Additive Manufacturing of Co-Cr-Mo Alloy: Influence of Heat Treatment on Microstructure, Tribological, and Electrochemical Properties

Mantrala, Kedar Mallik; Das, Mitun; Balla, Vamsi Krishna; Rao, Ch. Srinivasa; Rao, V.V.S. Kesava

doi:10.3389/fmech.2015.00002

Cited by 65 publications

(31 citation statements)

References 16 publications

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“…Peaks obtained from diffractometric studies with a very similar value of the 2h angle, define as a cobalt solution with Miller indexes (101), which unequivocally suggests the presence of the a solution. 39 The DTA Results…”

Section: Microstructural Analyses Of Castingsmentioning

confidence: 99%

Analysis of the Carbon Content Effect on the Microstructure and Thermal Behavior of Cobalt-Matrix Dental Alloy

et al. 2019

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The aim of the study was to consider the crystallization interval of dental CoCrMo alloys with different carbon contents as well quantitative and qualitative analysis of changes in their microstructure. The two different batches of Wironit extra-hard alloy (0.413 and 0.806% C by mass.) were tested. The chemical composition has been carried out as well as microstructure characterization (optical, scanning electron microscopy and X-ray diffraction). A quantitative and qualitative image analysis was performed. The process of differential thermal analysis was carried out in the Balzers VSG-02 vacuum induction furnace. The presence of the Co-b solution matrix and M 23 C 6 carbides was demonstrated as well as Co-a solution. Along with the change in the content of carbon in the castings, a qualitative change in the microstructure was noted. Low carbon castings are dominated by blocky eutectic-type precipitates, whereas in high carbon castings, blocky dense precipitates dominate. The results showed that the carbon content influences the crystallization parameters of the alloy (in particular increasing the T liq and decreasing the T sol with lower carbon content). It was shown that the melting point of the alloy was higher than indicated by the manufacturer (1533-1578 K). For this study, the range of 1635-1660 K was obtained. This occurrence is very disadvantageous. Using the recommended pouring temperature of 1693 K for casting the material, which usually has a carbon content of about 0.4%, a low degree of superheat is obtained, which significantly limits or even excludes the castability of the alloy.

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Section: Microstructural Analyses Of Castingsmentioning

confidence: 99%

Analysis of the Carbon Content Effect on the Microstructure and Thermal Behavior of Cobalt-Matrix Dental Alloy

et al. 2019

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“…Such internal residual stress could generate high strain and thereby affects the accuracy [36,37]. One solution to circumvent this problem is the employment of heat treatment after printing the metal that could at the same time change the micro-structure [34,38].…”

Section: Mechanical Properties Of 3d Printed Metalsmentioning

confidence: 99%

Additive Manufacturing Technologies Used for 3D Metal Printing in Dentistry

Revilla‐León

Özcan

2017

Curr Oral Health Rep

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Purpose of ReviewCompared to conventional casting methods used for processing different alloys for dental applications, additive manufacturing technologies reduce manufacturing time and costs, minimize human errors and prevent possible defects in the cast objects. This review highlights working mechanisms, possible advantages and drawbacks of recent additive manufacturing technologies used for metal processing in dentistry. Recent FindingsThe literature reviewed indicated that powder-based fusion mainly based on selective laser sintering, selective laser melting and electro beam melting are the most commonly used technologies for 3D metal printing in dentistry for dental appliances made of CoCr and Ti6Al4V. Although mechanical properties of 3D printed alloys could be considered satisfactory, accuracy and reproducibility data do not present consistent results. SummaryThere appears room for improvement between 3D printed metals and ceramic interfaces and precision before such technologies could be favoured over conventional cast methods. AbstractPurpose of Review: Compared to conventional casting methods used for processing different alloys for dental applications, additive manufacturing technologies reduce manufacturing time and costs, minimize human errors and prevent possible defects in the cast objects. This review highlights working mechanisms, possible advantages and drawbacks of recent additive manufacturing technologies used for metal processing in dentistry. Recent Findings: The literature reviewed indicated that powder based fusion mainly based on selective laser sintering, selective laser melting and electro beam melting are the most commonly used technologies for 3D metal printing in dentistry for dental appliances made of CoCr and Ti6Al4V. Although mechanical properties of 3D printed alloys could be considered satisfactory, accuracy and reproducibility data do not present consistent results. Summary: There appears room for improvement between 3D printed metals and ceramic interfaces and precision before such technologies could be favoured over conventional cast methods.

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“…However, in general, lower the I corr and nobler the E corr better will be the corrosion resistance of a material. Therefore, to identify the surface for best corrosion performance Gray relational grade analysis, 29,30 which combine multiple responses into a single index, was performed using I corr and E corr data of LSM samples only. The analysis showed that the corrosion performance of LSM samples processed at 5 mm/s will be best among the samples in polished condition.…”

Section: Corrosion Performancementioning

confidence: 99%

Laser surface modification of 316L stainless steel

et al. 2017

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Medical grade 316L stainless steel was laser surface melted (LSM) using continuous wave Nd-YAG laser in argon atmosphere at 1 and 5 mm/s. The treated surfaces were characterized using electron backscatter diffraction to study the influence of top surface crystallographic orientation and type of grain boundaries on corrosion resistance, wettability, and biocompatibility. The laser scan velocity was found to have a marginal influence on the surface roughness and the type of grain boundaries. However, the crystal orientation density was found to be relatively high in 1 mm/s samples. The LSM samples showed a higher concentration of {101} and {123} planes parallel to the sample surface as well as a higher fraction of low-angle grain boundaries. The LSM samples were found to exhibit better surface wettability and enhanced the viability and proliferation of human fetal osteoblast cells in vitro when compared to the untreated samples. Further, the corrosion protection efficiency of 316L stainless steel was improved up to 70% by LSM in as-processed condition. The increased concentration of {101} and {123} planes on surfaces of LSM samples increases their surface energy, which is believed to be responsible for the improved in vitro cell proliferation. Further, the increased lattice spacing of these planes and high concentration of low-energy grain boundaries in LSM samples would have contributed to the better in vitro corrosion resistance than untreated 316L stainless steel. Our results indicate that LSM can be a potential treatment option for 316L stainless steel-based biomedical devices to improve biocompatibility and corrosion resistance. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 569-577, 2018.

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Additive Manufacturing of Co-Cr-Mo Alloy: Influence of Heat Treatment on Microstructure, Tribological, and Electrochemical Properties

Cited by 65 publications

References 16 publications

Analysis of the Carbon Content Effect on the Microstructure and Thermal Behavior of Cobalt-Matrix Dental Alloy

Analysis of the Carbon Content Effect on the Microstructure and Thermal Behavior of Cobalt-Matrix Dental Alloy

Additive Manufacturing Technologies Used for 3D Metal Printing in Dentistry

Laser surface modification of 316L stainless steel

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