Mechanical Properties of Selective Laser Melted CoCr Alloys: A Review

Saini, J.S.; Dowling, Luke; Trimble, Daniel; Singh, Daljeet

doi:10.1007/s11665-021-06283-1

Cited by 14 publications

(9 citation statements)

References 86 publications

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“…As a result, the FCC structure is usually retained at room temperature. This -martensitic transformation can be induced athermally (by quenching from temperatures related to the region of FCC stabilisation), isothermally (by ageing between 650°C and 950°C) or through plastic strain [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of heat-treated cobalt–chromium alloy fabricated by selective laser melting

Lambrou

Kaldellis

Stergiou

et al. 2022

Materials Science and Technology

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The present work focuses on the stress-relief annealing (SRA) modification and porcelain firing (PF) treatment effect in biomedical Cobalt–Chromium (Co–Cr) components for dental applications components produced by the SLM process. The specimens’ phase transformation was examined by X-ray diffraction, optical microscopy, scanning and transmission electron microscopy, combined with energy dispersive X-ray spectroscopy. The corresponding mechanical properties were assessed by compression tests and Vickers hardness measurements. The matrix microstructure consisted mainly of the FCC γ phase with a small amount of the HCP-structured ϵ phase. SRA at 750°C and 950°C, followed by PF at the 930°C treatment, increased the percentage of the ϵ phase and caused the precipitation of fine carbides and intermetallic precipitates, thus improving the final mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Characterisation of heat-treated cobalt–chromium alloy fabricated by selective laser melting

Lambrou

Kaldellis

Stergiou

et al. 2022

Materials Science and Technology

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“…niT (%) Na Figura 66 é observada da microestrutura das amostras obtidas por FP após processo GHANI et al, 2020;CORNACCHIA et al, 2022;HONG;YEOH, 2020;KIM, K. S. et al, 2020;RAZAVI et al, 2021;SAINI et al, 2021;SING et al, 2020) exeto pela elevada tensão máxima obtida especificamente para as amostras consolidadas com P de 147 W. Com base na literatura, mesmo em níveis de P superiores que 200 W, amostras submetidadas a tração não obtiveram valores correspondentes ao observado.…”

Section: Estudo De Solubilizaçãounclassified

“…Em relação ao alongamento total evidenciou em grande maioria das amotras valores inferiores que 8%. No caso, o alongamento resultante de amostras processadas por FLP-L na condição CF evidenciam valores da grandeza entre 4 até 18% (SAINI et al, 2021). Conforme abordado em revisão bibliográfica, em razão as características do processo de FLP-L propiciarem valores baixos especificamente pela microestrutura formada e porosidade, o uso de pós-processamentos térmicos são utilizados para otimizar o alongamento das peças (CORNACCHIA et al, 2022;RAZAVI et al, 2021;SING et al, 2020).…”

Section: Estudo De Solubilizaçãounclassified

“…No caso da amostra processada por FP a dureza evidenciou ser inferior as amostras processadas por FLP-L. A verificação da dureza em relação ao limite de dureza (266 a 345 HV) requerido pela norma ASTM F75 evidencia que as amostras FLP-L alcançaram valores muito superiores. Neste caso, justifica-se a necessidade de realização de tratamentos térmicos para adequar a dureza das amostras processadas por FLP-L. Os níveis de dureza obtidos na liga de Co-Cr-Mo processadas por FLP-L também são destacados pelos autores (SAINI et al, 2021; Figura 70 -Resultado de dureza Vickers da liga de Co-Cr-Mo processadas por P de 125W e 147W nas estratégias de varredura S45/135, S67 e S2F67, em comparação com o processo de FP.…”

Section: Análise De Durezaunclassified

“…Cr via FLP-L. Em adicional, são destacados na literatura diversos níveis de P variando de 25 a 500 W e Vv variando de 33 a 2500 mm/s(SAINI et al, 2021).Tabela 6 -Relação da DEv utilizada em ligas à base de Co-Cr por FLP-L resultantes de altas densidades relativas. particularidades associadas aos processos de FLP-L dependentes da orientação de fabricação, microestrutura, textura, defeitos e a realização de tratamentos térmicos contribuem para minimizar esses efeitos nas propriedades finais das peças.…”

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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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Cobalt‐Chromium Alloy Additive Manufacturing Technologies for Biomedical Applications

Pawar,

Kumar,

Ballav

2024

Advances in Additive Manufacturing

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Mechanical Properties of Selective Laser Melted CoCr Alloys: A Review

Cited by 14 publications

References 86 publications

Characterisation of heat-treated cobalt–chromium alloy fabricated by selective laser melting

Characterisation of heat-treated cobalt–chromium alloy fabricated by selective laser melting

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

Cobalt‐Chromium Alloy Additive Manufacturing Technologies for Biomedical Applications

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