Fatigue strength of Co–Cr–Mo alloy clasps prepared by selective laser melting

Kajima, Yuka; Takaichi, Atsushi; Nakamoto, Tetsuji; Kimura, Tsuyoshi; Yogo, Yoshiaki; Ashida, Maki; Doi, Hisashi; Nomura, Naoyuki; Takahashi, Hidekazu; Hanawa, Takao; Wakabayashi, Noriyuki

doi:10.1016/j.jmbbm.2016.02.032

Cited by 135 publications

(95 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This suggests that with the optimized parameters for full density, the Al-12Si SLM samples will show repeatable/reproducible tensile properties within the experimental errors. However, there are reports of anisotropy in the SLM produced samples and the mechanical properties vary depending on the building direction [30][31][32][33]. Alsalla et al have shown that the tensile strength and the fracture toughness of the 316L cellular lattice manufactured by the SLM technique, depends greatly on the building direction.…”

Section: Methodsmentioning

confidence: 99%

Additive Manufacturing: Reproducibility of Metallic Parts

et al. 2017

View full text Add to dashboard Cite

Abstract:The present study deals with the properties of five different metals/alloys (Al-12Si, Cu-10Sn and 316L-face centered cubic structure, CoCrMo and commercially pure Ti (CP-Ti)-hexagonal closed packed structure) fabricated by selective laser melting. The room temperature tensile properties of Al-12Si samples show good consistency in results within the experimental errors. Similar reproducible results were observed for sliding wear and corrosion experiments. The other metal/alloy systems also show repeatable tensile properties, with the tensile curves overlapping until the yield point. The curves may then follow the same path or show a marginal deviation (~10 MPa) until they reach the ultimate tensile strength and a negligible difference in ductility levels (of~0.3%) is observed between the samples. The results show that selective laser melting is a reliable fabrication method to produce metallic materials with consistent and reproducible properties.

show abstract

Section: Methodsmentioning

confidence: 99%

Additive Manufacturing: Reproducibility of Metallic Parts

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Due to the unique microstructure, the mechanical anisotropy was conirmed in the samples, but the yield strength, Ultimate Tensile Strength (UTS), and elongation were higher than that of the cast alloy. The research of Kajima et al [65] shows that the microstructure of SLM specimens of Co-Cr-Mo alloys is quite diferent from those of the cast samples, which consists of coarse dendrites with visible precipitates in the inter-dendritic regions. The ine cellular dendrites with diameter about 0.5 μm were observed in the SLM samples parallel to the building direction, while in directions, perpendicular or inclined at 45° to the building direction, ine columnar structures with diameter about 0.5 μm, elongated along the building direction, were found.…”

Section: Properties Of Co-cr Dental Alloys Fabricated Via Slmmentioning

confidence: 99%

“…The higher values concern to the lower sloping angle to the basis of 8°, while the lower values for the larger angle of 70°. The research of Kajima et al [65] conirmed that the surface roughness depends on the building direction. It is the lowest in the samples, perpendicular to the building direction, Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies http://dx.doi.org/10.5772/intechopen.69718 149 Ra = 10.22 μm, followed by that of the samples, inclined at 45 o with Ra = 13.67 μm, and the highest in the samples, parallel to the building direction, Ra = 18.17 μm.…”

mentioning

confidence: 95%

Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

Dikova¹

2018

Biomaterials in Regenerative Medicine

View full text Add to dashboard Cite

The aim of the present paper is to make a review of the properties of dental alloys, fabricated using Additive Technologies (AT). The microstructure and mechanical properties of Co-Cr alloys as well as the accuracy and surface roughness of dental constructions are discussed. In dentistry two diferent approaches can be applied for production of metal frameworks using AT. According to the irst one the wax/polymeric cast paterns are fabricated by 3D printing, than the constructions are cast from dental alloy with asprinted paterns. Through the second one the metal framework is manufactured form powder alloy directly from 3D virtual model by Selective Electron Beam Melting (SEBM) or Selective Laser Melting (SLM). The microstructure and mechanical properties of Co-Cr dental alloys, cast using 3D printed paterns, are typical for cast alloys. Their dimensional and adjustment accuracy is higher comparing to constructions, produced by traditional lost-wax casting or by SLM. The surface roughness is higher than that of the samples, cast by conventional technology, but lower comparing to the SLM objects. The microstructure of SLM Co-Cr dental alloys is ine grained and more homogeneous comparing that of the cast alloys, which deines higher hardness and mechanical properties, higher wear and corrosion resistance.Keywords: materials science and engineering, biomaterials, regenerative stomatology, additive technologies, Co-Cr dental alloys, microstructure and properties IntroductionDental alloys on the basis of cobalt and chromium are one of the most preferred for production of metal frameworks of dental constructions because of their high strength, high corrosion and wear resistance, high biocompatibility, and a relatively low cost [1,2]. The chemical composition of Co-Cr dental alloys consists of 53-67% of Co, 25-32% of Cr, 2-6% of Mo, and small © 2018 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.quantities of W, Si, Al, and others [3]. Cr, Mo, and W are added for strengthening of the solid solution. Due to the relatively large amount of Cr, dense passive layer of Cr 2 O 3 with 1-4 nm thickness on the surface as well as carbides in the microstructure of the details is formed, determining the high hardness, high corrosion, and wear resistance [4,5]. According to the phase diagram, Co-Cr dental alloys are characterized with face-centered cubic (fcc) latice, γ phase in high temperatures, and with hexagonal close packed (hcp) latice, ε phase in room temperature [4,6]. The γ phase deines the ductility, while the ε phase deines the corrosion and wear resistance of the alloy [7]. In proper alloying, the microstructure of the Co-Cr dental alloys consists mainly of γ phase and carbides of the M 23 C 6 type [4]. Therefore, the properties of Co-Cr dental alloys depend on the ratio between...

