Effects of thermal treatments on microstructure and mechanical properties of a Co–Cr–Mo–W biomedical alloy produced by laser sintering

Mengucci, P.; Barucca, G.; Gatto, Andrea; Bassoli, Elena; Denti, Lucia; Fiori, F.; Girardin, Éric; Bastianoni, P; Rutkowski, Bogdan; Czyrska‐Filemonowicz, A.

doi:10.1016/j.jmbbm.2015.12.045

Cited by 96 publications

(35 citation statements)

References 39 publications

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“…The fractography ( Figure 5(c)) of tensile specimen presented the formation of dimples, which represents a region of greater ductility and toughness. The TRS test results 2501.2 ± 9.7 MPa was satisfactory in accordance to experimental Menguci et al [22] results. TRS result for a similar composition of Co-Cr-Mo alloy, after the shoot-peened treatment followed by heat treatment for strain relief, result a TRS equal to 2700 ± 25 MPa.…”

Section: Mechanical Analysissupporting

confidence: 87%

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

Mergulhão¹,

Neves²

2018

JBNB

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Biomaterial powders are in high development due to expansion of additive manufacturing (AM) processes. Selective laser melting (SLM) is a particular AM technology, which completely melts a powder bed layer by laser beam. Investigations of appropriated physical properties of feedstock (powder alloy) were the aim of this study. Cobalt-chromium-molybdenum (Co-Cr-Mo) alloy was used to overview of gas-atomized powder properties in different granulometric ranges (D1 12 -19 μm, D2 20 -46 μm and D3 76 -106 μm), as their: physical, chemical properties and thermal analysis. SLM manufactured standard tensile specimens of usually granulometric range powder size provided mechanical, chemical and thermal properties of biocompatible Co-Cr-Mo alloy. The physical properties showed that powders in the range of 20 to 50 µm provide a better flow ability and packed density, which are relevant characteristics to SLM processing. Manufacturing by SLM process provided suitable mechanical properties in the health area, as well as, maintained the biocompatible properties of the Co-Cr-Mo alloy.

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Section: Mechanical Analysissupporting

confidence: 87%

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

Mergulhão¹,

Neves²

2018

JBNB

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“…The composition of the Co-Cr alloy when using the laser sintered technique has a lower molybdenum content. The Co-Cr-M and Co-Cr-M-W alloy showed a remarkable increase in hardness after thermal treatment, by producing a homogeneous microstructure comprised of an intricate network [54,55]. There are some studies focusing on comparisons between corrosion behavior, cytotoxicity, and bond strength, and veneering porcelain, between different, commercially available Co-Cr alloys.…”

Section: Discussionmentioning

confidence: 99%

Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings

et al. 2017

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Abstract:Laser sintered technology has been introduced for clinical use and can be utilized more widely, accompanied by the digitalization of dentistry and the development of direct oral scanning devices. This study was performed with the aim of comparing the marginal accuracy and internal fit of Co-Cr alloy copings fabricated by casting, CAD/CAM (Computer-aided design/Computer-assisted manufacture) milled, and 3-D laser sintered techniques. A total of 36 Co-Cr alloy crown-copings were fabricated from an implant abutment. The marginal and internal fit were evaluated by measuring the weight of the silicone material, the vertical marginal discrepancy using a microscope, and the internal gap in the sectioned specimens. The data were statistically analyzed by One-way ANOVA (analysis of variance), a Scheffe's test, and Pearson's correlation at the significance level of p = 0.05, using statistics software. The silicone weight was significantly low in the casting group. The 3-D laser sintered group showed the highest vertical discrepancy, and marginal-, occlusal-, and averageinternal gaps (p < 0.05). The CAD/CAM milled group revealed a significantly high axial internal gap. There are moderate correlations between the vertical marginal discrepancy and the internal gap variables (r = 0.654), except for the silicone weight. In this study, the 3-D laser sintered group achieved clinically acceptable marginal accuracy and internal fit.

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“…In addition, post-manufacturing heat treatment was not performed for all the test groups. Therefore, the differences in microstructures and mechanical properties cannot be attributable only to different processing techniques; this should be considered a limitation of this study [31]. …”

Section: Discussionmentioning

confidence: 99%

Microstructures and Mechanical Properties of Co-Cr Dental Alloys Fabricated by Three CAD/CAM-Based Processing Techniques

et al. 2016

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The microstructures and mechanical properties of cobalt-chromium (Co-Cr) alloys produced by three CAD/CAM-based processing techniques were investigated in comparison with those produced by the traditional casting technique. Four groups of disc- (microstructures) or dumbbell- (mechanical properties) specimens made of Co-Cr alloys were prepared using casting (CS), milling (ML), selective laser melting (SLM), and milling/post-sintering (ML/PS). For each technique, the corresponding commercial alloy material was used. The microstructures of the specimens were evaluated via X-ray diffractometry, optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy, and electron backscattered diffraction pattern analysis. The mechanical properties were evaluated using a tensile test according to ISO 22674 (n = 6). The microstructure of the alloys was strongly influenced by the manufacturing processes. Overall, the SLM group showed superior mechanical properties, the ML/PS group being nearly comparable. The mechanical properties of the ML group were inferior to those of the CS group. The microstructures and mechanical properties of Co-Cr alloys were greatly dependent on the manufacturing technique as well as the chemical composition. The SLM and ML/PS techniques may be considered promising alternatives to the Co-Cr alloy casting process.

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Effects of thermal treatments on microstructure and mechanical properties of a Co–Cr–Mo–W biomedical alloy produced by laser sintering

Cited by 96 publications

References 39 publications

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings

Microstructures and Mechanical Properties of Co-Cr Dental Alloys Fabricated by Three CAD/CAM-Based Processing Techniques

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