Microstructure and Tribological Properties of Plasma Nitriding Cast CoCrMo Alloy

Wang, Qingliang; Huang, Chuanhui; Zhang, Lei

doi:10.1016/s1005-0302(12)60024-3

Cited by 31 publications

(14 citation statements)

References 18 publications

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“…where w is wear, m i initial mass of the sample and m f sample mass after test (after 30 minutes). After each test, for a better accuracy of the results, all the samples were cleaned in an ultrasonic bath of alcohol before weighed Wang [8]. In figure 5, the evolution in time of the wear, for the thermo-mechanically treated and oil-quenched samples of HS2-9-1-8 high-speed steel is shown.…”

Section: Resultsmentioning

confidence: 99%

Thermomechanical Treatment Influence on the High-speed Steel Hardness and Wear

Catana¹

2015

ujms

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Thermomechanical treatment consists in using two classic manufacturing methods. This type of treatment was applied to studied high-speed steel (HS2-9-1-8). The tests performed aimed to establish the influence on the hardness and wear of the high-temperature thermomechanical treatment (HTTMT) applied to studied steel. The application of an additional plastic deformation (the deformation degree between 45-75%) positively influences the hardness and wear value. Being a HTTMT, the plastic deformation was followed by quenching, the utilized agent being the oil or compressed air. When the quenching agent was the oil the hardness increased by 6-7% and the wear diminished up to 40%. Samples thermally treated in the classical way were used as comparison elements. The study performed shows that a favourable evolution of the analysed properties appears when the deformation degree is between 55 and 75%. The air compressed quenching sets for the analysed characteristics, the same evolution with those obtained during the oil quenching. The increased hardness for the studied high-speed steel utilized at cutting tools manufacturing will generate a slower wear of the cutting edge that means important economies in cutting process.

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Section: Resultsmentioning

confidence: 99%

Thermomechanical Treatment Influence on the High-speed Steel Hardness and Wear

Catana¹

2015

ujms

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“…Wear rate is commonly calculated using two main formulas, based either on weight loss [14] or volume loss [15] k= ΔV/FS (eqn. (1)), where k is the wear rate coefficient, ΔV wear volume loss, F the normal load, and S the total sliding distance.…”

Section: Wear Ratementioning

confidence: 99%

The use of nitriding to enhance wear resistance of cast irons

Yang

Northwood

Sun³

et al. 2013

WIT Transactions on Engineering Sciences

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This research is focused on using nitriding to enhance the wear resistance of austempered ductile iron (ADI), ductile iron (DI), and gray iron (GI). Three gas nitriding processes, namely "Gas nitriding + nitrogen cooled down to 800 o F" (Blue), "Gas nitriding + cooled down to 300 o F" (Gray), and "Gas nitriding + oil quenched" (Oil) were used. This study was carried out through optical metallography, roughness measurements, microhardness, and SEM. The ball-ondisc wear tests were conducted under lubricated conditions. It was found that COF for all materials in all nitrided conditions was small (<0.045). The best wear performance was seen for ADI processed using the Gray and Oil gas nitriding processes. These processes produced a compound layer thickness of 4-6μm, a low surface roughness (0.8-1.3 μm, Ra) and a high surface microhardness (1800-2200 HV). The wear rate decreased with increasing surface microhardness and decreasing surface roughness.

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“…Recently, alloys with high content of tungsten instead molybdenum have been developed aiming a better ceramicmetal adhesion (10). On the other hand, the CoCrMo alloys have been more studied (4-12) than CoCrW alloys (13,14).…”

Section: Introductionmentioning

confidence: 99%

In Vitro Cytotoxicity Test and Surface Characterization of CoCrW Alloy in Artificial Saliva Solution for Dental Applications

et al. 2016

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In order to evaluate its application as a dental prosthesis material, a CoCrW alloy was subjected to in vitro cytotoxicity test, surface characterization and electrochemical studies performed in artificial saliva and 0.15 mol.L -1 NaCl medium. The used techniques were: anodic polarization curves, chronoamperometric measurements, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) analysis and X-ray photoelectron spectroscopy (XPS). Cytotoxicity test was also performed. The electrochemical behavior of CoCrW alloy was compared in both studied media, from corrosion potential (E corr ) to a 600 mV anodic overvoltage. From the electrochemical measurements it was observed that the CoCrW alloy in both media presents only generalized corrosion. SEM and EDS analysis showed that the alloy presents carbide niobium and silicon and manganese oxides as nonmetallic inclusions. XPS results indicated that cobalt does not significantly contribute to the passivating film formation. Cytotoxicity test showed no cytotoxic character of CoCrW alloy. These results suggest that the CoCrW alloy can be used as biomaterial to be applied as prosthesis in dental implants. In Vitro Cytotoxicity Test and S u r f a c e C h a r a c t e r i z a t i o n o f

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Microstructure and Tribological Properties of Plasma Nitriding Cast CoCrMo Alloy

Cited by 31 publications

References 18 publications

Thermomechanical Treatment Influence on the High-speed Steel Hardness and Wear

Thermomechanical Treatment Influence on the High-speed Steel Hardness and Wear

The use of nitriding to enhance wear resistance of cast irons

In Vitro Cytotoxicity Test and Surface Characterization of CoCrW Alloy in Artificial Saliva Solution for Dental Applications

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