Microstructural evolution and resulting properties of differently sintered and heat-treated binder-jet 3D-printed Stellite 6.

Autor: Mostafaei A; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA. Electronic address: amir.mostafaei@pitt.edu., Rodriguez De Vecchis P; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA., Buckenmeyer MJ; Department of Bioengineering, McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA., Wasule SR; Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, Mumbai 400076, India., Brown BN; Department of Bioengineering, McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA; Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Womens Hospital, Pittsburgh, PA 15213, USA., Chmielus M; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA. Electronic address: chmielus@pitt.edu.
Jazyk: angličtina
Zdroj: Materials science & engineering. C, Materials for biological applications [Mater Sci Eng C Mater Biol Appl] 2019 Sep; Vol. 102, pp. 276-288. Date of Electronic Publication: 2019 Apr 06.
DOI: 10.1016/j.msec.2019.04.011
Abstrakt: Stellite 6 components are manufactured from gas-atomized powder using binder-jet 3D-printing (BJ3DP) followed by curing and sintering steps for densification. Green parts are sintered at temperatures ranging from 1260 °C to 1310 °C for 1 h. Microstructural evolution and phase formation during sintering and aging are studied by optical and scanning electron microscopy, elemental analysis and X-ray diffraction. It was found that solid-state sintering was present at temperatures below 1280 °C with Cr-rich carbides present within grains; while supersolidus liquid phase sintering was the dominant sintering mechanism during sintering at 1290 °C and higher in which the Co-rich solid solution regions are surrounded by eutectic carbides. Sintering at 1300 °C resulted in the maximum density of ~99.8%, mean grain size of ~98 ± 6 μm with an average hardness of 307 ± 15 HV 0.1 and 484 ± 30 HV 0.1 within grain and at the boundaries, respectively. Aging was performed at 900 °C for 10 h leading to the martensitic transformation (fcc → hcp) as well as an increase in eutectic carbides at boundaries and nano-sized carbides within grains where the average hardness within grains and boundaries was enhanced to 322 ± 29 HV 0.1 and 491 ± 58 HV 0.1 , respectively. Fibroblasts seeded on top of 3D-printed Stellite 6 discs displayed a cell viability of 98.8% ± 0.2% after 48 h, which confirmed that these materials are non-cytotoxic. Presented results demonstrate that binder jetting can produce mechanically sound complex-shaped structures as shown here on a denture metal framework and small-scale knee model.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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