - Development of customized metallic implants using direct metal laser sintering
Grantee:Rubens Maciel Filho
Support Opportunities: Research Grants - Visiting Researcher Grant - International