Laser-deposited CoCrMo alloy: Microstructure, wear, and electrochemical properties

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

doi:10.1557/jmr.2014.163

Cited by 43 publications

(16 citation statements)

References 19 publications

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“…Preliminary investigation on the corrosion characteristics of SLM CoCrW and DLD CoCrMo alloys were reported by Lu, et al, 137 and Mantrala, et al, 138 respectively. Both studies intended to correlate the laser parameters utilized in each manufacturing process with corrosion performance.…”

Section: Titanium Alloysmentioning

confidence: 97%

“…The findings from such studies are summarized in Table 7. [133][134][135][136][137][138][139][140][141][142][143][144][145][146][147][148] In the case of CoCr, Xin, et al, 133 investigated the corrosion characteristics of SLM CoCr in artificial saliva solution-due to the applicability of CoCr-based alloys in odontology-and compared the results with a cast counterpart. The SLM CoCr (i corr = 0.02 μA/cm 2 ) exhibited similar corrosion characteristics to cast (i corr = 0.07 μA/cm 2 ) from potentiodynamic polarization in the analyzed environment.…”

Section: Titanium Alloysmentioning

confidence: 99%

“…The SLM CoCrW sample produced with laser scan speed of 300 mm/s showed an i corr of 17.4 nA/cm 2 , and a significant increase of i corr was measured for the sample produced with laser scan speed of 1,500 mm/s (70.8 nA/cm 2 ). Mantrala, et al, 138 reported that 200 W laser power with a 10 mm/s laser scan speed at 5 g/min powder feed rate was optimal to produce DLD CoCrMo resistant to corrosion in 3.5 wt% NaCl with i corr of 0.013 μA/cm 2 .…”

Section: Titanium Alloysmentioning

confidence: 99%

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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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Section: Titanium Alloysmentioning

confidence: 97%

Section: Titanium Alloysmentioning

confidence: 99%

Section: Titanium Alloysmentioning

confidence: 99%

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Corrosion of Additively Manufactured Alloys: A Review

et al. 2018

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“…Increased hardness of CoCrMo due to the laser-induced fine and homogenous microstructure has been reported by a number of authors [18,19,23,24]. Since no nitride was detected in XRD, the possibility of hardness increment due to the nitride formation can be ruled out.…”

Section: Surface Phase Structure Analysismentioning

confidence: 89%

“…The CoCrMo parts created by the SLM process exhibited superior hardness than those produced by conventional manufacturing processes (e.g., casting, electron beam melting and forging). Mantrala et al created a CoCrMo layer using the laser-engineered net shaping (LENS) technique [24]. They reported that the microstructural features, as well as the hardness and wear properties strongly depended on the laser processing parameters.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study to Enhance the Tribological Performance of CoCrMo Alloy by Fibre Laser Remelting for Articular Joint Implant Applications

2018

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Abstract:CoCrMo alloy has long been used as a pairing femoral head material for articular joint implant applications because of its biocompatibility and reliable tribological performance. However, friction and wear issues are still present for CoCrMo (metal)/CoCrMo (metal) or CoCrMo (metal)/ultrahigh molecular weight polyethylene (UHMWPE) (plastic) pairs in clinical observations. The particulate wear debris generated from the worn surfaces of CoCrMo or UHMWPE can pose a severe threat to human tissues, eventually resulting in the failure of implants and the need for revision surgeries. As a result, a further improvement in tribological properties of this alloy is still needed, and it is of great interest to both the implant manufacturers and clinical surgeons. In this study, the surface of CoCrMo alloy was laser-treated by a fibre laser system in an open-air condition (i.e., no gas chamber required). The CoCrMo surfaces before and after laser remelting were analysed and characterised by a range of mechanical tests (i.e., surface roughness measurement and Vickers micro-hardness test) and microstructural analysis (i.e., XRD phase detection). The tribological properties were assessed by pin-on-disk tribometry and dynamic light scattering (DLS). Our results indicate that the laser-treated surfaces demonstrated a friction-reducing effect for all the tribopairs (i.e., CoCrMo against CoCrMo and CoCrMo against UHHMWPE) and enhanced wear resistance for the CoCrMo/CoCrMo pair. Such beneficial effects are chiefly attributable to the presence of the laser-formed hard coating on the surface. Laser remelting possesses several competitive advantages of being a clean, non-contact, fast, highly accurate and automated process compared to other surface coating methods. The promising results of this study point to the possibility that laser remelting can be a practical and effective surface modification technique to further improve the tribological performance of CoCr-based orthopaedic implants.

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Physical and Chemical Behavior and Powder Effects

2024

Metallic Powders for Additive Manufacturing

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Laser-deposited CoCrMo alloy: Microstructure, wear, and electrochemical properties

Abstract: Abstract

Cited by 43 publications

References 19 publications

Corrosion of Additively Manufactured Alloys: A Review

Corrosion of Additively Manufactured Alloys: A Review

A Preliminary Study to Enhance the Tribological Performance of CoCrMo Alloy by Fibre Laser Remelting for Articular Joint Implant Applications

Physical and Chemical Behavior and Powder Effects

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