Machining of Cobalt Chromium Molybdenum (CoCrMo) Alloys: A Review

Saravanan, R.; Hamidon, R.; Murad, Nour; Zailani, Z. A.

doi:10.1007/978-981-16-0866-7_36

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…The randomness in physical orientation of the columnar grains within the melt pool can be realized from the EBSD IPF maps (Figure 2d,e) where the sections of columnar grains in region 2 appeared to be equiaxed (Figure 2d), as they were oriented perpendicular to the YZ plane, while, a neighboring region 3 revealed the columnar grains with their major axes oriented parallel along the YZ plane (Figure 2e). The significantly lower thermal conductivity of CoCrMo, ≈13 W mK [ 35 ] (whereas, that of aluminum alloy 360: ≈150 W mK, magnesium alloy AZ31B: ≈100 W mK, and steel‐wrought carbon: ≈59 W mK, for comparison [ 36 ] ) leads to the development of thermal gradients of lower magnitudes during L‐DED processing. Such lower magnitude of thermal gradient tends to marginally influence the specific crystallographic textures and the physical orientations of the grains.…”

Section: Resultsmentioning

confidence: 99%

Thermokinetically Driven Microstructural Evolution in Laser‐Based Directed Energy‐Deposited CoCrMo Biomedical Alloy

et al. 2022

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The present work investigated additive manufacturing of CoCrMo alloy via laser‐based directed energy deposition process. A range of five different laser powers are used for the fabrication of fully dense and metallurgically sound CoCrMo samples. The solidification parameters including temperature gradient, growth rate, and the cooling rate are computationally predicted in each case, using a multitrack multilayer model. The variation in these computationally predicted solidification parameters with the different laser powers used in fabrication is linked to the evolution of microstructural features within the laser additively deposited CoCrMo samples. Evolution of ε‐hexagonally close‐packed (HCP) martensites from γ‐face‐centered cubic (FCC) phase, along with variation in thickness of these martensitic laths with respect to the varying solidification parameters associated with the laser additive deposition, is identified and investigated. The multitrack, multilayer thermokinetic model not only provides the spatial and temporal signatures of laser‐based directed energy deposited process, but uniquely considers the influence of pre‐ and postheating on microstructural evolution with their correlation with experimental observations.

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Section: Resultsmentioning

confidence: 99%

Thermokinetically Driven Microstructural Evolution in Laser‐Based Directed Energy‐Deposited CoCrMo Biomedical Alloy

et al. 2022

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“…CoCrMo alloys are classified as hard-to-cut materials because they have several characteristics, such as high hardness, low thermal conductivity, high wear resistance, and strain hardening, that contribute to poor machinability. Although this alloy is similar to a titanium alloy in terms of its properties, research on the mechanical processing of CoCrMo alloys is still insufficient [3]. It should be noted that in work [7], in addition to the different chemical composition among the specified alloys, they were produced by four different methods: cast, milled, SLM and SLS.…”

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confidence: 99%

Analysis of the Experience of Manufacturing Metal Stents from Different Alloys Using Traditional and Additive Technologies

Adzhamskyi,

Kononenko,

Podolskyi

et al. 2023

Materials Science and Surface Engineering

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Metal stents of the first generation were made of 316L steel, this material became widely used. Over time, they mastered the production of second-generation stents from the Ti6Al4V alloy, the latest generation products are made from CoCrMo glory. In recent decades, additive manufacturing methods (SLM and SLS) have made it possible to achieve high product quality and found their application, including in the manufacture of stents. A comparative analysis of the chemical composition and mechanical properties of the specified alloys and studies on the cytotoxicity of these materials made by casting, mechanical processing (milling), SLM and SLS were performed. It is shown that biological aspects and mechanical properties in laboratory conditions are influenced by the choice of production technology, heat treatment and microstructure of materials.

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CAD, Laser Powder Bed Fusion Fabrication and Post-processing of Customized Metal Dental Products

Lesyk

Lymar

Dzhemelinskyi

et al. 2023

Lecture Notes in Mechanical Engineering

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Machining of Cobalt Chromium Molybdenum (CoCrMo) Alloys: A Review

Cited by 8 publications

References 30 publications

Thermokinetically Driven Microstructural Evolution in Laser‐Based Directed Energy‐Deposited CoCrMo Biomedical Alloy

Thermokinetically Driven Microstructural Evolution in Laser‐Based Directed Energy‐Deposited CoCrMo Biomedical Alloy

Analysis of the Experience of Manufacturing Metal Stents from Different Alloys Using Traditional and Additive Technologies

CAD, Laser Powder Bed Fusion Fabrication and Post-processing of Customized Metal Dental Products

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