show abstract

“…Thus, the strategies for guaranteeing an accurate fit of SLM objects should be researched further. For dental applications, SLM-fabricated restorations should retain sufficient mechanical properties and fatigue resistance, which are directly affected by the alloy microstructures [1,11,12]. Even a little residual porosity in the SLM parts may be problematic for some applications where high strength and fatigue resistance are necessary [5].…”

mentioning

confidence: 99%

“…During the SLM process, therefore, various factors such as applied process parameters and cooling cycles should be optimized carefully, depending on the alloy powder materials used (e.g., type and size distribution) [2,6,13]. In particular, the anisotropy of the mechanical properties is a unique characteristic of SLM builds For dental applications, SLM-fabricated restorations should retain sufficient mechanical properties and fatigue resistance, which are directly affected by the alloy microstructures [1,11,12]. Even a little residual porosity in the SLM parts may be problematic for some applications where high strength and fatigue resistance are necessary [5].…”

mentioning

confidence: 99%

Fabricating High-Quality 3D-Printed Alloys for Dental Applications

2017

View full text Add to dashboard Cite

Featured Application: This article will help to find main points to be considered while applying selective laser melting technology in dentistry.Abstract: Metal additive manufacturing (AM), especially selective laser melting (SLM), has been receiving particular attention because metallic functional structures with complicated configurations can be effectively fabricated using the technique. However, there still exist some future challenges for the fabrication of high-quality SLM products for dental applications. First, the surface quality of SLM products should be further improved by standardizing the laser process parameters or by appropriately post-treating the surface. Second, it should be guaranteed that dental SLM restorations have good dimensional accuracy and, in particular, a good marginal fit. Third, a definitive standard regarding building and scanning strategies, which affect the anisotropy, should be established to optimize the mechanical properties and fatigue resistance of SLM dental structures. Fourth, the SLM substructure's bonding and support to veneering ceramic should be further studied to facilitate the use of esthetic dental restorations. Finally, the biocompatibility of SLM dental alloys should be carefully examined and improved to minimize the potential release of toxic metal ions from the alloys. Future research of SLM should focus on solving the above challenges, as well as on fabricating dental structures with "controlled" porosity.Keywords: additive manufacturing; anisotropy; dental alloy; selective laser melting Additive manufacturing (AM), also known as three-dimensional (3D) printing or rapid prototyping, is the process of joining materials to make 3D objects from digital data, usually layer upon layer [1,2]. Metal AM, especially selective laser melting (SLM), has been receiving particular attention because metallic functional structures with complicated configurations in various industrial, medical, and dental sectors can now be fabricated using this technique [1][2][3]. However, due to the complex nature of metal AM, there still exist many challenges for the successful fabrication of high-quality metallic products with favorable microstructures and properties [3]. In particular, several challenges need to be solved in order to apply the SLM technology widely in dental applications, replacing conventional techniques such as casting [1].It has been known that the SLM technique can produce 3D objects with minimal pre-processing and/or post-processing requirements [3]. In reality, however, the supporting structure created in the manufacturing stage must be manually removed after the final 3D product is completed [2,4].

show abstract

Fatigue strength of Co–Cr–Mo alloy clasps prepared by selective laser melting

Cited by 135 publications

References 49 publications

Additive Manufacturing: Reproducibility of Metallic Parts

Additive Manufacturing: Reproducibility of Metallic Parts

Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

Fabricating High-Quality 3D-Printed Alloys for Dental Applications

Contact Info

Product

Resources

About