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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 10/2018

13-09-2018

Microstructural Characterization, Mechanical Properties, and Corrosion Resistance of Dental Co-Cr-Mo-W Alloys Manufactured by Selective Laser Melting

Authors: Wei Wei, Yanan Zhou, Wenbo Liu, Ning Li, Jiazhen Yan, Haopeng Li

Published in: Journal of Materials Engineering and Performance | Issue 10/2018

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Abstract

In this paper, the microstructure, mechanical properties, and corrosion resistance of the dental Co-Cr-Mo-W alloys fabricated by selective laser melting (SLM) were systematically investigated and correlated. The microstructure of the SLM group (SG) specimens is composed of extremely fine columnar crystals, exhibiting supersaturated and homogeneous character. The matrix mainly consists of face-centered-cubic (FCC) cobalt solid solutions, and minimal hexagonal-close-packed (HCP) cobalt solid solutions. Mechanical test results showed that the 0.2% yield strength of SG was 775 ± 7 MPa, and the ultimate tensile strength was 1118 ± 25 MPa. The elongation of SG was 8.28 ± 0.4%, and the microhardness of SG was 476 ± 10 HV. All of these values largely exceeded the cast group (CG) specimens. The high strength is attributed to their fine columnar crystals and supersaturated matrices. The fewer content from the HCP phase and a lack of intermetallic compounds or eutectic contribute to the high ductility. Furthermore, a higher Ecorr, lower Icorr were acquired for better corrosion resistance compared to cast specimens, due to even less composition segregation and more microstructural homogeneity.
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Metadata
Title
Microstructural Characterization, Mechanical Properties, and Corrosion Resistance of Dental Co-Cr-Mo-W Alloys Manufactured by Selective Laser Melting
Authors
Wei Wei
Yanan Zhou
Wenbo Liu
Ning Li
Jiazhen Yan
Haopeng Li
Publication date
13-09-2018
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 10/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3520-6

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