An investigation into the aging behavior of CoCrMo alloys fabricated by selective laser melting

Zhang, Mingkang; Yang, Yongqiang; Song, Changhui; Bai, Yuchao; Zhang, Xiao

doi:10.1016/j.jallcom.2018.04.054

Cited by 88 publications

(36 citation statements)

References 59 publications

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“…The fcc γ phase is the main matrix component of the SLS sample, what can be explained by the conditions of its production process. The critical value of thermal treatment for Co-based alloys, promoting martensitic transformation γ → ε, is 970 • C. To a lesser extent, the rate of martensitic transformation depends on the time of thermal treatment, as demonstrated by Zhang [40]. Therefore, the high proportion of the γ phase in Co-SLS can be explained by the high cooling rate characteristic of SLS [1,2] and low temperature of heat treatment (750 • C).…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Crystal Structure and Wear Resistance of Co-Based Alloys with Low Carbon Content Manufactured by Selective Laser Sintering and Powder Injection Molding

et al. 2020

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Cobalt alloys are widely used in biomedicine, implantology, and dentistry due to their high corrosion resistance and good mechanical properties. The high carbon improves the wear properties, but causes fragility and dangerous cracking of elements during use. The aim of the present work was to analyze and compare the structure and wear resistance of Co-based alloy samples with low carbon content, produced by Selective Laser Sintering (SLS) and Powder Injection Molding (PIM). Structure characterization, mainly with the use of transmission electron microscopy, was applied to investigate the differences in tribological properties. The better resistance to abrasive wear for SLS was explained by the presence of a hard, intermetallic phase, present as precipitates limited in size and evenly distributed in the cobalt matrix. The second factor was the structure of the cobalt matrix, with dominant content of the hexagonal phase. By combining the characteristic features of the matrix and the reinforcing phase, the analyzed material gains an additional advantage, namely a higher resistance to abrasive wear.

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Section: Discussionmentioning

confidence: 99%

Comparison of the Crystal Structure and Wear Resistance of Co-Based Alloys with Low Carbon Content Manufactured by Selective Laser Sintering and Powder Injection Molding

et al. 2020

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“…The primary dendritic spacing and the average diameter of the cellular structure were both found to decrease with increasing scanning speeds. 43 Such cellular growth was reported to result in solute segregation at the cell boundaries; 21,43,[62][63] however, the extent of segregation upon Type 316L stainless steel was shown in one study, via careful atom probe tomography testing, to be near-negligible. 64 Of the studies to date, there is insufficient information available from nanoscale characterization to permit a more general understanding to emerge thus far.…”

Section: Cellular Structuresmentioning

confidence: 99%

Corrosion of Additively Manufactured Alloys: A Review

et al. 2018

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Additive manufacturing (AM), often termed 3D printing, has recently emerged as a mainstream means of producing metallic components from a variety of metallic alloys. The numerous benefits of AM include net shape manufacturing, efficient use of material, suitability to low volume production runs, and the ability to explore alloy compositions not previously accessible to conventional casting. The process of AM, which is nominally performed using laser (or electron) based local melting, has a definitive role in the resultant alloy microstructure. Herein, the corrosion of alloys prepared by AM using laser and electronbased methods, relating the corrosion performance to the microstructural features influenced by AM processing, are reviewed. Such features include unique porosity, grain structures, dislocation networks, residual stress, solute segregation, and surface roughness. Correlations between reported results and deficiencies in present understanding are highlighted.

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“…Researchers have shown that currently available TAR implants, especially the designs of talar components, fail to restore physiologic ankle mobility [15][16][17]. Selective laser melting (SLM) is a new additive manufacturing (AM) technology that can be used for fabricating complex metallic products [18]. AM or 3DP can enable careful personalization of prosthesis design for human joints according to the specific morphology of each ankle joint [12].…”

Section: Discussionmentioning

confidence: 99%

Custom-made talar component of total ankle replacement implant, with or without lateral articular facet: A finite element analysis

Zhu¹,

Tang²,

Zhang³

et al. 2020

Preprint

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Background: The present patient dissatisfaction with and high failure rates of total ankle replacement (TAR) are likely due to current prosthesis designs, which are not patient-specific and anatomy-based, leading to unphysiological motion at the replaced joint. The design of customized prostheses is already possible by means of medical imaging and additive manufacturing technology.Methods: In this study, dome and geometric fixtures of custom-made talar components for TAR were designed, and we investigated two kinds of talar components: 2-surface contact type (Type-1, without lateral articular facet) and 3-surface contact type (Type-2, with lateral articular facet). The effects of the above two prostheses on the loading stress of the prosthesis contact surface were comparatively analysed with three-dimensional finite element models.Results: The maximum and average von Mises stress values of the 3-surface prosthesis were smaller than those of the 2-surface prosthesis. In terms of contact surface pressure, the maximum and average values of the 3-surface prosthesis are almost equal to those of the 2-surface type. In terms of the tangential slip distribution of the contact surface, the maximum and average values of the 3surface prosthesis were smaller than those of the 2-surface prosthesis.Conclusions: The custom-made talar component of the total ankle replacement implant reproduced the anatomical morphology of the natural articular surfaces well. The 3-surface contact type prosthesis with lateral articular facet, compared to the 2-surface contact type without lateral articular facet, offers better static stability by affecting the internal and external forces.

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An investigation into the aging behavior of CoCrMo alloys fabricated by selective laser melting

Cited by 88 publications

References 59 publications

Comparison of the Crystal Structure and Wear Resistance of Co-Based Alloys with Low Carbon Content Manufactured by Selective Laser Sintering and Powder Injection Molding

Comparison of the Crystal Structure and Wear Resistance of Co-Based Alloys with Low Carbon Content Manufactured by Selective Laser Sintering and Powder Injection Molding

Corrosion of Additively Manufactured Alloys: A Review

Custom-made talar component of total ankle replacement implant, with or without lateral articular facet: A finite element analysis

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