Valuation of Mechanical Properties and Microstructural Characterization of ASTM F75 Co-Cr Alloy Obtained by Selective Laser Melting (SLM) and Casting Techniques

Mergulhão, Marcello Vertamatti; Podestá, Carlos Eduardo; Neves, Maurício David Martins das

doi:10.4028/www.scientific.net/msf.899.323

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…There is an important knowledge to understand the powder properties, to correlation with the dimensional, mechanical and microstructural characterization in the consolidation of specimens with this technology, as reported recently [8] [9] [10].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Mergulhão¹,

Neves²

2018

JBNB

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“…A partir da pesquisa desenvolvida durante o mestrado evidenciaram-se muitos desdobramentos e novos resultados possíveis que apontaram para a necessidade de aprofundamento da pesquisa em curso, por meio de um doutorado. Em estudos comparativos (MERGULHÃO, 2017;MERGULHÃO et al, 2017MERGULHÃO et al, , 2018 utilizando a liga de Co-Cr-Mo processada por fundição de precisão e FLP-L evidenciaram resultados significativos do ganho de propriedades mecânicas e homogeneidade da microestrutura formada em amostras padronizadas pelo processo de MA.…”

Section: Motivação E Originalidadeunclassified

Fusão em leito de pó a laser da liga de Co-Cr-Mo: propriedades mecânicas e microestrutura após tratamentos térmicos

Mergulhão¹

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MERGULHÃO, Marcello V. Laser powder bed fusion of Co-Cr-Mo alloy: mechanical properties and microstructure after heat treatment. 2022. 154 p. Tese (Doutorado em Tecnologia Nuclear) -Instituto de Pesquisas Energéticas e Nucleares -IPEN-CNEN/SP. São Paulo. Powder bed fusion by laser (PBF-L) stands out among the main processes of additive manufacturing (AM) for manufacturing parts with highly complex geometry and weight relief, specially in the aerospace and biomedical industries. The adequacy of the PBF-L process parameters and the performance of post-processing by heat treatments are fundamental to ensure the quality and optimize the useful life of medical prostheses and implants. Manufacturing Co-Cr-Mo alloys by PBF-L are the focus of recurrent research because they have great potential in the fabrication of customized medical and dental prostheses. So far, previous studies emphasize the optimization of macroscopic properties, such as aging behavior. In Co-Cr-Mo alloys there are few literatures covering the processing window and its relationship with the microstructural and mechanical characteristics. This work presents an investigation of the main parameters of the PBF-L process in a standardized Co-Cr-Mo alloy ASTM F75 through the effects and influences of laser additive manufacturing through mechanical analysis and microstructure obtained in the samples.Additionally, heat treatment by solubilization was carried out in the PBF-L Co-Cr-Mo alloy processed. The analyzes obtained were compared with the conventional precision casting route. The results obtained allowed to determine the appropriate FLP-L process parameters for the Co-Cr-Mo alloy, allowing a microstructure with no defects, obtaining densifications higher than 99%. The investigated process-property relationships are important to define the influence of the analyzed parameters in the processing and can support the establishment of protocols in the standardization of the Co-Cr-Mo alloy FLP-L process.

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A novel heat treatment of the additively manufactured Co28Cr6Mo biomedical alloy and its effects on hardness, microstructure and sliding wear behavior

2022

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Co28Cr6Mo alloy (ASTM F75 and F1537) is one of the standard biomaterials for permanent orthopedic implants, utilized especially in case of joint replacement, such as knee and ankle prostheses. At the present, innovative Additive Manufacturing (AM) technologies, such as laser-based powder bed fusion (LPBF), also known as selective laser melting (SLM), enable the production of customized medical devices with improved mechanical properties. When dealing with implants for joint replacement, wear resistance is critical and, unlike compressive and tensile properties, the knowledge on wear behavior of the LPBF Co28Cr6Mo alloy is currently limited. Furthermore, the effect of post-process heat treatment on tribological properties, that have to be customized on the peculiar microstructure induced by LPBF, needs to be assessed. In this view, the present work first focuses on a novel direct aging treatment of the LPBF Co28Cr6Mo alloy, performed in the range 600–900 °C up to 180 min, and investigates the effects on hardness and microstructural features, with the optimized heat-treated condition found in case of 850 °C for 180 min aging treatment. Then, the attention is driven to the dry sliding wear behavior of as-built and heat-treated LPBF Co28Cr6Mo alloy, considering the conventional wrought alloy as benchmark. For testing conditions closer to the in-service ones, the as-built LPBF alloy showed a wear resistance higher than the conventional wrought alloy. The optimized aging treatment significantly modified the as-built LPBF microstructure, it improved the alloy hardness and, in general, it positively affected its friction and wear behavior.

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Valuation of Mechanical Properties and Microstructural Characterization of ASTM F75 Co-Cr Alloy Obtained by Selective Laser Melting (SLM) and Casting Techniques

Cited by 6 publications

References 8 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

Fusão em leito de pó a laser da liga de Co-Cr-Mo: propriedades mecânicas e microestrutura após tratamentos térmicos

A novel heat treatment of the additively manufactured Co28Cr6Mo biomedical alloy and its effects on hardness, microstructure and sliding wear behavior

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